Technical guide2.1 MB - Viessmann

VIESMANN
Oil/gas boilers
90 to 2000 kW
Technical guide
Design and operating information for hot water boilers up to
110 ºC to EN 12828, or up to 120 ºC to EN 12953
VITOPLEX 200 Type SX2A
VITOPLEX 300 Type TX3A
VITORADIAL 300-T Type VR3
VITOROND 200 Type VD2A
VITOROND 200 Type VD2
5822 426 GB 5/2010

Index
Index
1. Vitoplex 200, type SX2A, 90 to
560 kW
2. Vitoplex 200, type SX2A, 700 to
1950 kW
3. Vitoplex 300, type TX3A, 90 to
500 kW
4. Vitoplex 300, type TX3A, 620 to
2000 kW
5. Vitoradial 300-T, type VR3, 101 to
335 kW
6. Vitorond 200, type VD2A, 125 to
270 kW
7. Vitorond 200, type VD2, 320 to
1080 kW
1. 1 Product description ................................................................................................... 5
1. 2 Operating conditions with Vitotronic boiler control units and Therm-Control ............ 5
2. 1 Product description ................................................................................................... 6
2. 2 Operating conditions with Vitotronic boiler control units ........................................... 6
3. 1 Product description ................................................................................................... 7
3. 2 Operating conditions with Vitotronic boiler control units and Therm-Control ............ 7
4. 1 Product description ................................................................................................... 8
4. 2 Operating conditions with Vitotronic boiler control units and Therm-Control ............ 8
5. 1 Product description ................................................................................................... 9
5. 2 Operating conditions with Vitotronic boiler control units and Therm-Control ............ 9
6. 1 Product description ................................................................................................... 10
6. 2 Operating conditions with Vitotronic boiler control units and Therm-Control ............ 10
7. 1 Product description ................................................................................................... 11
7. 2 Operating conditions with Vitotronic boiler control units ........................................... 11
8. Burner 8. 1 Specification, Vitoflame 100, type VEH III ................................................................ 12
8. 2 Specification, Vitoflame 100, type VG III .................................................................. 15
9. Installation accessories 9. 1 Specification ............................................................................................................. 19
■ Accessories for heating circuits ............................................................................ 19
10. Design information 10. 1 Delivery, handling and installation ............................................................................ 27
■ Delivery ................................................................................................................. 27
■ Handling and positioning ....................................................................................... 27
■ Installation room .................................................................................................... 27
■ Load-bearing boiler cover ..................................................................................... 28
10. 2 System design .......................................................................................................... 28
■ Flow temperatures ................................................................................................ 28
■ Safety temperatures .............................................................................................. 28
■ Selection of rated output ....................................................................................... 28
■ Requirements through heat load ........................................................................... 28
■ Pump-controlled pressure maintaining systems ................................................... 29
10. 3 Water connection ...................................................................................................... 29
■ Heating connections ............................................................................................. 29
■ Boiler circuit and shunt pumps .............................................................................. 29
■ System accessories .............................................................................................. 29
■ Sample applications .............................................................................................. 30
10. 4 Safety equipment ...................................................................................................... 30
■ General information .............................................................................................. 31
■ Safety accessories selection table ........................................................................ 31
10. 5 Fuel ........................................................................................................................... 31
10. 6 Burners ..................................................................................................................... 32
■ Suitable burners .................................................................................................... 32
■ Burner installation ................................................................................................. 32
■ Burner settings ...................................................................................................... 32
10. 7 Flue gas routing ........................................................................................................ 32
■ Requirements in accordance with the Sample Combustion Order [Germany] ..... 32
■ Sizing the flue system ........................................................................................... 33
■ Chimney diagrams ................................................................................................ 33
■ Flue system for condensing boilers ...................................................................... 35
■ Flue system installation options for the Vitoradial 300-T ...................................... 35
■ Flue system for the Vitoradial 300-T ..................................................................... 35
■ CE designation for the PPs flue gas systems for the Vitoradial 300-T ................. 37
■ Open flue operation with the Vitoradial 300-T ....................................................... 38
■ Individual components of the plastic flue system .................................................. 38
■ Connecting a plastic flue pipe (PPs) to a moisture-resistant chimney (MR chimney,
negative pressure) ................................................................................................ 43
10. 8 Sound insulation ....................................................................................................... 44
■ Attenuating airborne noise .................................................................................... 44
■ Attenuating structure-borne noise ......................................................................... 44
■ Noise attenuating accessories .............................................................................. 44
2 VIESMANN OIL/GAS BOILERS
5822 426 GB

Index (cont.)
10. 9 Standard values for water quality ............................................................................. 44
■ Heating systems with rated operating temperatures up to 100 ºC (VDI 2035) ..... 44
■ Heating systems with permissible flow temperatures in excess of 100 ºC (VdTÜV
DS 1466) ............................................................................................................... 45
■ Using antifreeze in boilers ..................................................................................... 46
■ Prevention of damage through corrosion on the water side ................................. 47
10.10 Vitotrans 300 flue gas/water heat exchanger ........................................................... 47
■ Downstream installation of a Vitotrans 300 flue gas/water heat exchanger for raising
the efficiency ................................................................................................... 47
■ Energy savings from using a Vitotrans 300 flue gas/water heat exchanger in conjunction
with Vitoplex and Vitorond boilers ........................................................... 47
■ Calculation of possible energy savings (B E ) ........................................................ 48
■ Hydraulic connection ............................................................................................. 48
■ Condensate and neutralisation ............................................................................. 49
■ Positioning the neutralising system ....................................................................... 49
11. Control units 11. 1 Overview of boiler control units and control panels .................................................. 49
■ Single boiler systems ............................................................................................ 50
■ Multi-boiler systems .............................................................................................. 51
■ Switching points .................................................................................................... 53
11. 2 Components in the delivered condition ..................................................................... 53
■ Allocation to control unit types .............................................................................. 53
■ Boiler water temperature sensor ........................................................................... 54
■ Cylinder temperature sensor ................................................................................. 54
■ Outside temperature sensor ................................................................................. 54
11. 3 Vitotronic 100, type GC1, part no. 7248 083 ............................................................ 54
■ Specification .......................................................................................................... 54
■ Delivered condition ............................................................................................... 56
11. 4 Vitotronic 200, type GW1, part no. 7248 084 ............................................................ 56
■ Specification .......................................................................................................... 56
■ Delivered condition ............................................................................................... 58
11. 5 Vitotronic 300, type GW2, part no. 7248 085 ............................................................ 58
■ Specification .......................................................................................................... 58
■ Delivered condition ............................................................................................... 60
11. 6 Vitotronic 300-K, type MW1, part no. 7248 233 ........................................................ 60
■ Specification .......................................................................................................... 60
■ Delivered condition ............................................................................................... 61
11. 7 Control unit accessories ........................................................................................... 62
■ Allocation of accessories according to control unit type ....................................... 62
■ Extension kit for one heating circuit with mixer ..................................................... 62
■ Mixer motor for flanged mixers ............................................................................. 63
■ Plug sÖ ................................................................................................................. 63
■ Plug gS ................................................................................................................. 63
■ Plugs for sensors .................................................................................................. 63
■ Contact temperature sensor ................................................................................. 63
■ Immersion temperature sensor ............................................................................. 64
■ Immersion thermostat ........................................................................................... 64
■ Contact thermostat ................................................................................................ 64
■ Information regarding the Vitotrol 200 and 300 ..................................................... 64
■ Vitotrol 200 ............................................................................................................ 65
■ Vitotrol 300 ............................................................................................................ 65
■ Room temperature sensor .................................................................................... 66
■ Flue gas temperature sensor ................................................................................ 66
■ Radio clock receiver .............................................................................................. 66
■ Plug-in adaptor for external safety equipment ...................................................... 67
■ Function extension 0–10 V ................................................................................... 67
■ Functions in connection with the function extension 0 – 10 V (accessory) ........... 68
■ Cylinder temperature sensor ................................................................................. 68
■ Sensor well ........................................................................................................... 69
■ Contactor relay ...................................................................................................... 69
■ Mating plugs fA and lÖ ....................................................................................... 69
■ LON communication module ................................................................................. 69
■ LON connecting cable for data exchange between control units .......................... 69
■ Extension of the connecting cable ........................................................................ 70
■ Terminator (2 pce.) ............................................................................................... 70
5822 426 GB
OIL/GAS BOILERS VIESMANN 3

Index (cont.)
11. 8 On site connections .................................................................................................. 70
■ Auxiliary functions for single boiler systems with the Vitotronic 200, type GW1 or
Vitotronic 300, type GW2 ...................................................................................... 70
■ Auxiliary functions for multi-boiler systems with the Vitotronic 300-K and Vitotronic
100, type GC1 via LON ......................................................................................... 71
■ Connection to on-site control units to the Vitotronic 100, type GC1 in single boiler
systems ................................................................................................................. 72
■ Boiler sequence control with on-site cascade controller — Connections to the
Vitotronic 100, type GC1 ....................................................................................... 73
■ Hook-up of on-site control equipment via LON ..................................................... 74
12. Appendix 12. 1 Safety regulations and requirements ........................................................................ 75
■ Notification and required permits .......................................................................... 75
■ Permit requirement and testing to the Health & Safety at Work Act (BetrSichV)
[Germany] ............................................................................................................. 75
■ General information regarding low pressure hot water boilers with safety temperatures
of up to 110/120 ºC .................................................................................... 75
■ Gas installation ..................................................................................................... 76
■ Pipe connections ................................................................................................... 76
■ Electrical installation ............................................................................................. 76
■ Operating instructions ........................................................................................... 76
■ Flue system ........................................................................................................... 76
■ Energy Saving Ordinance (EnEV) ........................................................................ 76
■ German Immissions Order (BImSchV) ................................................................. 76
■ Checks as part of the Building Regulations approval process .............................. 77
13. Keyword index .............................................................................................................................................. 78
5822 426 GB
4 VIESMANN OIL/GAS BOILERS

Vitoplex 200, type SX2A, 90 to 560 kW
1.1 Product description
Low temperature oil/gas boiler
For operation with modulating boiler water temperature
Permissible flow temperature (= safety temperature) up to 110 ºC (up
to 120 °C on request)
Permissible operating pressure 4 bar
■ CE designation: CE-0085BQ0020
– according to Efficiency Directive 92/42/EEC (up to 350 kW)
– according to Gas Appliances Directive 2009/142/EC
■ Economical and environmentally friendly through modulating boiler
water temperature.
Standard seasonal efficiency [to DIN] for operation with fuel oil:
89 % (H s )/95 % (H i ).
■ Optional stainless steel flue gas/water heat exchanger for higher
standard seasonal efficiency [to DIN] through condensing technology.
■ Three-pass boiler with low combustion chamber loading for clean
combustion with low emissions.
■ Wide water galleries and large water content provide excellent natural
circulation and safe heat transfer.
■ Integral Therm-Control start-up system for easy hydraulic connections
– a shunt pump and a return temperature raising facility are not
required.
■ Low water indicators are not required up to 300 kW.
■ Compact design for easy transportation and economical use of
space – important for modernisation projects.
■ Vitoflame 100 to 270 kW Unit pressure-jet oil/gas burners are available.
■ Fastfix assembly system for control unit and thermal insulation.
1
1.2 Operating conditions with Vitotronic boiler control units and Therm-Control
Requirements
Operation with burner load ≥ 60 % < 60 %
1. Heating water flow rate None
2. Boiler return temperature (minimum value) *1 None *2
3. Low-end boiler water temperature – Oil operation 50 °C – Oil operation 60 °C
– Gas operation 60 °C – Gas operation 65 °C
4. Two-stage burner operation Stage 1; 60 % of rated output No minimum load required
5. Modulating burner operation Between 60 and 100 % of rated output No minimum load required
6. Reduced mode Single boiler systems and lead boiler of multi-boiler systems
– Operation with the low-end boiler water temperature
Lag boilers of multi-boiler systems
– Can be shut down
7. Weekend setback As per reduced mode
Note
For water quality requirements, see page 44.
5822 426 GB
*1 For a corresponding sample application using the Therm-Control start-up system, see technical guide sample applications.
*2 No requirements only in conjunction with Therm-Control.
OIL/GAS BOILERS VIESMANN 5

2
Vitoplex 200, type SX2A, 700 to 1950 kW
2.1 Product description
Low temperature oil/gas boiler
Three-pass boiler
For operation with modulating boiler water temperature
Permissible flow temperature (= safety temperature) up to 110 °C (up
to 120 °C on request)
Permissible operating pressure 6 bar
■ CE designation: CE-0085BQ0020
– according to Gas Appliances Directive 2009/142/EC
■ Economical and environmentally friendly through modulating boiler
water temperature.
Standard seasonal efficiency [to DIN] for operation with fuel oil:
89 % (H s )/95 % (H i ).
■ Optional stainless steel flue gas/water heat exchanger for higher
standard seasonal efficiency [to DIN] through condensing technology.
■ Three-pass boiler with low combustion chamber loading, resulting in
clean combustion with low emissions.
■ Wide water galleries and large water content provide excellent natural
circulation and safe heat transfer.
■ Long burner runtimes and fewer cycle intervals, due to large water
content, protect the environment.
■ Compact design for easy transportation – important for modernisation
projects.
■ Economical and safe operation of the heating system through the
digital Vitotronic control system with communication capability.
Standardised LON for complete integration into building management
systems.
2.2 Operating conditions with Vitotronic boiler control units
Requirements
Operation with burner load ≥ 60 % < 60 %
1. Heating water flow rate None
2. Boiler return temperature (minimum value) *3 – Oil operation 40 °C – Oil operation 53 °C
– Gas operation 53 °C – Gas operation 58 °C
3. Low-end boiler water temperature – Oil operation 50 °C – Oil operation 60 °C
– Gas operation 60 °C – Gas operation 65 °C
4. Two-stage burner operation Stage 1; 60 % of rated output No minimum load required
5. Modulating burner operation Between 60 and 100 % of rated output No minimum load required
6. Reduced mode Single boiler systems and lead boiler of multi-boiler systems
– Operation with the low-end boiler water temperature
Lag boilers of multi-boiler systems
– Can be shut down
7. Weekend setback As per reduced mode
Note
For water quality requirements, see page 44.
*3 For sample applications, see technical guide sample applications.
5822 426 GB
6 VIESMANN OIL/GAS BOILERS

Vitoplex 300, type TX3A, 90 to 500 kW
3.1 Product description
Low temperature oil/gas boiler
Three-pass boiler with multi-layered convection heating surfaces
For operation with a modulating boiler water temperature
Permissible flow temperature (= safety temperature) up to 110 ºC (up
to 120 °C on request)
Permissible operating pressure 4 bar
■ CE designation: CE-0085BT0478
– according to Efficiency Directive 92/42/EEC (up to 390 kW)
– according to Gas Appliances Directive 2009/142/EC
■ Multi-layered convection heating surfaces for high operational reliability
and a long service life.
■ Standard seasonal efficiency [to DIN] for operation with fuel oil:
90 % (H s )/96 % (H i ).
■ Optional stainless steel flue gas/water heat exchanger for higher
standard seasonal efficiency [to DIN] through condensing technology.
■ Three-pass boiler with low combustion chamber loading, resulting in
clean combustion with low emissions.
■ Wide water galleries and large water content provide excellent natural
circulation and safe heat transfer.
■ The integral Therm-Control start-up system replaces the shunt pump
or constant raising of the return temperature, thereby saving installation
time and costs.
■ Economical and safe operation of the heating system through the
digital Vitotronic control system with communication capability.
Standardised LON BUS for complete integration into building management
systems.
3.2 Operating conditions with Vitotronic boiler control units and Therm-Control
3
Requirements
Operation with burner load ≥ 60 % < 60 %
1. Heating water flow rate None
2. Boiler return temperature (minimum value) *1 None *2
3. Low-end boiler water temperature – Oil operation 40 °C – Oil operation 50 °C
– Gas operation 50 °C – Gas operation 60 °C
4. Two-stage burner operation Stage 1; 60 % of rated output No minimum load required
5. Modulating burner operation Between 60 and 100 % of rated output No minimum load required
6. Reduced mode Single boiler systems and lead boiler of multi-boiler systems
– Operation with the low-end boiler water temperature
Lag boilers of multi-boiler systems
– Can be shut down
7. Weekend setback As per reduced mode
Note
For water quality requirements, see page 44.
5822 426 GB
*1 For a corresponding sample application using the Therm-Control start-up system, see technical guide sample applications.
*2 No requirements only in conjunction with Therm-Control.
OIL/GAS BOILERS VIESMANN 7

Vitoplex 300, type TX3A, 620 to 2000 kW
4.1 Product description
Low temperature oil/gas boiler
Three-pass boiler with multi-layered convection heating surfaces
For operation with a modulating boiler water temperature
Permissible flow temperature (= safety temperature) up to 110 ºC (up
to 120 °C on request)
Permissible operating pressure 6 bar
■ CE designation: CE-0085BT0478
– according to Gas Appliances Directive 2009/142/EC
■ Multi-layered convection heating surfaces for high operational reliability
and a long service life.
■ Standard seasonal efficiency [to DIN] for operation with fuel oil:
90 % (H s )/96 % (H i ).
■ Optional stainless steel flue gas/water heat exchanger for higher
standard seasonal efficiency [to DIN] through condensing technology.
■ Three-pass boiler with low combustion chamber loading, resulting in
clean combustion with low emissions.
■ Wide water galleries and large water content provide excellent natural
circulation and safe heat transfer.
■ The integral Therm-Control start-up system replaces the shunt pump
or constant raising of the return temperature, thereby saving installation
time and costs.
■ Fastfix assembly system for rapid and simple installation.
■ With walk-on boiler cover – for easier installation and maintenance.
■ Economical and safe operation of the heating system through the
digital Vitotronic control system with communication capability.
Standardised LON BUS for complete integration into building management
systems.
4.2 Operating conditions with Vitotronic boiler control units and Therm-Control
4
Requirements
Operation with burner load ≥ 60 % < 60 %
1. Heating water flow rate None
2. Boiler return temperature (minimum value) *1 None *2
3. Low-end boiler water temperature – Oil operation 40 °C – Oil operation 50 °C
– Gas operation 50 °C – Gas operation 60 °C
4. Two-stage burner operation Stage 1; 60 % of rated output No minimum load required
5. Modulating burner operation Between 60 and 100 % of rated output No minimum load required
6. Reduced mode The boiler can be switched OFF if no heat is required.
7. Weekend setback As per reduced mode
Note
For water quality requirements, see page 44.
*1 For a corresponding sample application using the Therm-Control start-up system, see technical guide sample applications.
*2 No requirements only in conjunction with Therm-Control.
5822 426 GB
8 VIESMANN OIL/GAS BOILERS

Vitoradial 300-T, type VR3, 101 to 335 kW
5.1 Product description
Low temperature boiler with oil/gas condensing heat exchanger
Three-pass boiler with multi-layered convection heating surfaces
and downstream Inox-Radial spiral heat exchanger
For operation with a modulating boiler water temperature
Permissible flow temperature (= safety temperature) up to 110 ºC
Permissible operating pressure 4 bar
■ CE designation: CE-0035BU104
– according to the Efficiency Directive 92/42/EEC
– according to Gas Appliances Directive 2009/142/EC
■ Oil Unit condensing boiler with Vitoflame 100 pressure-jet oil burner
or gas condensing system with on-site burner.
■ Standard seasonal efficiency [to DIN] for operation with fuel oil: 97
% (H s )/103 % (H i ).
■ Inox-Radial heat exchanger for condensing hot gases, matched to
the compact boiler.
■ Complete with heat exchanger pipework and pump, matched to the
respective boiler output.
■ Long burner runtimes and fewer cycle intervals, due to large water
content, protect the environment.
■ Economical and safe operation of heating systems through the digital
Vitotronic control system with communication capability.
■ Integral Therm-Control start-up system for easy hydraulic connection
– no shunt pump or return temperature raising facility are
required.
■ No low water indicator required, you save even more.
■ Compact design for easy transportation and low build height – important
for modernisation projects.
5.2 Operating conditions with Vitotronic boiler control units and Therm-Control
Requirements
Operation with burner load ≥ 60 % < 60 %
1. Heating water flow rate None
2. Boiler return temperature (minimum value) *1 None *2
3. Low-end boiler water temperature – Oil operation 40 °C
– Gas operation 50 °C
– Oil operation 50 °C
– Gas operation 60 °C
4. Two-stage burner operation Stage 1; 60 % of rated output No minimum load required
5. Modulating burner operation Between 60 and 100 % of rated output No minimum load required
6. Reduced mode The boiler can be switched OFF if no heat is required.
7. Weekend setback As per reduced mode
Note
For water quality requirements, see page 44.
5
5822 426 GB
*1 For a corresponding sample application using the Therm-Control start-up system, see technical guide sample applications.
*2 No requirements only in conjunction with Therm-Control.
OIL/GAS BOILERS VIESMANN 9

Vitorond 200, type VD2A, 125 to 270 kW
6.1 Product description
Low temperature oil/gas boiler
Three-pass boiler as cast iron sectional design (available as a block
or in individual sections)
For operation with modulating boiler water temperature
Permissible flow temperature (= safety temperature) up to 110 °C
Permissible operating pressure 6 bar
■ CE designation: CE-0085BS0005
– according to the Efficiency Directive 92/42/EEC
– according to Gas Appliances Directive 2009/142/EC
■ Economical and environmentally friendly through modulating boiler
water temperature.
Standard seasonal efficiency [to DIN] for operation with fuel oil:
88 % (H s )/94 % (H i ).
■ Standard seasonal efficiency [to DIN] improved by up to 12 % due
to condensing technology with stainless steel flue gas/water heat
exchanger Vitotrans 300.
■ Three-pass boiler, enabling clean combustion with low emissions.
■ Eutectoplex heating surface for high operational reliability and a long
service life. The homogeneous structure of the special eutectic cast
iron provides an even thermal transfer and prevents stress fractures.
■ Integral Therm-Control start-up system for easy hydraulic connections
– a shunt pump and a return temperature raising facility are not
required.
■ Fastfix assembly system for rapid and simple installation.
■ Fast and straightforward assembly of individual cast iron sections
through tongue & groove system with resilient seal for permanent
hot gas tightness.
■ Economical and safe operation of the heating system through the
digital Vitotronic control system with communication capability.
Standardised LON BUS for complete integration into building management
systems.
6.2 Operating conditions with Vitotronic boiler control units and Therm-Control
Requirements
Operation with burner load ≥ 60 % < 60 %
1. Heating water flow rate None
2. Boiler return temperature (minimum value) *3 None *2
3. Low-end boiler water temperature – Oil operation 50 °C – Oil operation 60 °C
– Gas operation 60 °C – Gas operation 65 °C
4. Two-stage burner operation Stage 1; 60 % of rated output No minimum load required
5. Modulating burner operation Between 60 and 100 % of rated output No minimum load required
6. Reduced mode Single boiler systems and lead boiler of multi-boiler systems
– Operation with the low-end boiler water temperature
Lag boilers of multi-boiler systems
– Can be shut down
7. Weekend setback As per reduced mode
Note
For water quality requirements, see page 44.
6
*3 For sample applications, see technical guide sample applications.
*2 No requirements only in conjunction with Therm-Control.
5822 426 GB
10 VIESMANN OIL/GAS BOILERS

Vitorond 200, type VD2, 320 to 1080 kW
7.1 Product description
Low temperature oil/gas boiler
Three-pass boiler in individual cast iron sections
For operation with modulating boiler water temperature
Permissible flow temperature (= safety temperature) up to 110 ºC
Permissible operating pressure 6 bar
■ CE designation: CE-0085AS0002
– according to Efficiency Directive 92/42/EEC (up to 380 kW)
– according to Gas Appliances Directive 2009/142/EC
■ Economical and environmentally friendly through modulating boiler
water temperature.
Standard seasonal efficiency [to DIN] for operation with fuel oil:
88 % (H s )/94 % (H i ).
■ Improvement in the standard seasonal efficiency [to DIN] by utilising
condensing technology with
stainless steel flue gas/water heat exchanger Vitotrans 300.
■ Three-pass boiler, enabling clean combustion with low emissions.
■ Eutectoplex heating surface for high operational reliability and a long
service life. The homogenous structure of the special eutectic cast
iron ensures an even heat transfer and prevents stress fractures.
■ Fastfix assembly system for rapid and simple installation.
■ Easy installation even in tight spaces through sectional design and
low transport weight of individual sections.
■ Fast and straightforward assembly of individual cast iron sections
through double groove system and resilient seal for permanent hot
gas tightness.
■ Economical and safe operation of the heating system through the
digital Vitotronic control system with communication capability.
Standardised LON BUS for complete integration into building management
systems.
7.2 Operating conditions with Vitotronic boiler control units
Requirements
Operation with burner load ≥ 60 % < 60 %
1. Heating water flow rate 30 % at rated output
2. Boiler return temperature (minimum value) *3 – Oil operation 40 °C – Oil operation 53 °C
– Gas operation 53 °C – Gas operation 53 °C
3. Low-end boiler water temperature – Oil operation 50 °C – Oil operation 60 °C
– Gas operation 60 °C – Gas operation 65 °C
4. Two-stage burner operation Stage 1; 60 % of rated output No minimum load required
5. Modulating burner operation Between 60 and 100 % of rated output No minimum load required
6. Reduced mode Single boiler systems and lead boiler of multi-boiler systems
– Operation with the low-end boiler water temperature
Lag boilers of multi-boiler systems
– Can be shut down
7. Weekend setback As per reduced mode
Note
For water quality requirements, see page 44.
7
5822 426 GB
*3 For sample applications, see technical guide sample applications.
OIL/GAS BOILERS VIESMANN 11

Burner
8.1 Specification, Vitoflame 100, type VEH III
8
Burner output stage 1/2
Corresponds to the rated thermal load of the boiler.
Vitoflame 100 pressure-jet oil burner in conjunction with a Vitoplex 200
Rated boiler output kW 90 120 150 200 270
Burner output
kW 68/97 91/130 114/163 152/217 205/293
First/second stage
Burner type VEH III-1SX VEH III-2SX VEH III-3SX VEH III-4SX VEH III-5SX
Oil throughput
Stage 1 kg/h 5.8 7.7 9.6 12.8 17.2
l/h 6.8 9.1 11.3 15.1 20.2
Stage 2 kg/h 8.2 11.0 13.7 18.3 24.6
l/h 9.6 12.9 16.1 21.5 28.9
Type test no. to EN 267 G1037/08S
Voltage V 230
Frequency Hz 50
Motor speed rpm 2800
Version Two-stage
Oil pump rate l/h 70
Dimensions
Length (dimension a) mm 418
Width mm 400
Height (dimension b) mm 538
Weight kg 26
Connections
R
⅜
Suction and return lines on the supplied oil
hoses
Max. permissible pre-charge pressure
in the supply lines
(for looped lines)
bar 2
Vitoflame 100 pressure-jet oil burner in conjunction with a Vitoplex 300
Rated output
kW 90 115 140 180 235 300
of the boiler
Burner output
kW 68/98 88/125 106/152 137/196 179/255 228/326
First/second stage
Burner type VEHIII-1TXA VEHIII-2TXA VEHIII-3TXA VEHIII-4TXA VEHIII-5TXA VEHIII-6TXA
Oil throughput
Stage 1 kg/h 5.2 7.4 10.6 11.6 15.0 18.2
l/h 6.1 8.7 12.5 13.7 17.7 21.4
Stage 2 kg/h 7.4 10.5 12.8 16.4 21.5 26.1
l/h 8.7 12.4 15.1 19.3 25.3 30.7
Type test no. to EN 267 G1037/08S
Voltage V 230
Frequency Hz 50
Motor speed rpm 2800
Version Two-stage
Oil pump rate l/h 70
Dimensions
Length (dimension a) mm 418
Width mm 400
Height (dimension b) mm 538
Weight kg 26
Connections
R
⅜
Suction and return lines on the supplied
oil hoses
Max. permissible pre-charge pressure
in the supply lines
(for looped lines)
bar 2
5822 426 GB
12 VIESMANN OIL/GAS BOILERS

Burner (cont.)
Vitoflame 100 pressure-jet oil burner in conjunction with a Vitoradial 300-T
Rated output
T V /T R = 50/30°C kW 101 129 157 201 263 335
T V /T R = 80/60°C kW 94 120 146 188 245 313
Burner output
kW 68/98 88/125 106/152 137/196 179/254 228/326
First/second stage
Burner type VEHIII-1TXA VEHIII-2TXA VEHIII-3TXA VEHIII-4TXA VEHIII-5TXA VEHIII-6TX
A
Oil throughput
Stage 1 kg/h 5.2 7.4 10.6 11.6 15.0 18.2
l/h 6.1 8.7 12.5 13.7 17.7 21.4
Stage 2 kg/h 7.4 10.5 12.8 16.4 21.5 26.1
l/h 8.7 12.4 15.1 19.3 25.3 30.7
Type test no. to EN 267 G1037/08S
Voltage V 230
Frequency Hz 50
Motor speed rpm 2800
Version Two-stage
Oil pump rate l/h 70
Dimensions
Length (dimension a) mm 418
Width mm 400
Height (dimension b) mm 538
Weight kg 26
Connections
R
⅜
Suction and return lines on the supplied oil
hoses
Max. permissible pre-charge pressure
in the supply lines
(for looped lines)
bar 2
8
Vitoflame 100 pressure-jet oil burner in conjunction with a Vitorond 200
Rated output
kW 125 160 195 230 270
of the boiler
Burner output
kW 95/136 122/174 149/213 175/250 205/293
First/second stage
Burner type VEH III-1VD VEH III-2VD VEH III-3VD VEH III-4VD VEH III-5VD
Oil throughput
Stage 1 kg/h 8.0 11.7 12.5 14.7 17.2
l/h 9.4 13.8 14.7 17.3 20.2
Stage 2 kg/h 11.4 14.6 17.8 21.0 24.6
l/h 13.4 17.2 20.9 24.7 28.9
Type test no. to EN 267 G1037/08S
Voltage V 230
Frequency Hz 50
Motor speed rpm 2800
Version Two-stage
Oil pump rate l/h 70
Dimensions
Length (dimension a) mm 418
Width mm 400
Height (dimension b) mm 538
Weight kg 26
Connections
R
⅜
Suction and return lines on the supplied oil
hoses
Max. permissible pre-charge pressure
in the supply lines
(for looped lines)
bar 2
Approved quality
CE designation according to current EC Directives.
5822 426 GB
OIL/GAS BOILERS VIESMANN 13

Burner (cont.)
8
b
a
A Service switch (for burner adjustment)
B Hood adaptor
C Quick-action fastener
D Electronic ignition
E Servomotor
F Burner control unit
G Return line
H Suction line
I Solenoid valve stage 2
K Solenoid valve stage 1
L Flame monitor
M Reset button
N Oil line
O Oil pump
P Fan motor
R Fan housing
S Impeller
T Inlet air silencer
U Air regulating valve
V Blast tube connection
W Flame tube
X Guide stays
Y Sensor plate
Z Oil burner nozzle
a Ignition electrodes
b Ignition cable
c Flange
5822 426 GB
14 VIESMANN OIL/GAS BOILERS

Burner (cont.)
8.2 Specification, Vitoflame 100, type VG III
Burner output stage 1/2
Corresponds to the rated thermal load of the boiler.
Connection values
H uB relative to 1013 m bar and 15 °C gas temperature.
8
Vitoflame 100 pressure-jet gas burner in conjunction with a Vitoplex
Vitoplex 200 (type SX2)
Vitoplex 300 (type TX3A)
Rated output
kW 90 120 150 200 90 115 140 180
of the boiler
Burner output
kW 59/98 78/130 98/163 130/217 59/98 75/125 91/152 118/196
First/second stage
Burner type VG III-2 VG III-3 VG III-4 VG III-5 VG III-2 VG III-3 VG III-4 VG III-5
Product ID CE-0085 AQ 0222 CE-0085 AQ 0222
Voltage V 230 230
Frequency Hz 50 50
Power consumption W 200 225 250 390 225 250 340 390
Motor speed rpm 2800 2800
Version Two-stage Two-stage
Dimensions
Burner:
Length (dimension d) mm 410 410 410 430 410 410 430 430
Width (dimension a) mm 576 576 576 576 576 576 576 576
Height (dimension e) mm 596 596 596 596 596 596 596 596
Gas train:
Dimension f mm 295 295 295 295 295 295 295 295
Dimension b mm 43 51 83 83 51 83 83 102
Dimension g mm 85 63 63 63 63 63 63 15
Dimension h mm 733 733 733 733 733 733 733 743
Dimension c mm 412 420 500 500 420 500 500 545
Weight kg 41 41 41 48 41 41 48 48
Burner with combination valve
Gas supply pressure mbar 20 20
Gas connection R 1 1 1 1¼ 1 1 1 1¼
Connection values
in relation to the max. load
with gas with H uB
Natural gas E 9.45 kWh/m 3 m 3 /h 10.4 13.8 17.3 23.0 12.1 14.9 19.5 25.9
34.02 MJ/m 3
Natural gas LL 8.13 kWh/m 3 m 3 /h 12.0 16.0 20.1 26.7 14.0 17.4 22.7 30.1
29.25 MJ/m 3
B
c
A
g
e
h
f
a
b
d
5822 426 GB
A Gas shut-off valve
B Boiler door
OIL/GAS BOILERS VIESMANN 15

Burner (cont.)
8
Note
The combination valve may be fitted on the r.h. or the l.h. side of the
boiler.
Vitoflame 100 pressure-jet gas burner in conjunction with a Vitorond 200
Rated output
kW 125 160 195
of the boiler
Burner output
kW 82/136 104/174 128/213
First/second stage
Burner type VG III-3R VG III-4R VG III-5R
Product ID CE-0085 AQ 0222
Voltage V 230
Frequency Hz 50
Power consumption W 250 340 390
Motor speed rpm 2800
Version
Two-stage
Dimensions
Burner:
Length (dimension d) mm 410 430 430
Width (dimension a) mm 576 576 576
Height (dimension e) mm 596 596 596
Gas train:
Dimension f mm 288 288 288
Dimension b mm 85 85 130
Dimension g mm 63 63 15
Dimension h mm 810 810 810
Dimension c mm 500 500 545
Weight
kg 41
Burner with combination valve
Gas supply pressure mbar 20
Gas connection
R (female
1 1 1¼
thread)
Connection values
in relation to the max. load
with gas with H uB
Natural gas E 9.45 kWh/m 3 m 3 /h 14.5 18.6 22.6
34.02 MJ/m 3
Natural gas LL 8.13 kWh/m 3 m 3 /h 16.9 21.6 26.3
29.2 MJ/m 3
Approved quality
CE designation according to current EC Directives.
5822 426 GB
16 VIESMANN OIL/GAS BOILERS

Burner (cont.)
c
8
g
e
h
f
a
b
d
A Gas shut-off valve
B Boiler door
Note
The combination valve may be fitted on the r.h. or the l.h. side of the
boiler.
5822 426 GB
A Combination valve
B Quick-action fastener
C Servomotor
D Air pressure switch
E Fan motor
F Reset button
G Burner control unit
H Ignition transformer
K Mixer assembly
L Ignition electrode
M Sensor plate
N Ionisation electrode
OIL/GAS BOILERS VIESMANN 17

Burner (cont.)
8
O Blast tube
P Impeller
R Inlet air silencer
S Burner hood
T Air regulating valve
U Service switch for burner adjustment
V Flange gasket
W Ball shut-off valve
5822 426 GB
18 VIESMANN OIL/GAS BOILERS

Installation accessories
9.1 Specification
Accessories for heating circuits
Divicon heating circuit distributor
for boilers up to 335 kW
Specification
Construction and function
■ 1 to 4 heating circuits can be connected to the flow distributor and
return collector.
■ Free connections are closed via dummy flanges (part of the standard
delivery).
Divicon heating circuit distributor, installed adjacent to the boiler
■ The flow distributor and return collector can optionally be arranged
on the r.h or the l.h side of the boiler.
■ Thermal insulation for the Divicon heating circuit distributor is part of
the standard delivery.
9
280 - 400
For Vitorond 200, 125 to 270 kW, Vitoplex 200, 90 to 270 kW, Vitoplex
300, 90 to 300 kW, Vitoradial 300-T, 101 to 335 kW and
Vitocrossal 200/300, 87 to 314 kW.
The Divicon heating circuit distributor can also be placed near the
boiler (as an alternative to wall mounting) by means of its separate feet
and on-site pipe connections.
5822 426 GB
OIL/GAS BOILERS VIESMANN 19

Installation accessories (cont.)
Divicon heating circuit distributor, wall mounted
For Vitoplex 200, 90 to 270 kW, Vitoplex 300, 90 to 300 kW, Vitoradial
300-T, 101 to 335 kW, Vitorond 200, 125 to 270 kW and
Vitocrossal 200/300, 87 to 314 kW.
420
420
420
= 307
9
b
a
c
EL
E
EL
E
70
210
910
360
500
1630
E Drain
EL Air vent valve
Dimensions
Rated boiler output kW 90-201 235-335
a (DN 25 + DN 32) mm 1186 1196
b (DN 40 + DN 50) mm 1586 1606
c mm 170 173
Connections for an additional consumer (e.g. DHW cylinder)
2 pipe nipples G 1½ (male thread) on the back of the flow and return
manifolds.
67
72,5
190
80
210
5822 426 GB
20 VIESMANN OIL/GAS BOILERS

Installation accessories (cont.)
Heating circuit connections
Heating circuit connection DN 25 and DN 32 (shown with mixer)
Heating circuit connection DN 40 and DN 50 (shown with mixer)
210
210
9
1252
852
A Heating flow
B Heating return
C Ball valve
D Check valve
E Circulation pump
F Three-way mixer
5822 426 GB
A Heating flow
B Heating return
C Ball valve
D Check valve
E Circulation pump
F Three-way mixer
Output which can be connected to the heating circuit connections (ΔT = 20 K)
Heating circuit connection
kW
DN 25 40
DN 32 70
DN 40 140
DN 50 170
Wilo heating circuit pumps, differential pressure regulated
(Adjustable from proportional pressure to constant pressure)
Motor protection
Integral motor protection in terminal boxes for all differential pressure
settings. Breaking capacity of the contacts for central fault message
1 A, 250 V~.
230 V~, 50 Hz
Heating circuit connection DN 25 32 40 50
Pump type E 25/1-5 E 30/1-5 Stratos 40/1-8 Stratos 50/1-8
Rated output P 2 W 47 47 200 200
OIL/GAS BOILERS VIESMANN 21

Installation accessories (cont.)
Heating circuit connection DN 25 32 40 50
Speed range n min -1 600-2600 600-2600 1800-4800 1800-4800
Power consumption P 1 W 36-89 36-89 18-290 18-290
Current I A 0.17-0.43 0.17-0.43 0.18-1.32 0.18-1.32
Head
Heating circuit pump DN 25 and DN 32
600
6
600
6
9
500
400
5
4
max.
500
400
5
4
max.
300
3
300
3
200
2
200
2
Head
mbar
100
0
m
1
0
min.
0 0.5 1 1.5 2 2.5 3 3.5 4
Flow rate in m³/h
Head
mbar
100
0
m
1
0
min.
0 0.5 1 1.5 2 2.5 3 3.5 4
Flow rate in m³/h
Proportional pressure
Constant pressure
Head
Heating circuit pump DN 40
Head
mbar
900
800
700
600
500
400
300
200
100
0
m
9
8
7
6
5
4
3
2
1
0
min.
max.
0 2 4 6 8 10 12 14
Flow rate in m³/h
Head
mbar
900
800
700
600
500
400
300
200
100
0
m
9
8
7
6
5
4
3
2
min.
max.
1
0
0 2 4 6 8 10 12 14
Flow rate in m³/h
Proportional pressure
Constant pressure
Head
Heating circuit pump DN 50
Head
mbar
900
800
700
600
500
400
300
200
100
0
m
9
8
7
6
5
4
3
2
1
0
min.
max.
0 2 4 6 8 10 12 14
Flow rate in m³/h
Head
mbar
900
800
700
600
500
400
300
200
100
0
m
9
8
7
6
5
4
3
2
1
0
min.
max.
0 2 4 6 8 10 12 14
Flow rate in m³/h
Proportional pressure
Constant pressure
5822 426 GB
22 VIESMANN OIL/GAS BOILERS

Installation accessories (cont.)
Electrical connection
Heating circuit pump DN 25 and DN 32
L N
A
L N 20
9
A Connecting cable with plug-in connector
Electrical connection
Heating circuit pump DN 40 and DN 50
DP
T
0 ... 10 V
Colour coding to DIN IEC 60757
BK black
BK * black cable with imprint
BN brown
BU blue
GNYE green/yellow
Ext.
off
BK
BK*
BU
BN
L N PE SSM
1-230 V
GNYE
BU
BN
L N 20
5822 426 GB
A Terminals in the pump
B 4-core cable for starting/stopping a pump and pump fault notification
C Central fault message
D External starting/stopping of the pump
E Connection via the contactor in the control panel or contactor
relay, part no. 7814 681
F Plug sÖ for connection to the Vitotronic
G 3-core cable for network connection to the pump
Grundfos heating circuit pumps, differential pressure regulated
(Adjustable from proportional pressure to constant pressure)
Motor protection
The motor and the electrical equipment are protected against thermal
overload. No external motor protection is required.
230 V~, 50 Hz
Heating circuit connection
Pump type ALPHA2 25-60 ALPHA2 32-60 MAGNA
UPE 40-120
DN 25 32 40 50
MAGNA
UPE 50-60
Speed range n min -1 906-3245 906-3245 900-3580 680-1970
Power consumption P 1 W 5-45 5-45 25-445 32-335
Current I A 0.05-0.38 0.05-0.38 0.16-2.0 0.2-1.51
OIL/GAS BOILERS VIESMANN 23

Installation accessories (cont.)
Head
Heating circuit pump DN 25 and DN 32
9
Head
mbar
600
500
400
300
200
100
0
m
6
5
4
3
2
1
0
0 0.4 0.8 1.2 1.6 2.0 2.4 2.8 3.2
Flow rate in m³/h
A Automatic adaptation function
B Upper curve, proportional pressure
C Lower curve, proportional pressure
D Upper curve, constant pressure
E Upper curve, constant pressure
F Pump stage 1 for manual setting
G Pump stage 2 for manual setting
H Pump stage 3 for manual setting
Head
Heating circuit pump DN 40
1400
14
1400
14
1200
1000
12
10
max.
1200
1000
12
10
max.
800
8
800
8
600
6
600
6
400
4
400
4
Head
mbar
200
0
m
2
0
min.
0 2 4 6 8 10 12 14
Flow rate in m³/h
16 18 20
Head
mbar
200
0
m
2
0
min.
0 2 4 6 8 10 12 14
Flow rate in m³/h
16 18 20
Proportional pressure
Constant pressure
Head
Heating circuit pump DN 50
Head
mbar
700
600
500
400
300
200
100
0
m
7
6
5
4
3
2
1
min.
max.
0
0 4 8 12 16 20 24 28 32
Flow rate in m³/h
Proportional pressure
Head
mbar
700
600
500
400
300
200
100
0
m
7
6
5
4
3
2
1
Constant pressure
min.
max.
0
0 4 8 12 16 20 24 28 32
Flow rate in m³/h
5822 426 GB
24 VIESMANN OIL/GAS BOILERS

Installation accessories (cont.)
Electrical connection
Heating circuit pump DN 25 and DN 32
L N
A
L N 20
9
A Connecting cable with plug-in connector
Electrical connection
Heating circuit pump DN 40 and DN 50
Colour coding to DIN IEC 60757
BK black
BK * black cable with imprint
BN brown
BU blue
GNYE green/yellow
A
B
C
1 2 3 8 7
L N
NCNOC
S
T
O
P
BN
BU
GNYE
K
E
BN
BU
F
G
BK
BK
D
H
L
N 20
A Power supply
B Signal output
C ON/OFF
D Cable for starting/stopping a pump and pump fault notification (4-
core)
E Central fault message
F External starting/stopping of the pump
G Connection via the contactor in the control panel or contactor
relay, part no. 7814 681
H Plug sÖ for connection to the Vitotronic
K 3-core cable for network connection to the pump
5822 426 GB
Residual head
Residual head of the heating circuits
Deduct the pressure drop of the mixer and the boiler circuit (boiler,
pipework, flow distributor and return collector) from the pump head.
The total water volume of all heating circuits should be taken into consideration
in the boiler circuit.
OIL/GAS BOILERS VIESMANN 25

Installation accessories (cont.)
Boiler circuit pressure drop
(Boiler + pipework + flow distributor and return collector + heating circuit
connection without mixer)
Mixer pressure drop
A
B C D
A BC
D E
500
9
100
50
40
30
200
100
50
Pressure drop in mbar
20
15
10
5
4
3
2
1
1 2 3 4 5 10 15 20
Flow rate in m³/h
A DN 65: Vitorond 200, 125 and 160 kW,
B DN 65: Vitorond 200, 195 kW,
C DN 65: Vitorond 200, 230 and 270 kW,
D DN 65: Vitoplex 200/300, 90 to 200 kW
E DN 80: Vitoplex 200/300, 235 to 300 kW
Example for calculating the residual head
Pressure drop mbar
20
10
5
2
1
0.1 0.2 0.5 1 2 5 10 20
Flow rate in m³/h
A DN 25
B DN 32
C DN 40
D DN 50
Note
For the resistances of the pipework between the boiler and distributor,
6 x 90° bends and 5 m pipe lengths should be taken into consideration.
If essentially different lengths and shapes must be used on-site, the
relevant drops in pressure must be calculated and taken into
account.
Heating system with:
– Divicon heating circuit distributor DN 80
– Htg circ. 1: 1 heating circuit connection DN 25 without mixer, Output 35 kW, Flow rate 1.5 m 3 /h
– Htg circ. 2: 1 heating circuit connection DN 32 with mixer, Output 60 kW, Flow rate 2.5 m 3 /h
– Htg circ. 3: 1 heating circuit connection DN 50 with mixer, Output 150 kW, Flow rate 6.5 m 3 /h
Total flow rate 10.5 m 3 /h
Boiler circuit pressure drop
Boiler + pipework + flow distributor and return collector + heating circuit connection (without mixer) (see diagram) = 30 mbar
Mixer pressure drop
(see diagram)
Mixer DN 32 50
Pressure drop mbar 18 22
Sum of the boiler circuit pressure drop and heating circuit connection pressure drop
Heating circuit 1: 30 mbar
Heating circuit 2: 30 mbar + 18 mbar = 48 mbar
26 VIESMANN OIL/GAS BOILERS
5822 426 GB

Installation accessories (cont.)
Heating circuit 3: 30 mbar + 22 mbar = 52 mbar
Residual head of the individual heating circuits
With Wilo circulation pump
Heating circuit 1 2 3
Head of the circulation pump (adjustable) mbar 100 to 400 100 to 280 100 to 760
Boiler circuit + heating circuit connection pressure drop mbar 30 48 52
Residual head (adjustable) mbar 70 to 370 52 to 232 48 to 708
With Grundfos circulation pump
Heating circuit 1 2 3
Head of the circulation pump (adjustable) mbar 100 to 400 100 to 260 150 to 520
Boiler circuit + heating circuit connection pressure drop mbar 30 48 52
Residual head (adjustable) mbar 70 to 370 52 to 212 98 to 468
Vitocontrol control panel
(On request)
Control panel for regulating the heating system in conjunction with a
Divicon heating circuit distributor.
The control panel comprises all components required for the control
and monitoring of the heating system.
The system is designed so that the following equipment could be
installed next to the control equipment of 1 to 4 boilers: e.g.
Vitotronic 300-K (type MW1S), Vitotronic 200-H (type HK1S or HK3S),
pump control, test equipment, time switches etc.
10
5822 426 GB
Design information
10.1 Delivery, handling and installation
Delivery
We deliver the equipment to site on a vehicle with crane facility and
will unload the equipment subject to requirements.
Handling and positioning
A number of lifting eyes will be provided on each boiler and flue gas/
water heat exchanger where lifting gear may be attached. The linear
base rails simplify handling.
Our experts can undertake the handling and installation on prepared
foundations upon request (chargeable option).
The boiler is mounted on linear base rails. These rails may be placed
onto the ground without further concrete foundations. Observe the
max. installed burner height.
Installation room
General requirements of the installation room
■ Avoid air contamination through halogenated hydrocarbons (e.g. as
in sprays, paints, solvents and cleaning agents)
■ Avoid very dusty conditions
■ Avoid high levels of humidity
■ Prevent freezing and ensure good ventilation
In rooms where air contamination through halogenated hydrocarbons
can occur, install the boiler and the Vitotrans 300 flue gas/water
heat exchanger only if adequate measures can be taken to provide a
supply of uncontaminated combustion air.
If these instructions are not observed, any consequential losses
directly related to any of these causes are excluded from our warranty.
If in doubt, please contact us.
Requirements of the Sample Combustion Order
The installation room must meet the standards laid down by the "Fire
Regulations" of the respective country. Observe the Building Regulations
and Fire Regulations of the respective country of installation.
Boilers with a shipping weight in excess of 10 t require a special crane
on site for unloading.
However, to facilitate the cleaning of the installation room it is appropriate
to position the boiler on a plinth.
For recommended minimum clearances to walls for installation and
maintenance work, see the datasheet of the relevant boiler.
Anti-vibration boiler supports may be used if anti-vibration measures
are required. Adjustable anti-vibration feet may also be inserted into
the base rails of the Vitoplex up to 560 kW.
Combustion air supply
For open flue combustion equipment with a total rated output in excess
of 35 kW, the fresh ventilation is deemed to have been verified if the
combustion equipment is located in areas which provide an aperture
or duct leading outdoors.
At 35 kW rated output, the cross-section of the aperture must be at
least 150 cm 2 . For every kilowatt rated output in excess of 35 kW, the
aperture must be 2 cm 2 larger than stated above.
Pipes must be sized to provide equivalent flow rates. The required
cross-section may be split over a maximum of 2 apertures or pipes.
OIL/GAS BOILERS VIESMANN 27

Design information (cont.)
10
A
cm²
A = 150 cm² + 2 x (Σ²n – 35 kW)
kW
Σ² n = total rated output in kW
Combustion air apertures and ducts must not be closed or blocked if
installed safety equipment cannot adequately ensure that the combustion
equipment can only be operated when the aperture is open.
The required cross-section must not be blocked by any closure or
grille.
Emergency stop switch
The burner, the fuel supply equipment and the burner control units
must be able to be switched OFF at any time by an emergency stop
switch installed outside the installation room.
Provide a sign adjacent to the emergency stop switch with the inscription
"EMERGENCY STOP SWITCH - COMBUSTION".
Safety precautions
For gas combustion equipment, fuel lines must be equipped with the
following safety equipment immediately upstream of the gas combustion
equipment:
■ The fuel supply must automatically shut off in case of an external
thermal load in excess of 100 ºC.
■ Up to a temperature of 650 ºC and over a period of at least 30 min,
not more than 30 l/h (measured as air flow rate) must be able to flow
through or out of the fuel line.
Combustion equipment must be installed far enough away from combustible
materials and built-in furniture or be shielded from such material/furniture,
so that at the rated output of the combustion equipment,
no temperatures exceeding 85 ºC will occur. Alternatively, maintain a
distance of at least 40 cm.
Heating on board ships
Some special conditions must be observed if boilers are used to heat
accommodation on board ships:
■ On ships, the integrated products are subjected to substantial loads.
■ Observe the special requirements specified by insurance underwriters
– ship classification companies
■ In some cases, our boilers cannot be used.
For that reason, please check the relevant details with our sales consultants.
Load-bearing boiler cover
From 620 kW the Vitoplex is supplied with a fitted load-bearing boiler
cover.
10.2 System design
Flow temperatures
To minimise distribution losses, we recommend that you size the heat
distribution system and the DHW heating to a max. flow temperature
of 70 ºC.
Safety temperatures
Viessmann boilers comply with EN 303 and DIN 4702, and all are CEdesignated.
They are suitable for installation in sealed heating systems
to EN 12828.
Selection of rated output
Select boilers according to the required heat load.
The efficiency of low temperature and condensing boilers is constant
across the wide boiler load range.
Requirements through heat load
The requirements of EN 12831 relating to the heat load calculation are
met by the weather-compensated control units. To reduce the heat-up
load, the night setback is reduced in case of low outside temperatures.
The flow temperature will be raised for a limited time to reduce the
heat-up time after a setback period.
For boilers supplied with a boiler control unit, limit the max. boiler water
temperature to 85 ºC. The flow temperature may be increased by
adjusting the control thermostat.
■ Permissible flow temperatures (= safety temperatures):
up to 110 ºC
To EN 12953: up to 120 ºC (on request)
■ Maximum flow temperature:
approx. 15 K below the safety temperature
■ High limit safety cut-out of the boiler control unit:
Delivered condition 110 ºC
Adjustable to 100 ºC
Therefore, the rated output for low temperature boilers, condensing
boilers and multi-boiler systems may be higher than the calculated
heat load of the building in question.
5822 426 GB
28 VIESMANN OIL/GAS BOILERS

Design information (cont.)
Pump-controlled pressure maintaining systems
In heating systems with automatic and in particular pump-controlled
pressure maintaining systems with integral deaerating, we recommend
the installation of a diaphragm expansion vessel (DEV) for each
boiler as individual protection.
Boiler output
in kW
Diaphragm expansion vessel
Capacity in litres
up to 300 50
up to 500 80
up to 1000 140
up to 2000 300
up to 5000 800
up to 10000 1600
This reduces the frequency and level of pressure fluctuations. This
contributes considerably to improved operational reliability and longer
service life of the system components.
Damage to the boiler or to other system components may result if
these recommendations are not followed.
Also ensure that only corrosion-technically sealed PDH systems are
used, which are protected against oxygen ingress into the heating
water. Otherwise damage to the system through oxygen corrosion can
result.
PDH systems with atmospheric deaerating through cyclical pressure
release create a central post-ventilation of the heating system, but
represent no oxygen removal in the sense of corrosion protection to
VDI 2035 sheet 2.
10.3 Water connection
Heating connections
Existing systems
Flush the heating system thoroughly before connecting the boiler to
an existing heating system, to remove dirt and sludge residues.
Otherwise, these dirt and sludge residues will be deposited in the boiler
and can lead to local overheating, noise and corrosion. Boiler damage
caused by such deposits is excluded from our warranty. Where necessary,
install dirt traps.
Connections on the heating water side
Connect all heat consumers or heating circuits to the boiler flow and
return connectors. Never make any connections to the safety flow or
to other connections.
We recommend you install shut-off valves into the heating flow and
return lines, so that the entire water content will not have to be drained,
should work be required on the boiler or heating circuits.
Heating circuits
For heating systems with plastic pipes, we recommend the use of
impermeable pipes to prevent the diffusion of oxygen through the pipe
walls. Provide system separation in heating systems with plastic pipes
to (DIN 4726) which are permeable to oxygen. We supply a separate
heat exchanger for this.
Underfloor heating systems and heating circuits with a large water
content should also be connected via mixers, if low temperature and
ultra-low temperature boilers are used. These should be controlled via
the Vitotronic 300 (type GW2), Vitotronic 300-K or with a separate
control unit, e.g. the Vitotronic 200-H.
Easy installation
For safety temperatures up to 110 ºC, the Vitoplex boilers require no
intermediate flow piece, that is costly and difficult to install, for the
connection of safety equipment.
All connections required for the various pieces of equipment, e.g. for
water level or pressure limiters, are provided on the boiler.
10
5822 426 GB
Boiler circuit and shunt pumps
The Vitoplex boilers, Vitorond 200, type VD2A and the Vitoradial 300-
T require no boiler circuit pumps for forced circulation. The
Vitorond 200, type VD2A from 125 to 270 kW, the Vitoplex 300 from
90 to 2000 kW and the Vitoplex 200 from 90 to 560 kW with Therm-
Control generally also require no return temperature raising facility.
For more detailed information, see the sample applications.
A shunt pump has proven appropriate for those boilers or individual
cases where a return temperature raising facility is required. The large
water content and the low internal pressure drop of the Vitoplex boilers
enable the system to operate with just a pump for raising the return
temperature (shunt pump), which should be sized to approx. 30 % of
the total flow volume.
The shunt pump will only be activated when the actual temperature
falls below the minimum return temperature.
System accessories
Divicon heating circuit distributor
Pre-assembled heating circuit distributor for connecting up to 4 heating
circuits to the Vitoplex up to 300 kW, the Vitorond up to 270 kW and
the Vitoradial 300-T in single boiler systems.
To be positioned on the l.h. or r.h. side of the boiler or in conjunction
with wall mounting brackets, on the wall.
Resulting advantages are:
■ Smaller pumps, i.e. reduced investment
■ Lower power consumption of the pump
■ The shunt pump runs for shorter periods
■ Reduced electricity bills
Information regarding the heating circuit pumps
Heating circuit pumps in heating systems with rated output > 25 kW
must be equipped or designed in such a way, that the power consumption
will be matched automatically to the operational delivery
demand in at least three stages, if no safety concerns relating to the
boiler make demands to the contrary.
For the Vitorond, provide the Divicon pipe connections on site. See
Divicon heating circuit distributor from page 19.
OIL/GAS BOILERS VIESMANN 29

Design information (cont.)
Return temperature raising facility
For the Vitoplex up to 560 kW, we deliver a pre-assembled return temperature
raising facility for installation to the boiler flow and return connectors;
for the Vitorond up to 270 kW, to the boiler connection kit. See
datasheet "Boiler accessory".
Boiler flue connection kit for the Vitorond
For the connection of the following system components:
■ Flow and return
■ Safety equipment
■ Return temperature raising facility
Sample applications
For technical guide sample applications.
10.4 Safety equipment
The EN 12828 applies to the design of hot water heating systems with safety temperatures up to 110 ºC. Take the requirements of EN 12953
into consideration for heating systems with 120 ºC. This standard contains safety requirements laid down for boilers and boiler systems.
Safety equipment to EN 12828 Safety equipment to EN 12953
10
HR
HK
HK
HV
HR
HK
HK
HV
HKP
HKP
AV1
AV1
AV1
AV1
STB
STB
TR
TH
SIV
STB
STB
TR TH
SIV
EST
SDB1 SDB2 SDB2
AV2
SDB1 SDB2 MA
AV2
MA
WB
TH
WB
ADG
ADG
SL
E
AV2 AV1
SL
E
AV2 AV1
Required safety equipment
ADG Sealed expansion vessel
AV1 Shut-off valve
AV2 Shut-off valve with protection against unintentional closing, e.g.
cap valve
E Drain
EST Flash trap
MA Pressure gauge assembly
SDB1 Safety pressure limiter max.
SDB2 Safety pressure limiter min.
SIV Safety valve
SL Safety expansion line
STB High limit safety cut-out
TH Thermometer
TR Temperature controller
WB Water level limiter
(only required for Vitorond)
Further legends
HC Heating circuit
HKP Heating circuit pump
HR Heating water return
HV Heating water flow
In the diagram Safety equipment to EN 12828, the replacement set for
the flash trap is shown with an additional high limit safety cut-out and
safety pressure limiter.
5822 426 GB
30 VIESMANN OIL/GAS BOILERS

Design information (cont.)
General information
Low water indicator
EN 12828 specifies that boilers must be equipped with a low water
indicator (water level limiter). A low water indicator is not required for
the Vitoplex boilers up to 300 kW (except in attic heating centres).
Tests have verified that the burner will be automatically switched OFF
in the event of water shortage due to a leak in the heating system and
simultaneous burner operation, before the boiler or the flue system
reach unacceptably high temperatures.
Maximum pressure limiter
This is required for every boiler in a system if the rated boiler output
exceeds 300 kW.
Minimum pressure limiter
Is required once per system.
Safety valve
Equip the boilers to EN 12828 with a type-tested safety valve. This
must be sized according to EN 4126 marked with "D/G/H" according
to TRD 721:
The pipework between the boiler and the safety valve must not be able
to be shut off. Pumps, fittings or restrictions must not be present in this
pipework.
Flash trap
For boilers above 300 kW, install a flash trap with blow-off and drain
line near the safety valve. The blow-off line must lead outdoors. Any
extracted steam must not endanger anyone.
The blow-off line on the safety valve should be constructed so as to
prevent the possibility of increases in pressure. Arrange the outlet of
the drain line so that any water expelled by the safety valve can be
safely observed and drained off.
Flash trap replacement
A flash trap and blow-off line are not required if a second high limit
safety cut-out and a second maximum pressure limiter are installed.
10
Safety accessories selection table
The following table lists the control equipment required for sealed unvented heating systems.
System Boilers Boilers System Boiler
≤ 300 kW > 300 kW
Safety temperature 110 ºC to EN 12828 120 °C to EN 12953
High limit safety cut-out – 1 1 – 2
Control thermostat
Included in the delivery of the boiler control unit
– 1 1 – 1
Boiler thermometer
1 x flow
1 1 1 –
In the standard delivery of the boiler control unit
1 x return
Pressure gauge assembly
Pressure gauge
1 1 1 – 1
Fill and sampling valve – – 1 – 1
Safety valve – 1 1 – 1
Low water indicator (from boiler output >300 kW)
According to EN 12828, the low water indicator can be
1 – – – 1
replaced by an additional min. pressure limiter.
Maximum pressure limiter – 1 1 – 1
Minimum pressure limiter 1 – – 1 –
Flash trap
1 – – – –
or
According to the EN 12828, the flash trap is not required, if
an additional high limit safety cut-out and a safety pressure
limiter (maximum pressure limiter) are installed.
High limit safety cut-out (1) – – – –
Safety pressure limiter (maximum pressure limiter) (1) – – – –
Note
If a boiler is operated at a safety temperature of 120 ºC, it must be supervised in accordance with the Health & Safety at Work Act [Germany].
Components with a safety function must have fail-safe operation, as well as redundancy, heterogeneity and self-monitoring. An accessory pack
is available for 120 ºC safety temperature. Further information is available in EN 12953.
5822 426 GB
10.5 Fuel
The Vitoplex and Vitorond are suitable for operation with the following
fuels:
■ Fuel oil EL to DIN 51603
■ Natural gas, town gas and LPG according to DVGW Code of Practice
G 260/I and II [Germany] or local regulations. The Viessmann
Vitoflame 100 pressure-jet gas burners are only suitable for operation
with natural gas E and LL.
■ Biogas and sewer gas:
Operation with biogas/sewer gas is possible. Special operating
conditions apply, as these gases generally contain sulphur compounds
(the consistency of which can fluctuate considerably) and
other aggressive gases.
– The gas must be free from halogenated hydrocarbon.
– For all operating conditions, the minimum return temperature
should be above 65 ºC. This requires the installation of an effective
return temperature raising facility.
OIL/GAS BOILERS VIESMANN 31

Design information (cont.)
– Maintain the boiler standby at all times, i.e. never allow a night or
weekend shutdown.
– Maintenance intervals may be shortened as biogas is frequently
contaminated. Regularly clean and service the boiler.
■ Alternative fuels on request.
10.6 Burners
10
Suitable burners
For matching the boiler and burner, an installation height of up to
250 m above sea level is applied
Pressure-jet oil burner
The burner must be checked and certified to EN 267.
Pressure-jet gas burner
The burner must be tested to EN 676 and be identified with the CE
designation in accordance with the Gas Appliances Directive.
Unit burner
Viessmann pressure-jet oil or gas burners are offered for the Vitoplex
up to 300 kW and the Vitorond up to 270 kW.
Vitoradial 300-T is available with the Viessmann pressure-jet oil
burner. Gas burner on site.
Elco and Weishaupt pressure-jet oil and gas burners are available for
the Vitoplex from 350 to 2000 kW and the Vitorond from 320 kW.
See pricelist.
Obtain these from the burner manufacturers.
Applications
The boiler operates with positive pressure in the combustion chamber.
Use a burner that is suitable for the pressure drop on the hot gas side
(see the datasheet for the boiler concerned).
Observe the pressure drop values of these additional devices when
using the Vitotrans 300 flue gas/water heat exchangers. You cannot
use the Viessmann pressure-jet oil and gas burners Vitoflame 100, 90
to 300 kW in conjunction with the Vitotrans 300 flue gas/water heat
exchangers installed downstream of the boiler.
The material of the burner head must be suitable for operating temperatures
of at least 500 °C.
Burner versions
You may use multi-stage or variable (modulating) burners.
Burner installation
See details in the datasheets of the respective boiler.
Burner settings
Adjust the maximum burner oil or gas throughput so that the stated
maximum boiler output will not be exceeded. Note that, for stepped or
modulating burners, the flue system must be suitable for the low flue
gas temperatures that may arise during partial load operation.
Maintain the minimum rated output specified under the relevant operating
conditions when using the boilers together with the Vitotronic
control units.
10.7 Flue gas routing
Requirements in accordance with the Sample Combustion Order [Germany]
Observe the specific Building Regulations and Fire Regulations in your
country. We recommend you seek advice from your local flue gas
inspector.
1. The flue system must be sized in accordance with the clearance
diameter and height and if required also according to the heat
throughput resistance and the internal surface to ensure that the
flue gases will be extracted to the outside under all operating conditions
and so that no dangerous pressures can be created in any
rooms.
2. Flue gases from combustion equipment fired by liquid or gaseous
fuels can be piped into chimney stacks or into flue pipes.
3. For outlets from chimneys in combustion systems, the following
conditions apply:
■ For roofs with a slope of up to 20° inclusive, the outlets must be
at least 40 cm higher than the roof ridge or be at least 1m away
from the roof surface.
■ For roofs with a slope of more than 20°, the outlets must be at
least 40 cm higher than the roof ridge or have a horizontal clearance
from the roof surface of at least 2 m and 30 cm.
■ For combustion systems with a total output of up to 50 kW, the
outlets must be at least 1 m higher than the edges of ventilation
apertures, windows or doors within a radius of 15 m; the radius
increases by 2 m for every 50 kW begun, up to a maximum of 40
m.
4. As an alternative to section 3, for combustion systems with a combustion
output of 1 MW or more, the height of the outlet must be at
least 3 m above the highest point of the roof ridge and at least 10
m above ground level.
With a roof slope of less than 20°, relate the height of the outlet to
a fictitious roof ridge, the height of which should be calculated on
the assumption of a roof slope of 20°.
5. As an alternative to section 3, the flue gas from combustion systems
with >10 MW should be routed away via one or more chimneys, the
height of which should be calculated according to the regulations of
the TA-Luft [Germany] of 24 July 2002.
6. For combustion systems with a combustion output > 20 MW:
■ Observe the TA-Luft regulations [Germany]; obtain an emission
assessment.
■ Check with the appropriate local authority regarding regional
requirements.
■ Emission assessments will be provided by approved institutes.
7. Provide a sufficiently large and easily accessible test port in the flue
duct.
32 VIESMANN OIL/GAS BOILERS
5822 426 GB

Design information (cont.)
≥ 1,0 m
≥ 1,0 m
≥ 0,4 m
a ≥ 1,0 m
≥ 2,3 m
≥ 0,4 m
a ≥ 1,0 m
≥ 2,3 m
≤ 20°
≥ 1,0 m
x < 1,5 m
> 20°
≥ 2,3 m
x < 1,5 m
If x < 1.5 m, then a ≥ 1.0 m
If x < 1.5 m, then a ≥ 1.0 m
10
Sizing the flue system
Calculating the cross-sections of the flue gas system is a basic and
essential requirement for the correct function of any flue gas system.
Standard values:
■ Flue gas temperature at the boiler flue outlet 140 to 190 ºC and
ambient temperature + 15 ºC.
■ The effective flue system height equals the height difference
between the boiler flue outlet and the flue gas terminal.
■ Length of the connecting piece max. ¼ of the effective flue system
height, but not more than 7 m. The connecting piece and the flue
system should have the same cross-section.
■ We recommend that flue gases enter the flue system at an angle of
less than 45º.
■ Plug-in flue systems are not recommended.
Chimney diagrams
Check when applying the following diagrams whether the parameters
for calculating the flue gas temperature, length of connecting piece and
of the drag coefficient have been maintained. In the case of more
severe deviations, the technical departments of flue system manufacturers
will calculate cross-sections which are accurately matched to
each individual project.
5822 426 GB
OIL/GAS BOILERS VIESMANN 33

Design information (cont.)
Diagram for round cross-sections (Schiedel)
2000
1500
60
55
50
10
Rated output in kW
1000
900
800
700
600
500
450
400
350
300
230
200
150
45
40
35
30
25
22
20
100
18
90
80
16
70
5 10 15 20 25 30 35 40 45 50 55 60
Effective height of the flue gas system
The diagram shown is also a valid representation for other manufacturers.
The installing contractor should check how far this diagram can
be applied to the flue systems offered by alternative manufacturers.
Diagram for square cross-sections (Plewa)
2000
1500
50 x 50
45 x 45
Rated output in kW
1000
800
700
600
500
400
350
300
230
200
150
100
70
80
40 x 40
35 x 35
30 x 30
27,5 x 27,5
25 x 25
22.5 x 22.5
20 x 20
18 x 18
16 x 16
14 x 14
5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80
Effective height of the flue gas system
PLEWA lining pipes
Internal PLEWA liner 65 m thick
Special PLEWA lining
The diagram shown is also a valid representation for other manufacturers.
The installing contractor should check how far this diagram may
be applied to the flue systems offered by alternative manufacturers.
5822 426 GB
34 VIESMANN OIL/GAS BOILERS

Design information (cont.)
Flue system for condensing boilers
The condensing boiler cools the flue gases, subject to the heating
water return temperature, down into the condensing range. They then
leave the system with a relative humidity of 100 %. Subject to system
conditions, the flue gas temperature can reach up to 110 ºC. The low
flue gas temperature and the resulting low draught plus the additional
condensation of the flue gases inside the flue system make it a necessity
for the flue system manufacturer to calculate the system, which
must also be made from suitable materials.
Also, special requirements apply to the design and installation of the
flue system of condensing combustion systems.
When installing a Vitoradial 300-T in an attic, (type B33 to TRGI 2008),
the flue gas can be routed out as a vertical roof outlet (short-stemmed
chimney) (see stainless steel flue systems in the Vitoset pricelist).
Condensing boilers must be connected to tested and approved flue
pipes. Flue pipes must comply with Building Regulations.
The Vitoradial 300-T condensing boilers may also be connected to
moisture-resistant chimneys. According to DIN EN 13384, the chimney
manufacturer must provide a calculated verification, giving due consideration
to the flue gas values of the boiler (see specification in the
respective datasheet).
The flue pipes must be raised above roof level inside an existing or a
newly constructed chimney (casing without internal pipe). We would
recommend contacting a flue pipe manufacturer during the design
stage because of the size and design of the chimney.
Flue gas temperature sensor
According to the "Guideline for flue pipe approval" point 3.12, only
components which are approved parts of the flue pipe may be connected
to or be incorporated into flue pipes serving condensing boilers.
Therefore, apertures for the installation of flue gas temperature sensors
must be designed by the manufacturer and should be tested
together with the flue pipe. Subsequent drilling and fitting of third
party components is not permitted.
10
Flue system installation options for the Vitoradial 300-T
Open flue operation
A
A
B
3
Routing through a duct (type B 23 to TRGI 2008)
The boiler 1 draws combustion air from the installation room, and
expels flue gas through the flue pipe via the roof (balanced flow).
Connection to a moisture-resistant chimney (MR chimney, type
B 23 , according to TRGI 2008)
The boiler 2 draws combustion air from the installation room and
expels the flue gas through a moisture-resistant chimney via the
roof.
B
C
1 2
Vertical outlet where no duct is available (type B 23 to TRGI 2008)
The boiler 3 draws combustion air from the installation room (attic),
and expels flue gas through the flue pipe via the roof.
A Flue gas
B Secondary ventilation
C Ventilation air
5822 426 GB
Flue system for the Vitoradial 300-T
The flue gases are expelled from the flue system with positive pressure.
The flue system meets the size requirements of the Vitoradial
300-T, is made from suitable materials, and is both tested & CE-designated.
Note
Use special FPM/FKM gasket sets when fitting PPs flue pipes for oil
operation.
Replace the gaskets before installing the flue system. The boiler flue
connections are already equipped with FPM/FKM gaskets.
Before commissioning the heating system, carry out a tightness test
of the entire flue system (incl. boiler flue connection).
Certificate no. 0036 CPD 9184 001
Skoberne
Ostendstr. 1
D-64319 Pfungstadt
According to CE designation in accordance with DIN EN14471, the
plastic flue pipe (PPs) can be utilised up to a max. flue gas temperature
of 120 ºC (type B).
The plastic flue pipes are group B (max. permissible flue gas temperature
120 ºC). Flue pipes in buildings must only be run inside dedicated,
linearly ventilated ducts or channels which meet the requirements
for chimney stacks to DIN 18160-1 (issue December 2001), section
4.4 to 4.9 or provide a fire resistance of 90 minutes (F90/L90) and offer
the stated minimum internal duct dimensions.
OIL/GAS BOILERS VIESMANN 35

Design information (cont.)
At least one inspection aperture for checking and cleaning as well as
for checking the pressure must be provided in the flue system.
If the flue pipe is inaccessible from the roof, a second inspection aperture
must be provided in the attic behind the chimney cleaning hatch.
Safeguard the unhindered return of the condensate from the flue into
the boiler through an appropriate slope of at least 3º.
The flue system must protrude clear of the roof.
Where the flue pipe is to be installed in an existing chimney, seal any
apertures with appropriate materials and clean the inside of the chimney.
This does not apply to any cleaning or test apertures that are provided
with chimney clean-out covers and that are identified with an appropriate
test mark.
Note
A flue gas temperature protection is not required in conjunction with
the Vitoradial 300-T. The flue gas high limit safety cut-out ensures that
the max. permissible flue gas temperature of 120 ºC (flue pipe type B)
is not exceeded.
Subject to duct size, install spacers every 2 to 5 m and at each profiled
piece of the flue pipe (e.g. inspection piece or bend).
Minimum distance for secondary ventilation between the internal
cross-section of the duct and the female connection
10
a
a
System size
External
dimension
(Ø mm)
a b c
rectangular
mm
Minimum internal duct dimension
D
(mm)
d
round
Ø mm
150 184 224 x 224 244
200 227 267 x 267 287
20 b 20
30 b 30
c
d
5822 426 GB
36 VIESMANN OIL/GAS BOILERS

Design information (cont.)
CE designation for the PPs flue gas systems for the Vitoradial 300-T
10
5822 426 GB
OIL/GAS BOILERS VIESMANN 37

Design information (cont.)
Open flue operation with the Vitoradial 300-T
10
A flue pipe between the condensing boiler and the duct, as well as for
routing through the duct (type B23 to TRGI 2008, point 2.3.2), is
required for open flue operation with the Vitoradial 300-T.
For routing through ducts or channels with linear ventilation that
meet the requirements for chimneys to DIN 18160-1 or provide a
fire resistance of 90 min (F90/L90).
D
A
4 6 5
1
B
3
B
C
2
3
4
3
2
3
2
2
System size flue pipe Ø 150 and 200 mm.
A boiler flue connection must be ordered for the connection to the
Vitoradial.
For system size 150 and 200 mm
1 Boiler flue connection
with FPM/FKM gasket
FPM/FKM gasket set
The integral gasket must be replaced
– Set with 2 pce
– Set with 5 pce
– Set with 10 pce
2 Basic duct unit
Comprising:
– Support bend
– Support rail
– Duct cover
– Spacers (3 pce.)
Spacers (3 pce.)
3 Flue pipe
2 m long
1 m long
0.5 m long
4 Inspection piece, straight
5 Ventilation bezel
Flue bend
87° or 2 x 45°
Flue bend (for use in corbelled chimneys)
2 x 30° or 2 x 15°
6 Inspection bend, 87°
A Secondary ventilation
B Flue gas
C Inspection aperture
D Ventilation/ventilation aperture
Max. total length of the flue up to the boiler flue connection
Rated output
– T V /T R = 50/30 °C kW 101 129 157 201 263 335
Max. length
– System size 150 m 30 30 23 — — —
– System size 200 m — — 30 30 30 22
Rated output
– T V /T R = 80/60 °C kW 94 120 146 188 245 313
Max. length
– System size 150 m 30 30 30 — — —
– System size 200 m — — — 30 30 30
Individual components of the plastic flue system
Basic duct element
(comprising)
5822 426 GB
38 VIESMANN OIL/GAS BOILERS

Design information (cont.)
Support bend
Ø a
A
System size Dimension [mm]
7 mm a b c d e
150 184 160 137 296 163
200 227 200 153 490 310
d
Ø b
c
10
e
A System size 150 or 200
Support rail
400
20
Ø 10.5
50
50
25
50
5822 426 GB
OIL/GAS BOILERS VIESMANN 39

Design information (cont.)
Duct cover
(Fixing material for securing the duct cover on the cover plate is part
of the standard delivery)
Ø a
System size
Dimension [mm]
7 mm a b c d
150 161 228 258 350
200 202 260 261 280
c
Ø b
□ d
10
Spacers (3 pce)
System size
Dimension [mm]
7 mm a
150 402
200 734
a
Pipe
Pipe, 2 m long (2 pce)
Pipe, 2 m long (1 pce)
Pipe, 1 m long (1 pce)
Pipe, 0.5 m long (1 pce)
(These pipes may be shortened if required)
a
500/1000/2000
System size
Dimension [mm]
7 mm a b c
150 83 160 184
200 122 200 227
Ø c
A
Ø b
A System size 150 or 200
5822 426 GB
40 VIESMANN OIL/GAS BOILERS

Design information (cont.)
Plain inspection piece (straight)
a
b
System Dimension [mm]
size
7 mm a b c d
150 83 225 160 184
200 122 300 200 227
Ø d
A
Ø c
A System size 150 or 200
Simple bend (87º)
87°
a
System size Dimension [mm]
7 mm a b c d e
150 83 184 160 170 170
200 122 227 200 350 310
10
Ø b
d
A
Ø c
e
A System size 150 or 200
Simple bend (45º)
a
Ø b
System size
Dimension [mm]
7 mm a b c
150 83 184 160
200 122 227 200
A
45°
Ø c
5822 426 GB
A System size 150 or 200
Simple bend (30º)
Simple bend (15º)
OIL/GAS BOILERS VIESMANN 41

Design information (cont.)
Ventilation bezel
30
30
40
300
System size
Dimension [mm]
7 mm a
150 160
200 200
Ø d
300
A
2.5
5
10
A Spacers
Inspection bend (87°)
Ø c
Ø a
System size Dimension [mm]
7 mm a b c d e
150 100 160 184 163 159
200 100 200 227 310 350
d
e
Ø b
A System size 150 or 200
Boiler flue connection (order separately)
Ø d
Ø a
c
b
Boiler flue connection 200/150
5822 426 GB
42 VIESMANN OIL/GAS BOILERS

Design information (cont.)
Boiler flue Dimension [mm]
connection
7 mm a b c d
200/150 200 150 270 184
200/200 200 — 270 227
Ø d
Ø a
c
Boiler flue connection 200/200
A Test port
B Optional connection for a flue gas high limit safety cut-out
Connecting a plastic flue pipe (PPs) to a moisture-resistant chimney (MR chimney, negative pressure)
10
1 Boiler flue connection
2 Flue pipe
2 m long
1 m long
0.5 m long
3 Inspection piece, straight
or inspection bend 4
4 Inspection bend, 87°
or inspection piece, straight 3
A Plug-in adaptor by Schiedel
B Plewa adaptor
C Flue gas
D Secondary ventilation
E MR chimney
F Inspection aperture
5822 426 GB
Vitoradial 300-T condensing boilers may be connected to a moistureresistant
chimney, if the chimney manufacturer can provide a calculated
verification to DIN EN 13384.
A flue pipe that is pressure sealed and moisture-resistant in accordance
with Building Regulations should be used as connecting piece.
Plewa or Schiedel (quoting reference "Schiedel Steck-Adapter") supply
this adaptor from the flue pipe to the MR chimney upon request.
OIL/GAS BOILERS VIESMANN 43

Design information (cont.)
Addresses:
Plewa-Werke GmbH
54662 Speicher/Eifel
Schiedel GmbH & Co.
Hauptverwaltung
Lerchenstraße 9
80995 München
10
10.8 Sound insulation
The burner/boiler systems, circulation pumps and other drives used in
heating systems generate noise. This noise is transferred from the
installation room via floorboards, ceiling and walls to adjacent rooms
and via the flue system as well as the ventilation air and extract air
apertures into other rooms and into the open,
Attenuating airborne noise
Frequently, modern boilers are equipped with silencer hoods or noiseattenuated
ventilation air inlet housings. Additional silencer hoods may
be used where more stringent anti-noise measures are required.
These measures may be implemented later with minimum effort.
Silencer hoods are offered for various levels of noise attenuation and
are generally designed and built in accordance with specific system
conditions (boiler type, fuel supply, building characteristics).
For larger systems it may be necessary to route the ventilation air
through a sound-insulated channel, in order to avoid excess noise
outside the building.
Flue gas silencers are generally only required where higher noise protection
measures are called for. Whether or not a flue gas silencer is
required can be predicted only with some difficulty, because of the
complexity of the creation and propagation of flame noise, the interaction
between the burner, boiler and the flue system as well as the
operating mode (flue system operating with positive or negative pressure).
Attenuating structure-borne noise
Anti-vibration supports for the boiler are an economical and effective
measure to reduce vibrations. For this purpose, adjustable anti-vibration
feet for insertion into the boiler base frame and linear anti-vibration
brackets for boilers with higher rated output made from stainless spring
steel are available.
Consider the total operating weight of the boiler system when sizing
such supports. Ensure the support surface is level when using linear
anti-vibration brackets.
Effective anti-vibration measures are particularly important when
installing boilers in attics. Compensators may be used to physically
separate the combustion equipment from the building.
Noise attenuating accessories
Viessmann offers the following anti-vibration accessories for boilers:
where it may cause a nuisance. To avoid this happening, additional
protective measures may be required which should be considered at
the design stage. Subsequent measures to reduce noise development
frequently require extensive effort and expenditure.
It is advisable, therefore, to assess the noise emission into the neighbourhood
in considering the sound power level measured at the flue
system outlet. It should be considered at the planning stage whether
silencers might become necessary later. It is thus important that sufficient
space for the flue gas silencer is available behind the boiler. In
accordance with EN 13384, the pressure drop of the flue gas silencer
on the flue gas side will be required for calculating the flue system.
These should be installed as near as possible to the boiler in the flow,
return and safety pipes. Also insulate any braces or hanging arrangements,
if installed, against sound/vibration transmission to the building.
Detailed information for reducing noise emissions by combustion
equipment in heating systems can be found in the Information Sheet
No. 10 of the BDH (Bundesindustrieverband Deutschland Haus-,
Energie- und Umwelttechnik e.V.).
■ Adjustable anti-vibration feet for boilers up to 560 kW
■ Anti-vibration boiler supports for boilers from 300 kW
10.9 Standard values for water quality
The service life of any boiler as well as that of the complete heating
system is influenced by the quality of the water.
In any event, the cost of a water treatment facility is less than the cost
of repairing defects on your heating system.
Maintaining the following requirements is necessary to safeguard your
warranty rights. The manufacturer's warranty excludes damage due to
corrosion and scaling.
The following is a summary of essential water qualities.
A chemical water treatment can be ordered from Viessmann for filling.
Heating systems with rated operating temperatures up to 100 ºC (VDI 2035)
For heating systems, used water must meet the chemical levels of the
Drinking Water Ordinance [Germany]. If well water or similar is used,
it should be tested for suitability before filling the system.
5822 426 GB
44 VIESMANN OIL/GAS BOILERS

Design information (cont.)
Prevent excessive scale build-up (calcium carbonate) on the heating
surfaces. For heating systems with operating temperatures up to
100 °C, the VDI Directive 2035 sheet 1 "Prevention of heating system
damage in hot water heating systems - scaling in DHW and hot water
heating systems" applies [in Germany; check local regulations] with
the following guide values. For more detailed information, see the
annotations to VDI Directive 2035.
Total output in kW > 50 to ≤ 200 > 200 to ≤ 600 > 600
Total alkaline
≤ 2.0 ≤ 1.5 < 0.02
earths in mol/m 3
Total hardness in °dH ≤ 11.2 ≤ 8.4 < 0.11
The standard values assume the following:
■ The volume of fill and top-up water of the heating system during its
service life will not exceed three times the water content of the heating
system.
■ The specific system volume is less than 20 l/kW output. In multiboiler
systems, apply the output of the smallest boiler.
■ All measures to prevent corrosion on the water side in accordance
with VDI 2035 Sheet 2 have been implemented.
Soften the fill & top-up water in heating systems operating under the
following conditions:
■ The total of alkaline earths in the fill & top-up water exceeds the
standard value.
■ Higher fill & top-up water volumes are expected.
■ The specific system volume is higher than 20 l/kW output. In multiboiler
systems, apply the output of the smallest boiler.
When engineering the system, observe the following:
■ Install shut-off valves in different sections. This prevents the need
for draining the entire heating water in case of repairs or system
expansion.
■ Install a water meter to record the amount of the fill & top-up water.
Enter the volume of water and the water hardness into the boiler
service instructions.
■ For systems with a specific system volume in excess of 20 l/kW output
(for multi-boiler systems, apply the output of the smallest boiler),
apply the requirements of the next highest category of total output
(in accordance with the table). In case of severe excess (> 50 l/kW),
soften down to the total of alkaline earths ≤ 0.02 mol/m 3 .
Operating information:
■ Bring the system into use step by step, starting with the lowest boiler
output and at a high heating water flow rate. This prevents a localised
concentration of lime deposits on the boiler heating surfaces.
■ In multi-boiler systems, start all boilers simultaneously to prevent the
entire lime deposit settling in the heat transfer area of just one boiler.
■ During expansion or repair work, only drain the necessary sections.
■ Where water treatment is required, treat even the first fill of the heating
systems prior to commissioning. This also applies to any subsequent
filling, e.g. when adding top-up water or after a repair or after
system expansion.
■ Filters, dirt traps and other blow-down or separating facilities in the
heating water circuit must be checked, cleaned and activated more
frequently after commissioning or recommissioning, and later on as
required, subject to the water treatment applied (e.g. water softening).
The build-up of lime deposits on the heating surfaces will be minimised
if these instructions are observed.
Any lime deposits that have formed because the requirements to VDI
Guideline 2035 have not been observed will in most cases already
have caused a reduction in the service life of the installed heating
equipment. Removing the lime deposits is one option to restore the
operational viability. This measure must be carried out by the
Viessmann industrial services or a specialist company. Inspect the
heating system for possible damage prior to returning it into use. It is
essential that the faulty operating parameters are corrected to prevent
renewed formation of excessive scale deposits.
10
Heating systems with permissible flow temperatures in excess of 100 ºC (VdTÜV DS 1466)
Operation with circulating water with low salt content
Only use water with a low salt content as fill or top-up water, such as
desalinated water, permeate or condensate.
Systems using mixed condensate generally create water with low salt
content if no boiler water is fed into the system for putrefaction by
alkalis.
Operation with saline water
Where possible, use water with a low salt content that is at least free
from alkaline earths (softened) as fill or top-up water.
5822 426 GB
OIL/GAS BOILERS VIESMANN 45

Design information (cont.)
Low salt content With salt content
El. conductivity at 25 °C μS/cm 10 to 30 > 30 to 100 > 100 to 1500
General requirements clear, without sediments clear, without sediments clear, without sediments
pH value at 25 ºC 9 - 10 9 - 10.5 9 - 10.5
According to the Drinking Water Ordinance/
Drinking Water Treatment Ordinance [Germany]
≤ 9.5 ≤ 9.5 ≤ 9.5
Oxygen (O 2 )
mg/litre < 0.1 < 0.05 < 0.02
Values for constant operation may be significantly
lower. The oxygen concentration in the recirculated
water may be up to 0.1mg/litre, if suitable
inorganic corrosion inhibitors are used.
Alkaline earths (Ca + Mg) mmol/litre < 0.02 < 0.02 < 0.02
Phosphate (PO 4 ) mg/litre < 5 < 10 < 15
According to the Drinking Water Ordinance/
Drinking Water Treatment Ordinance [Germany]
mg/litre ≤ 7 ≤ 7 ≤ 7
10
For Viessmann hot water boilers mg/litre < 2.5 < 5 < 15
When using oxygen binders:
Sodium sulphite (Na 2 SO 3 )
When using suitable products, observe the
guidelines issued by the respective supplier.
mg/litre – – < 10
Using antifreeze in boilers
Viessmann boilers are designed and built for water as a heat transfer
medium. To protect boiler systems from frost, it may be necessary to
treat the boiler or circuit water with antifreeze.
When doing so, observe the following:
■ The properties of antifreeze and water are very different.
■ The boiling point of pure antifreeze based on glycol is approx. 170
°C.
■ The temperature stability of the antifreeze must be sufficient for the
particular application.
■ Check the compatibility with sealing materials. If other sealing materials
are used, take this into account when designing the system.
■ Antifreeze developed especially for heating systems contains inhibitors
and buffer substances for corrosion protection as well as glycol.
When using antifreeze, always observe the manufacturer's instructions
regarding minimum and maximum concentrations.
■ In a water/antifreeze mixture, the specific heat capacity of the heat
transfer medium changes. Take this factor into account when selecting
the boilers and system components, such as heat exchanger and
pumps. Contact the antifreeze manufacturer to find out the relevant
values for the specific heat capacity. For an example calculation of
the output change, see below.
■ If the system is filled with antifreeze, it must be marked accordingly.
■ The quality of the boiler and feedwater must meet the requirements
of VDI guideline 2035.
■ The systems must be designed as sealed unvented systems, as the
antifreeze inhibitors decrease rapidly if airborne oxygen is allowed
to enter.
■ Diaphragm pressure compensation vessels must comply with DIN
4807.
■ Only use oxygen diffusion-resistant hoses or metal hoses for flexible
connections.
■ Never install zinc plated heat exchangers, tanks or pipes on the primary
side of a system, as zinc can be stripped by glycol/water mixtures.
Due to the different physical characteristics of glycol and water, the boiler may suffer a loss of output. Below we have given an example for
calculating the output change for operation with antifreeze.
Target Maximum boiler output when using antifreeze Q K glycol
Given Boiler output Q K = 2 MW
Antifreeze
Tyfocor
Spec. heat capacity 3.78 kJ/kgK at 80°C
Mixing ratio Tyfocor/water 40/60
Calculation:
µ =
² 2000 kW kg K•3600s
kg
=
= 86000
c • Δt 4.187 kWs•20K •1h h
≙
86 t/h
This results in the following:
´ ≈ 86 m 3 /h
² K glycol = µ • c • Δt =
86000 kg
kJ
1h
• 3.78 • 20K •
h h 3600s
5822 426 GB
46 VIESMANN OIL/GAS BOILERS

Design information (cont.)
² K glycol = 1.8 MW
Result:
When using 40 % of the antifreeze named above in the heating network, the boiler output is reduced by 10 %.
The specific heat capacity is subject to the mixing ratio and temperature, therefore each system must be designed individually.
Prevention of damage through corrosion on the water side
The corrosion resistance of ferrous materials on the heating water side
of heating systems and boilers depends on the absence of oxygen in
the heating water.
The oxygen introduced into the heating system with the first fill and the
top-up water reacts with the system materials without causing damage.
The characteristic blackening of the water after some time in use indicates
that free oxygen is no longer present.
The technical rules and in particular VDI Directive 2035-2 therefore
recommend that heating systems are designed and operated so that
a constant ingress of oxygen into the heating water is prevented.
Opportunities for oxygen ingress during the operation:
■ Through overflowing open expansion vessels
■ Through negative pressure in the system
■ Through gas-permeable components
Sealed unvented systems, e.g. with a diaphragm expansion vessel,
offer good protection against the ingress of airborne oxygen into the
system, if correctly sized and operating at the correct pressure.
At every part of the heating system, even at the suction side of the
pump and under all operating conditions, the system pressure should
be above ambient atmospheric pressure.
The pre-charge pressure of the diaphragm expansion vessel should
be checked at least during the annual service.
The use of permeable components, e.g. plastic pipes that are permeable
to gas in underfloor heating systems, should be avoided. Provide
system separation if such components are nevertheless used. This
must separate the water flowing through the plastic pipes from other
heating circuits, e.g. from the heat source, by the provision of a heat
exchanger made of corrosion-resistant material.
No further anti-corrosion measures are required for sealed hot water
heating systems subject to the above points being observed.
However, take additional precautions where there is a risk of oxygen
ingress, for example by adding oxygen binder sodium sulphite (5 - 10
mg/litre into the excess). The heating water should have a pH value
between 9.0 and 10.5.
Different conditions apply to systems that contain aluminium components.
Where chemicals are used as part of the corrosion protection, we recommend
that the manufacturer of the chemicals issues a certificate of
suitability of the additives with regard to the boiler materials and the
materials of the other heating equipment components.
We recommend you refer questions of water treatment to Viessmann
industrial services or an appropriate specialist.
Further details can be found in VDI Directive 2035-2 and EN 14868.
10
5822 426 GB
10.10 Vitotrans 300 flue gas/water heat exchanger
Downstream installation of a Vitotrans 300 flue gas/water heat exchanger for raising the efficiency
The installation of a Vitotrans 300 flue gas/water heat exchanger
downstream of a boiler significantly raises the efficiency. By condensing
the flue gases inside the heat exchanger, the boiler turns into a
condensing boiler, as required by the Efficiency Directive 92/42/
EEC.
■ In the case of gas boilers, efficiency is increased by up to 12 %.
■ When using fuel oil EL, efficiency is raised by up to 6 % due to the
lower water content and, compared to gas, the lower dew point.
The Vitotrans 300 flue gas/water heat exchangers are designed to
enable retrofitting in existing heating systems.
Vitotrans 300 for oil operation
The Vitotrans 300 flue gas/water heat exchangers are available with
surfaces, which are in contact with flue gas, made from high-grade
stainless steel 1.4539 to enable constant or prolonged operation with
fuel oil EL.
Specification
See the datasheet for the relevant boiler.
Energy savings from using a Vitotrans 300 flue gas/water heat exchanger in conjunction with Vitoplex and
Vitorond boilers
The increase in efficiency and therefore the energy savings compared
to systems without flue gas/water heat exchangers are significantly
influenced by the return temperature of the return water flowing
through the heat exchanger.
The return temperatures are influenced by the system size and reduce
with increasing outside temperature. For heating systems with design
temperatures of 75/60 ºC and 40/30 ºC, the development of the return
temperature in relation to the outside temperature is illustrated in the
diagram on page 48.
Heating system design temperature
Increase in efficiency
through the Vitotrans 300 with a Vitoplex 300
90/70 ºC 6.0 % 7.0 %
75/60 ºC 9.0 % 10.0 %
60/50 ºC 10.0 % 11.0 %
40/30 ºC 11.5 % 12.5 %
The increased efficiency achievable through the downstream flue gas/
water heat exchanger when operating with gas and at various heating
system temperatures, is shown in the following table. The feasible
increases in efficiency are based on the modulating development of
the return temperature, and are subject to outside temperature. The
various increases in efficiency result from the different flue gas temperatures
produced by the upstream boiler.
Increase in efficiency
through the Vitotrans 300 with a Vitoplex 200 and
Vitorond 200
OIL/GAS BOILERS VIESMANN 47

Design information (cont.)
The overall efficiency for the condensing unit, comprising the gas boiler
and the Vitotrans 300 flue gas/water heat exchanger results from adding
the boiler efficiency and the increase in efficiency as a result of the
heat exchanger, which has been calculated for the respective system
temperature.
Example:
Efficiency Vitoplex 300 = 96 %
The increase in efficiency resulting from the Vitotrans 300 at 75/60 ºC =
9 % leads to a total efficiency for the condensing unit of
96 % + 9 % = 105 %.
10
Heating water temperature in °C
80
60
A
B
40
C
D
20
+15 +10 +5 0 -5 -10 -15
Outside temperature in °C
A Flow temperature for heating systems 75/60 ºC
B Return temperature for heating systems 75/60 ºC
C Flow temperature for heating systems 40/30 ºC
D Return temperature for heating systems 40/30 ºC
Calculation of possible energy savings (B E )
■ Annual heating load Q a of a boiler system with ² k = 500 kW and 1650
full utilisation hours (b a ) p.a.:
Q a = b a · Q k = 1650 h/a · 500 kW
= 825000 kWh/a
■ Annual consumption B N of natural gas LL (calorific value H u =
8.83 kWh/m 3 ) when using a Vitoplex 300 low temperature boiler with
a standard seasonal efficiency [to DIN] of η N = 96 %:
■ Savings in natural gas LL in m 3 /p.a.:
B E = B N – B B = 97320 m³/a – 88980 m³/a
= 8340 m³/a
■ Savings in percent:
8340 · 100
97320
= 8.5%
Q a
B N = ηN · H u
= 97320 m³/a
825000 kWh/a
=
0.96 · 8.83 kWh/m³
Using a downstream Vitotrans 300 flue gas/water heat exchanger can
achieve fuel savings of approx. 8.5 %. Substantially higher savings are
realised when modernising an out-dated boiler system with low efficiency
rates.
■ Increase in efficiency η AWT through the downstream installation of a
Vitotrans 300 flue gas/water heat exchanger. The design temperature
of the heating system routed through the heat exchanger is
75/60 ºC.
η AWT = 9 % (according to table on page 47)
η ttl = η N + η AWT = 96 % + 9 % = 105 %
■ Annual consumption B B of natural gas LL (net calorific value H u =
8.83 kWh/m 3 ) when using a Vitoplex 300 with a Vitotrans 300 flue
gas/water heat exchanger installed downstream of the boiler:
Q a 825000 kWh/a
B B = = ηges · H u 1.05 · 8.83 kWh/m³
= 88980 m³/a
Hydraulic connection
The entire heating water flow rate, relative to the rated boiler output
and a minimum temperature differential of 20 K can be routed through
the Vitotrans 300 flue gas/water heat exchanger.
If a partial volume flow is directed via the Vitotrans 300, e.g. in order
to use a heating circuit with lower return temperatures, the rated volume
flow should be selected so that the temperature range in the
Vitotrans 300 is relative to the upper output of max. 10 K.
5822 426 GB
48 VIESMANN OIL/GAS BOILERS

Design information (cont.)
Condensate and neutralisation
Oil combustion
Condensate from this type of system should be neutralised. For gas
boilers use an active carbon filter in addition to a neutralising system.
Neutralising system
Matching neutralising systems are available for condensing units
comprising Viessmann Vitoplex/Vitorond boilers and Viessmann
Vitotrans 300 flue gas/water heat exchangers installed downstream
of the boiler:
Positioning the neutralising system
The condensate backs up to the level of the inlet connection to the
neutralising system in the heat source, in the flue gas heat exchanger
or in the flue system, if the entire heating system is installed at the
same level.
■ Granulate neutralising facility for gas boilers up to 500 kW incl.
Vitotrans 300
■ Granulate neutralising system with lifting pump and granulate re-fill
indicator for gas boilers up to 1000 kW incl. Vitotrans 300
■ Liquid neutralising system for gas boilers from 1000 kW incl.
Vitotrans 300
■ Neutralising systems for oil boilers incl. Vitotrans 300.
For specifications regarding neutralising facilities or systems, see the
datasheet "Boiler accessories".
Position the neutralising system correspondingly lower, if the condensate
is to drain off completely.
Control units
11.1 Overview of boiler control units and control panels
(See pricelist for allocation to the boilers)
A specific, matching boiler control unit is part of the standard delivery
of the Viessmann boilers Vitoplex 200 and 300 as well as
Vitorond 200. This ensures that the required low-end boiler water temperature
is maintained.
The boiler protection is assured by the following:
■ Therm-Control (only Vitoplex 200 to 560 kW, Vitoplex 300 and
Vitorond 200, type VD2A, to 270 kW and Vitoradial 300-T)
■ Controlling a shunt pump, boiler circuit pump or distribution pump
■ Flow rate reduction in the heating circuits
■ Constant return temperature control
Vitocontrol control panels with weather-compensated control unit
Vitotronic 300-K, type MW1S, for 1 to 4 boilers and 2 heating circuits
with mixers, and additional Vitotronic 200-H, type HK1S or HK3S, for
1 or up to 3 heating circuits with mixers, can be supplied for all Vitoplex
and Vitorond boilers.
11
5822 426 GB
OIL/GAS BOILERS VIESMANN 49

Control units (cont.)
Single boiler systems
Vitotronic 100, type GC1
11
Electronic boiler control unit
■ For constant boiler water temperature
or
Weather-compensated operation in conjunction with the Vitocontrol
control panel and integral heating circuit control unit Vitotronic 200-
H, type HK1S/HK3S (see separate datasheet)
or
Weather-compensated operation in conjunction with an external
control unit
■ For two-stage or modulating burners, if installed
■ With cylinder thermostat
or
Control of a primary store system with mixer assembly (only available
as an alternative to the control of a constant return temperature
raising facility with a regulated three-way valve)
■ With boiler protection function subject to boiler version:
– Therm-Control
– Shunt pump
– Control of a constant return temperature raising facility with a
regulated three-way valve (only available as an alternative to the
control of a primary store system with mixer assembly)
■ With integral diagnostic system
■ Function extension (accessories):
To default an additional set boiler water temperature via 0 – 10 V
input
■ Via external contacts:
– Requirement to default set boiler water temperature
– Switching ON burner stages 1 and 2
– Changeover stepped/modulating operation
■ With capability to communicate via LON (order a LON communication
module separately)
According to the Energy Savings Order [Germany], a weather-compensated
or room temperature-dependent control unit with time program
for reduced mode must be installed downstream.
Vitotronic 200, type GW1
Weather-compensated, digital boiler control unit
■ For single boiler systems
■ For two-stage or modulating burners, if installed
■ With time switch with individual and seven-day programs
■ With plain text programming unit
■ With separately adjustable periods
■ With cylinder thermostat
or
Control of a cylinder primary system with mixer assembly (only available
as an alternative to the control of a constant return temperature
raising facility with a regulated three-way valve)
■ With boiler protection function subject to boiler version:
– Therm-Control
– Shunt pump
– Control of a constant return temperature raising facility with a
regulated three-way valve (only available as an alternative to the
control of a cylinder primary system with mixer assembly)
■ With integral diagnostic system
■ A function extension to default the set boiler water temperature via
a 0 - 10 V input can be connected (accessories).
■ Via external contacts:
– Heating program changeover
– Requirement to default set flow temperature
– Blocking the burner
– Changeover stepped/modulating operation
■ With capability to communicate via LON (order a LON communication
module separately)
50 VIESMANN OIL/GAS BOILERS
5822 426 GB

Control units (cont.)
Vitotronic 300, type GW2
M
M
Weather-compensated, digital boiler and heating circuit control unit:
■ For single boiler systems
■ For one system circuit and up to two heating circuits with mixer (a
maximum of 32 Vitotronic 200-H heating circuit control units can be
connected via the LON BUS)
An extension kit is required for each heating circuit with mixer.
■ For two-stage or modulating burners
■ With cylinder thermostat
or
Control of a primary store system with mixer assembly (only available
as an alternative to the control of a constant return temperature
raising facility with a regulated three-way valve)
■ With boiler protection function subject to boiler version:
– Therm-Control
– Shunt pump
– Control of a constant return temperature raising facility with a
regulated three-way valve (only available as an alternative to the
control of a primary store system with mixer assembly)
■ With integral diagnostic system
■ Programming unit with plain text prompts
■ Function extension (accessories):
To default an additional set boiler water temperature via 0 – 10 V
input
■ Via external contacts:
– Heating program changeover
– Requirement to default set boiler water temperature
– Blocking the burner
– Mixer "Open" or "Closed"
■ With capability to communicate via LON (order a LON communication
module separately)
11
Multi-boiler systems
Every boiler in a multi-boiler system should be equipped with a
Vitotronic 100 (type GC1). The Vitotronic 300-K (type MW1) is supplied
with one boiler (see pricelist) and should be installed separately.
The LON communication module must be fitted into the Vitotronic 100.
See pricelist.
In multi-boiler systems with external control unit, the load-dependent
burner and boiler control as well as the cylinder thermostat must be
implemented by the overriding (external) control unit.
5822 426 GB
OIL/GAS BOILERS VIESMANN 51

Control units (cont.)
Vitotronic 100, type GC1
11
Vitotronic 300- K
M
M
Electronic boiler control unit
■ For every boiler in a multi-boiler system with the Vitotronic 300-K,
type MW1 (Viessmann cascade control unit, supplied with one
boiler)
or
for every boiler in a multi-boiler system
– with Vitocontrol control panel and integral weather-compensated
cascade control unit Vitotronic 300-K, type MW1S,
or
– with external, weather-compensated cascade control unit with cylinder
thermostat
■ For two-stage or modulating burners, if installed
■ With boiler protection function subject to boiler version:
– Therm-Control
– Shunt pump
– Control of a constant return temperature raising facility with a
regulated three-way valve
■ With integral diagnostic system
■ With capability to communicate via LON (LON communication module
and connecting cables for control unit data exchange are part of
standard delivery)
■ For operation with the Vitotronic 300-K via external contacts:
– Boiler blocking
– Start boiler as the last one in the boiler sequence
■ For operation with external, weather-compensated cascade control
unit:
– Via 0 – 10 V input of the function extension (accessory):
Defaulting an additional set boiler water temperature
and
Enable boiler
or
– Via external contacts:
Enable boiler
and
Switching the burner stages
or
– With capability to communicate via LON (order a LON communication
module separately)
5822 426 GB
52 VIESMANN OIL/GAS BOILERS

Control units (cont.)
Vitotronic 300-K, type MW1
Vitotronic 300- K
M
M
Weather-compensated, digital cascade and heating circuit control unit:
■ Type MW1S: For installation in control panels (see separate datasheet).
■ For multi-boiler systems
■ With sequential boiler strategy
■ For up to two heating circuits with mixer (a further 32 Vitotronic 200-
H heating circuit control units can be connected via the LON).
An extension kit (accessory) is required for each heating circuit with
mixer
■ In conjunction with the Vitotronic 100, type GC1:
For two-stage or modulating burners, if installed
■ With cylinder thermostat
or
Control of a cylinder primary system with mixer assembly (only available
as an alternative to the control of a constant return temperature
raising facility with a regulated three-way valve)
■ With boiler protection functions subject to system version:
– Distribution pump
or
– Shunt pump
or
– Control of a constant return temperature raising facility with a
regulated three-way valve (only available as an alternative to the
control of a cylinder primary system with mixer assembly)
■ With integral diagnostic system
■ Programming unit with plain text prompts
■ Via external contacts:
– Heating program changeover
– Requirement to default set flow temperature
– Blocking the burner
– Mixer "Open" or "Closed"
■ With capability to communicate via LON (LON communication module
and terminators are part of the standard delivery)
11
Switching points
Flow temperature in °C
110
100
A
90
80
75
70
60
F
50
40
30 C
20
10
+20 +15 +10 +5 0 -5
Outside temperature in °C
B
-10
DE
G
-15 -20
A Setting options for the high limit safety cut-out of the Vitotronic
boiler control units (delivered condition 110 ºC)
B Setting options of the control thermostat of the Vitotronic boiler
control units (delivered condition 95 ºC)
C Low-end boiler water temperature (see operating conditions
page 5 to 11)
D Burner starting points
E Burner shutdown points
F Selected heating curve
G Set maximum boiler water temperature
5822 426 GB
11.2 Components in the delivered condition
Allocation to control unit types
Vitotronic 100 200 300 300-K
Type GC1 GW1 GW2 MW1 MW1S
Components
Boiler water temperature sensor x x x
Cylinder temperature sensor x x x x
Outside temperature sensor x x x x
Contact temperature sensor (see accessories)
x
x
OIL/GAS BOILERS VIESMANN 53

Control units (cont.)
Vitotronic 100 200 300 300-K
Type GC1 GW1 GW2 MW1 MW1S
Components
LON communication module (see
accessories)
x x x
Note
for Vitotronic 100, type GC1, only in
multi-boiler systems
LON cable (see accessories) x x
Terminator (see accessories) x x
Boiler water temperature sensor
Specification
Lead length
Protection
Permissible ambient temperature
– during operation 0 to +130 °C
– during storage and transport -20 to +70 °C
3.7 m, fully wired
IP 32 to EN 60529; safeguard
through appropriate design
and installation
Cylinder temperature sensor
11
Specification
Lead length
IP rating
5.8 m, fully wired
IP 32 to EN 60529; ensure
through appropriate design
and installation
Viessmann Pt500
Sensor type
Permissible ambient temperature
– during operation 0 to +90 °C
– during storage and transport –20 to +70 °C
Outside temperature sensor
Installation location:
■ North or north-western wall of the building
■ 2 to 2.5 m above the ground, for multi-storey buildings in the upper
half of the second floor
Connection:
■ 2-core lead, length up to 35 m with a cross-section of 1.5 mm 2 (copper).
■ Never route this lead immediately next to 230/400 V cables
Specification
IP rating IP 43 to EN 60529;
ensure through appropriate
design/installation
Sensor type
Viessmann Ni500
Permissible ambient temperature during
operation, storage and transport -40 to +70 °C
80
41
66
11.3 Vitotronic 100, type GC1, part no. 7248 083
Specification
Construction
The control unit comprises a standard unit, electronic modules and a
programming unit.
Standard unit:
■ ON/OFF switch
■ TEST key
■ Emissions test switch
5822 426 GB
54 VIESMANN OIL/GAS BOILERS

Control units (cont.)
■ Optolink laptop interface
■ Temperature controller
DIN TR 77708
or
DIN TR 96808
■ High limit safety cut-out
DIN STB 116907
or
DIN STB 98108
■ Operation and fault displays
■ Plug connection chamber
– Connection of external equipment via a system plug
– Connection of three-phase consumers via additional contactors
Programming unit:
■ Display of temperatures and faults
■ Setting of codes via the programming unit display
■ Keys:
– Program selection
– Boiler water and DHW temperature
Functions
■ Control of the boiler water temperature (= system flow temperature)
to the preset value
■ Electronic maximum and minimum temperature limit
■ Anti-seizing pump protection
■ Integral diagnostic system
■ Flue gas temperature monitoring with flue gas temperature sensor
■ Maintenance display
■ Only for single boiler systems:
– Adaptive cylinder thermostat with priority control (heating circuit
pump OFF)
– Auxiliary function for DHW heating (short-term heating to a higher
temperature)
– Control of a primary store system with mixer assembly (only available
as an alternative to the control of a constant return temperature
raising facility with a regulated three-way valve)
■ Optional connection of external fault messaging
■ With boiler protection function subject to boiler/system version:
– Therm-Control start-up system
– Shunt pump control
– Control of a constant return temperature raising facility with a
regulated three-way valve (only available as an alternative to the
control of a primary store system with mixer assembly)
Control characteristics
■ P-characteristics with two-point output when using a burner with
multiple stages
PI characteristics with three-point output for modulating burners, if
installed
■ Thermostat for limiting the max. boiler water temperature:
95 °C, adjustable to 100 °C
■ Adjusting the high limit safety cut-out:
110 °C, adjustable to 100 °C
■ Set boiler water temperature setting range:
20 up to 100 °C (lower switching point subject to boiler/boiler coding
card)
■ Range of the set DHW temperature:
10 to 60 °C; can be changed to 10 to 95 °C
Boiler coding card
For matching to the boiler (supplied with the boiler).
Setting heating programs
The frost protection of the boiler and DHW cylinder applies to all heating
programs.
You can select the following operating programs with the program
keys:
■ For single boiler systems
– Heating and DHW
– Only DHW
– Standby mode
■ On multi-boiler systems
– Heating and DHW
– Standby mode
Summer mode
(Only for single boiler systems; "DHW only")
The burner starts only when the DHW cylinder needs reheating (controlled
by the cylinder thermostat).
The respective low-end boiler water temperature of each boiler is
maintained if necessary.
External demands
(in conjunction with external control units)
■ Boiler enable/butterfly valve control
■ Starting burner stage 1
■ Starting burner stages 1 and 2
A zero volt contact must be provided for each demand.
Specification
Rated voltage 230 V~
Rated frequency
50 Hz
Rated current
2 x 6 A
Power consumption
10 W
Protection class
I
IP rating IP 20 D to EN 60529;
ensure through appropriate
design/installation
Function
Type 1B to
EN 60 730-1
Permissible ambient temperature
– during operation 0 to +40 °C
Installation in living
spaces or boiler rooms
(standard ambient conditions)
– during storage and transport -20 to +65 °C
Rated capacity of the relay outputs
sÖ Switching output 4(2) A, 230 V~
sA Circulation pump for cylinder heating
4(2) A, 230 V~
sL Shunt pump
4(2) A, 230 V~
or
Boiler circuit pump
gÖ Central fault message 4(2) A, 230 V~
gS Butterfly valve
or
Mixer motor constant return temperature
control
or
Motor, 3-way mixing valve, primary
store system 0.2(0.1) A, 230 V~
Total sÖ, sA, sL, gÖ, gS max. 6 A, 230 V~
fA Burner 4(2) A, 230 V~
lÖ Burner, two-stage 1(0.5) A, 230 V~
lÖ Burner, modulating, if installed 0.2(0.1) A, 230 V~
11
5822 426 GB
OIL/GAS BOILERS VIESMANN 55

Control units (cont.)
Delivered condition
■ Boiler water temperature sensor
■ 1 bag with technical documentation
■ Only for multi-boiler systems:
– LON communication module and connecting cable for the data
exchange between control units
Heating system with DHW cylinder
Order separately; single boiler systems only:
■ Cylinder temperature sensor and circulation pump with check valve
for regulating the cylinder temperature
or
■ Vitotrans 222 primary store system with mixer assembly and cylinder
temperature sensor
Communication
The LON communication module (accessory) is required for communication
with other control units, e.g. with the Vitotronic 200-H.
11.4 Vitotronic 200, type GW1, part no. 7248 084
Specification
11
Construction
The control unit comprises a standard unit, electronic modules and a
programming unit.
Standard unit:
■ ON/OFF switch
■ TEST key
■ Emissions test switch
■ Optolink laptop interface
■ Temperature controller
DIN TR 77708
or
DIN TR 96808
■ High limit safety cut-out
DIN STB 116907
or
DIN STB 98108
■ Operation and fault displays
■ Plug connection chamber
– Connection of external equipment via a system plug
– Connection of three-phase consumers via additional contactors
Programming unit:
■ With digital time switch
■ Backlit display with plain text support
■ Adjustment and display of temperatures and codes
■ Fault message display
■ All adjustments and the most important codes as plain text
■ Rotary selector for the temperature in standard mode
■ Keys:
– Temperature for reduced mode
– Program selection
– Holiday program
– Party and economy mode
– DHW temperature
– Heating curve for boiler water temperature (= system flow temperature)
– Time/Date
Functions
■ Weather-compensated control of the boiler water temperature
(= system flow temperature)
■ Electronic maximum and minimum temperature limit
■ Demand-dependent heating circuit pump and burner stop (not for
burners on boilers with a low-end boiler water temperature limit)
■ Adjustment of a variable heating limit
■ Anti-seizing pump protection
■ Integral diagnostic system
■ Flue gas temperature monitoring with flue gas temperature sensor
■ Maintenance display
■ Adaptive cylinder thermostat with priority control (heating circuit
pump OFF)
■ Auxiliary function for DHW heating (short-term heating to a higher
temperature)
■ Control of a primary store system with mixer assembly (only available
as an alternative to the control of a constant return temperature
raising facility with a regulated three-way valve)
■ Optional connection of external fault messaging
■ With boiler protection function subject to boiler version:
– Therm-Control start-up system
– Shunt pump control
– Control of a constant return temperature raising facility with a
regulated three-way valve (only available as an alternative to the
control of a primary store system with mixer assembly)
The requirements of DIN EN 12831 for heat load calculation are met.
To reduce the heat-up load, the reduced room temperature will be
raised in case of low outside temperatures. The flow temperature will
be raised for a limited time to reduce the heat-up time after a setback
period.
According to the Energy Savings Order [Germany], the temperature in
each room must be individually controlled, e.g. through thermostatic
radiator valves.
Control characteristics
■ P-characteristics with two-point output when using a burner with
multiple stages
Pl characteristics with three-point output when using a modulating
burner, if installed
■ Thermostat for limiting the max. boiler water temperature:
95°C, adjustable to 100°C
■ Adjusting the high limit safety cut-out:
110°C, adjustable to 100°C
■ Heating curve setting range:
– Slope: 0.2 to 3.5
– Level: −13 to 40 K
– Max. limit: 20 to 130°C
– Min. limit: 1 to 127 °C
■ Range of the set DHW temperature:
10 to 60°C; can be changed to 10 to 95°C
Boiler coding card
For matching to the boiler (supplied with the boiler).
Time switch
Digital time switch
■ Day and week program, annual calendar
■ Automatic summer/winter time changeover
■ Automatic function for DHW heating and DHW circulation pump
■ Time, day and standard switching times for central heating, DHW
heating and the DHW circulation pump are factory-set
■ Switching times are individually programmable, i.e. up to four switching
periods per day
Shortest switching interval: 10 minutes
Power backup: 5 years
5822 426 GB
56 VIESMANN OIL/GAS BOILERS

Control units (cont.)
Setting heating programs
The heating system frost protection (see frost protection function)
applies to all heating programs.
You can select the following operating programs with the program
keys:
■ Heating and DHW
■ Only DHW
■ Standby mode
Optional external heating program changeover.
Frost protection
■ The frost protection function is switched on if the temperature drops
approx. +1 °C below the outside temperature, i.e. the heating circuit
pump is switched on and the boiler water is maintained at a lower
temperature (see chapter "Operating conditions with Vitotronic boiler
control units").
■ "Standby mode":
The frost protection function is switched off if the outside temperature
is exceeded by approx.+3 °C, i.e. the heating circuit pump and
burner are switched off.
■ "Heating and DHW"
The frost protection function is switched off if the outside temperature
is exceeded by approx. +3 °C, i.e. the heating circuit pump is
switched off and the low-end boiler water temperature required for
the relevant boiler is maintained as necessary (see chapter "Operating
conditions with Vitotronic boiler control units").
Summer mode
("DHW only")
The burner starts only when the DHW cylinder needs reheating (controlled
by the cylinder thermostat).
The respective low-end boiler water temperature of each boiler is
maintained if necessary.
Adjusting the heating curves (slope and level)
The Vitotronic 200 controls the boiler water temperature (= system flow
temperature), subject to weather conditions.
The flow temperature required to reach a specific room temperature
depends on the heating system and the thermal insulation of the building
to be heated.
Adjusting the heating curve matches the boiler water temperature to
these conditions.
The upper boiler water temperature is limited by the thermostat and
the electronic maximum temperature limiter.
Specification
Rated voltage 230 V~
Rated frequency
50 Hz
Rated current
2 x 6 A
Power consumption
10 W
Protection class
I
IP rating IP 20 D to EN 60529;
ensure through appropriate
design/installation
Function
Type 1B to
EN 60 730-1
Permissible ambient temperature
– during operation 0 to +40 °C
Installation in living
spaces or boiler rooms
(standard ambient conditions)
– during storage and transport -20 to +65 °C
Rated capacity of the relay outputs
sÖ Heating circuit pumps
or
Primary pump, primary store system
Circulation pump
or
Flue gas/water heat exchanger
or
Switching output 4(2) A, 230 V~
sA Circulation pump for cylinder heating
4(2) A, 230 V~
sK DHW circulation pump 4(2) A, 230 V~
sL Shunt pump 4(2) A, 230 V~
gÖ Central fault message 4(2) A, 230 V~
gS Mixer motor constant return temperature
control
or
Motor, 3-way mixing valve, primary
store system 0.2(0.1) A, 230 V~
Total sÖ, sA, sK, sL, gÖ, gS max. 6 A, 230 V~
fA Burner 4(2) A, 230 V~
lÖ Burner, two-stage 1(0.5) A, 230 V~
lÖ Burner, modulating, if installed 0.2(0.1) A, 230 V~
11
Slope
Boiler water or
flow temperature in °C
110
100
90
80
70
60
50
40
30
3,4
3,2
3,0
2,8
2,6
2,4
2,2
2,0
1,8
1,6
1,4
1,2
1,0
0,8
0,6
0,4
0,2
20 15 10 5 0 -5 -10 -15 -20 -25
Outside temperature in °C
-30
5822 426 GB
OIL/GAS BOILERS VIESMANN 57

Control units (cont.)
Delivered condition
■ Programming unit
■ Outside temperature sensor
■ Boiler water temperature sensor
■ Cylinder temperature sensor
■ Bag with technical documentation
Heating system with DHW cylinder
Order separately:
■ Circulation pump with check valve for regulating the cylinder temperature
or
■ Vitotrans 222 primary store system with mixer assembly
Communication
The LON communication module (accessories) is required for communication
with other control units.
11.5 Vitotronic 300, type GW2, part no. 7248 085
Specification
11
Construction
The control unit comprises a standard unit, electronic modules and a
programming unit.
Standard unit:
■ ON/OFF switch
■ TEST key
■ Emissions test switch
■ Optolink laptop interface
■ Temperature controller
DIN TR 77708
or
DIN TR 96808
■ High limit safety cut-out
DIN STB 116907
or
DIN STB 98108
■ Operation and fault displays
■ Plug connection chamber
– Connection of external equipment via a system plug
– Connection of three-phase consumers via additional contactors
Programming unit:
■ With digital time switch
■ Backlit display with plain text support
■ Adjustment and display of temperatures and codes
■ Fault message display
■ All adjustments and the most important codes as plain text
■ Rotary selector for the temperature in standard mode
■ Keys:
– Temperature for reduced mode
– Program selection
– Holiday program
– Party and economy mode
– DHW temperature
– Heating curve for boiler water temperature (= system flow temperature)
and flow temperature
– Heating circuit selection
– Time/Date
Functions
■ Weather-compensated regulation of the boiler water temperature
(= system flow temperature) and/or flow temperature
■ Electronic maximum and minimum temperature limit
■ Demand-dependent heating circuit pump and burner stop (not for
burners on boilers with a low-end boiler water temperature limit)
■ Adjustment of a variable heating limit
■ Anti-seizing pump protection
■ Integral diagnostic system
■ Flue gas temperature monitoring with flue gas temperature sensor
■ Maintenance display
■ Adaptive cylinder thermostat with priority (heating circuit pump OFF,
mixer closed)
■ Auxiliary function for DHW heating (short-term heating to a higher
temperature)
■ Control of a primary store system with mixer assembly (only available
as an alternative to the control of a constant return temperature
raising facility with a regulated three-way valve)
■ Optional connection of external fault messaging
■ With boiler protection function subject to boiler version:
– Therm-Control start-up system
– Shunt pump control
– Control of a constant return temperature raising facility with a
regulated three-way valve (only available as an alternative to the
control of a primary store system with mixer assembly)
The requirements of DIN EN 12831 for heat load calculation are met.
To reduce the heat-up load, the reduced room temperature will be
raised in case of low outside temperatures. The flow temperature will
be raised for a limited time to reduce the heat-up time after a setback
period.
According to the Energy Savings Order [Germany], the temperature in
each room must be individually controlled, e.g. through thermostatic
radiator valves.
Control characteristics
■ Boiler control unit
P-characteristics with two-point output when using a multi-stage
burner, if installed
Pl characteristics with three-point output when using a modulating
burner, if installed
■ Heating circuit control unit
PI characteristics with three-point output
■ Thermostat for limiting the max. boiler water temperature:
95°C, adjustable to 100°C
■ Adjusting the high limit safety cut-out:
110 °C, adjustable to 100°C
■ Heating curve setting range:
– Slope: 0.2 to 3.5
– Level: −13 to 40 K
– Max. limit: 20 to 127°C
– Min. limit: 1 to 127°C
■ Range of the set DHW temperature:
10 to 60°C; can be changed to 10 to 95°C
Boiler coding card
For matching to the boiler (supplied with the boiler).
Time switch
Digital time switch
■ Day and week program, annual calendar
■ Automatic summer/winter time changeover
■ Automatic function for DHW heating and DHW circulation pump
■ Time, day and standard switching times for central heating, DHW
heating and the DHW circulation pump are factory-set
■ Switching times are individually programmable, i.e. up to four switching
periods per day
Shortest switching interval: 10 minutes
Power backup: 5 years
5822 426 GB
58 VIESMANN OIL/GAS BOILERS

Control units (cont.)
5822 426 GB
Setting heating programs
The heating system frost protection (see frost protection function)
applies to all heating programs.
You can select the following operating programs with the program
keys:
■ Heating and DHW
■ Only DHW
■ Standby mode
Optional external changeover of heating program for all heating circuits
together or for selected heating circuits only.
Frost protection
■ The frost protection function is switched on if the temperature drops
approx. +1 °C below the outside temperature, i.e. the heating circuit
pump is switched on and the boiler water is maintained at a lower
temperature (see chapter "Operating conditions with Vitotronic boiler
control units").
■ "Standby mode":
The frost protection function is switched off if the outside temperature
is exceeded by approx.+3 °C, i.e. the heating circuit pump and
burner are switched off.
■ "Heating and DHW"
The frost protection function is switched off if the outside temperature
is exceeded by approx. +3 °C, i.e. the heating circuit pump is
switched off and the low-end boiler water temperature required for
the relevant boiler is maintained as necessary (see chapter "Operating
conditions with Vitotronic boiler control units").
Summer mode
("DHW only")
The burner starts only when the DHW cylinder needs reheating (controlled
by the cylinder thermostat).
The respective low-end boiler water temperature of each boiler is
maintained if necessary.
Adjusting the heating curves (slope and level)
The Vitotronic 300 controls the boiler water temperature (=system flow
temperature) and the flow temperature of the heating circuits with
mixer in weather-compensated mode. The boiler water temperature is
automatically boosted by between 0 and 40 K above the currently
required set flow temperature (delivered condition 8 K).
The flow temperature required to reach a specific room temperature
depends on the heating system and the thermal insulation of the building
to be heated.
Adjusting both heating curves matches the boiler water temperature
(= system flow temperature) and the flow temperature to these operating
conditions.
The upper boiler water temperature is limited by the thermostat and
the electronic maximum temperature limiter.
Boiler water or
flow temperature in °C
110
100
90
80
70
60
50
40
30
Specification
Slope
3,4
3,2
3,0
2,8
2,6
2,4
2,2
2,0
20 15 10 5 0 -5 -10 -15 -20 -25 -30
Outside temperature in °C
1,8
1,6
1,4
1,2
1,0
0,8
0,6
0,4
0,2
Rated voltage 230 V~
Rated frequency
50 Hz
Rated current
2 x 6 A
Power consumption
10 W
Protection class
I
IP rating IP 20 D to EN 60529;
ensure through appropriate
design/installation
Function
Type 1B to
EN 60 730-1
Permissible ambient temperature
– during operation 0 to +40 °C
Installation in living
spaces or boiler rooms
(standard ambient conditions)
– during storage and transport -20 to +65 °C
Rated capacity of the relay outputs
sÖ Heating circuit pumps
or
Primary pump, primary store system
or
Circulation pump - flue gas/water
heat exchanger, if installed
or
Switching output 4(2) A, 230 V~
sA Circulation pump for cylinder heating
4(2) A, 230 V~
sK DHW circulation pump 4(2) A, 230 V~
sL Shunt pump 4(2) A, 230 V~
gÖ Central fault message 4(2) A, 230 V~
gS Mixer motor
or
Mixer motor constant return temperature
control
or
Motor, 3-way mixing valve, primary
store system 0.2(0.1) A, 230 V~
Total sÖ, sA, sK, sL, gÖ, gS max. 6 A, 230 V~
fA Burner 4(2) A, 230 V~
lÖ Burner, two-stage, if installed 1(0.5) A, 230 V~
lÖ Burner, modulating, if installed 0.2(0.1) A, 230 V~
11
OIL/GAS BOILERS VIESMANN 59

Control units (cont.)
Delivered condition
■ Programming unit
■ Outside temperature sensor
■ Boiler water temperature sensor
■ Cylinder temperature sensor
■ Bag with technical documentation
Communication
The LON communication module (accessories) is required for communication
with other control units.
Heating system with DHW cylinder
Order separately:
■ Circulation pump with check valve for regulating the cylinder temperature
or
■ Vitotrans 222 primary store system with mixer assembly
11.6 Vitotronic 300-K, type MW1, part no. 7248 233
Specification
11
Construction
The control unit comprises a standard unit, electronic modules and a
programming unit.
Standard unit:
■ ON/OFF switch
■ Emissions test switch
■ Optolink laptop interface
■ Operation and fault displays
■ Plug connection chamber
– Connection of external equipment via a system plug
– Plug the connectors directly into the front of the open control unit
– Connection of three-phase consumers via additional contactors
Programming unit:
■ With digital time switch
■ Backlit display with plain text support
■ Adjustment and display of temperatures and codes
■ Fault message display
■ Rotary selector for the temperature in standard mode
■ Keys:
– Temperature for reduced mode
– Program selection
– Holiday program
– Party and economy mode
– DHW temperature
– Heating curves for the system flow temperature and the flow temperature
of the heating circuits with mixer
– Heating circuit selection
– Time/Date
Functions
■ Weather-compensated control of the system flow temperature of a
multi-boiler system with up to four boilers with the Vitotronic 100,
type GC1, (modulating) and the flow temperature of the heating circuits
with mixer
■ Control of the Vitotronic 100, type GC1, to effect the control of the
boiler in accordance with a boiler sequence strategy (freely selected)
■ Electronic maximum and minimum temperature limit
■ Demand-dependent heating circuit pump shutdown
■ Adjustment of a variable heating limit
■ Anti-seizing pump protection
■ Central fault message
■ Integral diagnostic system
■ Adaptive cylinder thermostat with priority (heating circuit pump OFF,
mixer closed)
■ Auxiliary function for DHW heating (short-term heating to a higher
temperature)
■ Control of a primary store system with mixer assembly (only available
as an alternative to the control of a constant return temperature
raising facility with a regulated three-way valve)
■ Screed drying, for underfloor heating systems
■ With boiler protection functions subject to system version:
– Distribution pump control
or
– Shunt pump control
or
– Control of a constant return temperature raising facility with a
regulated three-way valve (only available as an alternative to the
control of a primary store system with mixer assembly)
The requirements of DIN EN 12831 for heat load calculation are met.
To reduce the heat-up load, the reduced room temperature will be
raised in case of low outside temperatures. The flow temperature will
be raised for a limited time to reduce the heat-up time after a setback
period.
According to the Energy Savings Order [Germany], the temperature in
each room must be individually controlled, e.g. through thermostatic
radiator valves.
Control characteristics
■ PI characteristics with three-point output
■ Setting range for heating curves:
– Slope: 0.2 to 3.5
– Level: -13 to 40 K
– Max. limit: 20 to 130 °C
– Min. limit: 1 to 127 °C
– Differential temperature for a heating circuit with mixer: 0 to 40 K
■ Set DHW temperature range:
10 to 60 °C; can be changed to 10 to 95 °C
Time switch
Digital time switch
■ Day and week program, annual calendar
■ Automatic summer/winter time changeover
■ Automatic function for DHW heating and DHW circulation pump
■ Time, day and standard switching times for central heating, DHW
heating and the DHW circulation pump are factory-set
■ Switching times are individually programmable, i.e. up to four switching
periods per day
Shortest switching interval: 10 minutes
Power backup: 5 years
Setting heating programs
The heating system frost protection (see frost protection function)
applies to all heating programs.
You can select the following operating programs with the program
keys:
5822 426 GB
60 VIESMANN OIL/GAS BOILERS

Control units (cont.)
■ Heating and DHW
■ Only DHW
■ Standby mode
Optional external changeover of heating program for all heating circuits
together or for selected heating circuits only.
Frost protection
■ The frost protection function will be switched on if the outside temperature
drops below approx. +1 °C, i.e. the heating circuit pumps
will be started and the flow temperature will be maintained at a minimum
of 10 °C.
■ The frost protection function will be switched off if the outside temperature
exceeds approx. +3 °C, i.e. the heating circuit pumps will
be stopped.
Summer mode
("DHW only")
The burners start only when the DHW cylinder needs reheating (controlled
by the cylinder thermostat).
The respective low-end boiler water temperature of each boiler is
maintained if necessary.
Adjusting the heating curves (slope and level)
The Vitotronic regulates the system flow temperature and the flow
temperature of the heating circuits with mixer in weather-compensated
mode. For this, the system flow temperature is automatically boosted
by between 0 and 40 K (delivered condition 8 K) above the currently
required set flow temperature of the heating circuits with mixer.
The flow temperature required to reach a specific room temperature
depends on the heating system and the thermal insulation of the building
to be heated.
Adjusting the heating curves matches the system flow temperature
and the flow temperature of the heating circuits with mixer to these
operating conditions.
The upper flow temperature of the heating circuits with mixer is limited
by the thermostat and the electronic maximum temperature limiter of
the Vitotronic 100, type GC1.
Boiler water or
flow temperature in °C
110
100
90
80
70
60
50
40
30
Slope
3,4
3,2
3,0
2,8
2,6
2,4
2,2
2,0
20 15 10 5 0 -5 -10 -15 -20 -25 -30
Outside temperature in °C
1,8
1,6
1,4
1,2
1,0
0,8
0,6
0,4
0,2
Specification
Rated voltage 230 V~
Rated frequency
50 Hz
Rated current
6 A
Power consumption
10 W
Protection class
I
IP rating IP 20 D to EN 60529;
ensure through appropriate
design/installation
Function
Type 1B to
EN 60 730-1
Permissible ambient temperature
– during operation 0 to +40 °C
Installation in living
spaces or boiler rooms
(standard ambient conditions)
– during storage and transport -20 to +65 °C
Rated capacity of the relay outputs
sÖ Heating circuit pumps
or
Heat exchanger set
or
Switching output 4(2) A 230 V~
sA Circulation pump for cylinder heating
4(2) A 230 V~
sK DHW circulation pump 4(2) A 230 V~
sL Shunt pump 4(2) A 230 V~
gÖ Central fault message 4(2) A 230 V~
gS Mixer motor
or
Mixer motor constant return temperature
control
or
Motor, 3-way mixing valve, primary
store system 0.2(0.1) A 230 V~
Total 6 A 230 V~
Dimensions
584
A Vitotronic 300-K
B Mounting panel
A
B
297
108
172
A
B
11
5822 426 GB
Delivered condition
■ Programming unit
■ LON communication module with two terminators
■ Outside temperature sensor
■ Flow temperature sensor
■ Cylinder temperature sensor
■ Mounting panel
■ Bag with technical documentation
The control unit is delivered with one of the boilers of the multi-boiler
system (see pricelist) and is mounted with a mounting bracket either
on the wall or on the side of the boiler.
OIL/GAS BOILERS VIESMANN 61

Control units (cont.)
Heating system with DHW cylinder
Order separately:
■ Circulation pump with check valve for regulating the cylinder temperature
or
■ Vitotrans 222 primary store system with mixer assembly
Heating system with heating circuit with mixer
An extension kit (accessories) is required for each heating circuit with
mixer.
11.7 Control unit accessories
Allocation of accessories according to control unit type
11
Single boiler system
Multi-boiler system
Vitotronic 100 200 300 300-K 100
Type GC1 GW1 GW2 MW1 GC1
Accessories
Extension kit for one heating circuit with mixer X X
Mixer motor X X
Plug sÖ X X X X X
Plug gS X X X X X
Plugs for sensors X X X X X
Contact temperature sensor X X X X X
Immersion temperature sensor X X X X X
Immersion thermostat X X
Contact thermostat X X
Vitotrol 200 X X X
Vitotrol 300 X X X
Room temperature sensor X X
Flue gas temperature sensor X X X X
Cylinder temperature sensor X
Sensor well X X X
Radio clock receiver X X X
Plug-in adaptor for external safety equipment X X X X
Function extension 0–10 V X X X X
Contactor relay X X X X X
Mating plugs fA and lÖ X X X X
LON communication module X X X
LON cable X X X X
LON coupling X X X X X
LON plug-in connector X X X X X
LON socket X X X X X
Terminator X X X
Extension kit for one heating circuit with mixer
Part no. 7450 650
Components:
■ Mixer motor with connecting cable
■ Plug for the heating circuit pump and flow temperature sensor (contact
temperature sensor)
The mixer motor is mounted directly onto the Viessmann mixer DN 20
to 50 and R ½ to 1¼.
Mixer motor
180
90
130
Specification
Cable length
4.2 m, fully wired
Rated voltage 230 V~
Rated frequency
50 Hz
5822 426 GB
62 VIESMANN OIL/GAS BOILERS

Control units (cont.)
Power consumption
Protection class
IP rating
4 W
II
IP 42 to EN 60529; ensure
through appropriate design
and installation
Permissible ambient temperature
– during operation 0 to +40 °C
– during storage and transport -20 to +65 °C
Torque
3 Nm
Runtime for 90 ° ∢
120 s
Specification
Lead length
IP rating
5.8 m, fully wired
IP 32 to EN 60529; ensure
through appropriate design
and installation
Viessmann Ni500
Sensor type
Permissible ambient temperature
– during operation 0 to +120 °C
– during storage and transport -20 to +70 °C
Flow temperature sensor (contact temperature sensor)
42
40
76
Mixer motor for flanged mixers
■ Part no. 9522 487
DN 40 and 50, without system plug and connecting cable
■ Part no. Z004344
DN 65 to 100, without system plug and connecting cable
For specification, see the "Mixer and mixer motors" datasheet.
11
Plug sÖ
Part no. 7415 056
for heating circuit pump
Plug gS
Part no. 7415 057
for mixer motors
Plugs for sensors
Part no. 7415 058
Contact temperature sensor
Part no. 7183 288
For capturing the flow and return temperature.
76
42
40
Specification
Lead length
IP rating
5.8 m, fully wired
IP 32 to EN 60529; ensure
through appropriate design
and installation
Viessmann Ni500
Sensor type
Permissible ambient temperature
– during operation 0 to +120 °C
– during storage and transport -20 to +70 °C
5822 426 GB
OIL/GAS BOILERS VIESMANN 63

Control units (cont.)
Immersion temperature sensor
Part no. 7450 641
For capturing the flow and return temperature.
Specification
Lead length
3.8 m, fully wired
IP rating IP 32 acc. to EN 60529
ensure through appropriate
design/installation
Sensor type
Viessmann Ni500
Permissible ambient temperature
– during operation 0 to +90 °C
– during storage and transport −20 to +70 °C
11
Immersion thermostat
Part no. 7151 728
May be used as a maximum temperature limiter for underfloor heating
systems.
The temperature limiter is installed into the heating flow and switches
the heating circuit pump OFF if the flow temperature is too high.
72
130
95
200
Specification
Lead length
4.2 m, fully wired
Setting range 30 to 80 °C
Switching differential
max. 11 K
Breaking capacity 6(1.5) A 250 V~
Setting scale
inside the casing
Stainless steel sensor well
R ½" x 200 mm
DIN reg. no. DIN TR 116807
or
DIN TR 96808
Contact thermostat
Part no. 7151 729
May be used as a maximum temperature limiter for underfloor heating
systems (only in conjunction with metallic pipes).
The temperature limiter is installed into the heating flow and switches
the heating circuit pump OFF if the flow temperature is too high.
72
130
Specification
Lead length
4.2 m, fully wired
Setting range 30 to 80 °C
Switching differential
max. 14 K
Breaking capacity 6(1.5) A 250V~
Setting scale
inside the casing
DIN reg. no. DIN TR 116807
or
DIN TR 96808
95
Information regarding the Vitotrol 200 and 300
For every heating circuit in a heating system, one Vitotrol 200 or one
Vitotrol 300 can be deployed.
5822 426 GB
64 VIESMANN OIL/GAS BOILERS

75
Control units (cont.)
Vitotrol 200
Part no. 7450 017
KM BUS subscriber
The Vitotrol 200 remote control regulates the heating program for one
heating circuit and the required set room temperature in standard
mode, from any room in the house.
The Vitotrol 200 is equipped with backlit heating program selection
keys as well as a party and economy key.
The fault display shows faults on the control unit.
WS function:
Installation anywhere in the building.
RS function:
Installation in the main living room on an internal wall opposite radiators.
Never install inside shelf units, recesses, immediately by a door
or heat source (e.g. direct sunlight, fireplace, TV set, etc.).
The integral room temperature sensor captures the actual room temperature
and effects any necessary correction of the flow temperature
as well as a rapid heat-up at the start of the heating operation (if
appropriately programmed).
Connection:
■ 2-core lead, length max. 50 m (even if connecting several remote
control units)
■ Never route this lead immediately next to 230/400 V cables
■ LV plug part of the standard delivery
Specification
Power supply via KM BUS
Power consumption
0.2 W
Protection class
III
Protection level IP 30 to EN 60529;
safeguard through appropriate
design and installation
Permissible ambient temperature
– during operation 0 to +40 °C
– during storage and transport −20 to +65 °C
Set room temperature range 10 to 30 °C
adjustable from
3 to 23 °C or
17 to 37 °C
The set room temperature for reduced mode is adjusted at the control
unit.
30
11
115
Vitotrol 300
5822 426 GB
Part no. 7248 907
KM BUS subscriber
The Vitotrol 300 remote control regulates the required set room temperature
for one heating circuit in standard and reduced mode, the
heating program and the switching times for central heating, DHW
heating and the DHW circulation pump.
The Vitotrol 300 provides a backlit display as well as backlit heating
program keys, a party and economy key, automatic summer/winter
time changeover, keys for holiday program, day and time.
WS function:
Installation at any point in the building.
RS function:
Installation in the main living room on an internal wall opposite radiators.
Never install inside shelf units, niches, immediately by a door or
heat source (e.g. direct sunlight, fireplace, TV set, etc.).
The integral room temperature sensor captures the actual room temperature
and effects any necessary correction of the flow temperature
as well as a rapid heat-up at the start of the heating operation (if suitably
encoded).
Connection:
■ 2-core lead, length max. 50 m (even if connecting several remote
control units)
■ Never route this lead immediately next to 230/400 V cables
■ LV plug as standard delivery
115
194
30
Specification
Power supply via KM BUS
Power consumption
0.5 W
Protection class
III
Protection IP 30 to EN 60529;
safeguard through appropriate
design and installation
Permissible ambient temperature
– during operation 0 to +40 °C
– during storage and transport -20 to +65 °C
Set room temperature range
– for standard mode 10 to 30 °C
adjustable to
3 to 23 °C or
17 to 37 °C
– for reduced mode 3 to 37 °C
OIL/GAS BOILERS VIESMANN 65

Control units (cont.)
Room temperature sensor
Part no. 7408 012
Separate room temperature sensor as supplement to the Vitotrol 200
and 300; to be used if the Vitotrol 200 or 300 cannot be installed inside
the main living room or in a suitable position where the unit can capture
and adjust the temperature.
Installation in the main living room on an internal wall opposite radiators.
Never install inside shelving units, in recesses, or immediately by
a door or heat source (e.g. direct sunlight, fireplace, TV set, etc.).
Connect the room temperature sensor to the Vitotrol 200 or 300.
Connection:
■ 2-core lead with a cross-section of 1.5 mm 2 (copper)
■ Lead length from the remote control up to 30 m
■ Never route this lead immediately next to 230/400 V cables
Specification
Protection class
III
IP rating IP 30 to EN 60529;
ensure through appropriate
design/installation
Sensor type
Viessmann Ni500
Permissible ambient temperature
– during operation 0 to +40 °C
– during storage and transport −20 to +65 °C
□80
20
11
Flue gas temperature sensor
Part no. 7450 630
For scanning the flue gas temperature, flue gas temperature monitoring
and maintenance indication, if the set temperature has been exceeded.
With threaded cone.
Installation on the flue pipe. The distance from the boiler must be
approx. 1.5 times the flue pipe diameter, measured from the boiler
edge (back) to the chimney stack.
■ Condensing boilers with Viessmann balanced flue system:
Order the balanced flue pipe with connector for the flue gas temperature
sensor separately.
■ For condensing boilers with on-site flue pipe:
The aperture required for the flue pipe installation must be designed
and approved by the supplier. Install the flue gas temperature sensor
into a stainless steel sensor well (on-site provision).
Specification
Lead length
IP rating
3.8 m, fully wired
IP 60 to EN 60529; ensure
through appropriate design
and installation
Viessmann Pt500
Sensor type
Permissible ambient temperature
– during operation 0 to +600 °C
– during storage and transport -20 to +70 °C
Radio clock receiver
Part no. 7450 563
For receiving the DCF 77 time signal (location: Mainflingen near Frankfurt/Main).
Radio controlled setting of time and date.
Install on an outside wall, facing the transmitter. The reception may be
reduced by metallic elements in the building structure, e.g. steel reinforced
concrete, neighbouring buildings and sources of electro-magnetic
interference, e.g. HV and public transport lines.
Connection:
■ 2-core lead, length up to 35 m with a cross-section of 1.5 mm 2 (copper)
■ Never route this lead immediately next to 230/400 V cables.
5822 426 GB
66 VIESMANN OIL/GAS BOILERS

Control units (cont.)
80
41
66
Plug-in adaptor for external safety equipment
Part no. 7143 526
With cables (3.0 m long), plug aVG and aBÖ.
Up to 4 additional pieces of safety equipment may be connected, for
example:
■ Low water indicator
■ Minimum pressure limiter
■ Maximum pressure limiter
■ Additional high limit safety cut-out
Specification
Protection
IP 20D to EN 60529; safeguard
through appropriate
design and installation
Permissible ambient temperature
– during operation 0 to +40 °C
– during storage and transport −20 to +65 °C
The plug-in adaptor enables the fault (plain text) to be displayed in the
relevant control unit.
Further hook-ups:
■ Controlled external burner shutdown
■ External burner demand (stage 1)
■ Three external fault messages (e.g. pump, zero volt contacts)
11
260
217
84
Function extension 0–10 V
5822 426 GB
Part no. 7174 718
KM BUS subscriber
Including cables equipped with plug fÖ and aVG.
84
130
217
Specification
Rated voltage 230 V ~
Rated frequency
50 Hz
Power consumption
1 W
Rated breaking capacity of the relay output
4(2) A 230 V~
Protection IP 30 to EN 60529
safeguard through appropriate
design and installation
Permissible ambient temperature
– during operation 0 to +40 °C
– during storage and transport -20 to +65 °C
OIL/GAS BOILERS VIESMANN 67

Control units (cont.)
Functions in connection with the function extension 0 – 10 V (accessory)
Functions
Vitotronic
100 200 300 300-K 200-H
0 – 10 V input aVF
Defaulting an additional set boiler water temperature
x x x x –
and
Boiler enable in multi-boiler systems x – – – –
Switching output aBJ (zero volt contact)
Night contact (to signal reduced mode and to switch the heating circuit – x x x x
pump to a lower speed)
or
Switching a feed pump – – – – x
Function extension in single boiler systems
Defaulting an additional set value (0 - 10 V input aVF)
Boiler control unit
Vitotronic 200
or
Vitotronic 300
or
Vitotronic 100 (code "01:1")
Function
Requirements arising from the controlled operation of the Vitotronic
0 – 10 V hook-up provides an additional set value
11
Function extension in multi-boiler systems
Defaulting an additional set value (0 - 10 V input aVF)
Boiler control unit
Vitotronic 100
and
Vitotronic 300-K
Connect the function extension to the Vitotronic 300-K
Multi-boiler system with third party cascade
Vitotronic 100 (code "01:3")
with enable via a 0 - 10 V signal
Connect the function extension to the Vitotronic 100
Vitotronic 100
with 0 – 10 V signal and enable via a switching output aVH
Connect the function extension to the Vitotronic 100
Function
Requirements arising from the controlled operation of the Vitotronic
0 – 10 V hook-up provides an additional set value
Boiler circuit control via 0 – 10 V hook-up
0 to 1 V
– Boiler blocked
– Close butterfly valve
– Boiler circuit or shunt pump OFF
1 to 10 V
– Boiler water temperature default
– Boiler enabled; held at minimum temperature
– Butterfly valve open
– Boiler circuit or shunt pump enabled
Note
On the lead boiler, the voltage must be higher than 1 V.
The boiler is enabled; the boiler is held at its minimum temperature
1 – 10 V additional temperature default
Note
This contact must always be closed on the lead boiler.
Cylinder temperature sensor
Part no. 7450 633
5822 426 GB
68 VIESMANN OIL/GAS BOILERS

Control units (cont.)
Specification
Lead length
IP rating
5.8 m, fully wired
IP 32 to EN 60529; ensure
through design/installation
Sensor type
Permissible ambient temperature Viessmann Pt500
– during operation 0 to +90 °C
– during storage and transport −20 to +70 °C
Sensor well
Part no. 7819 693
R ½" x 200 mm
For the cylinder temperature sensor, part of the standard delivery of
Viessmann DHW cylinders.
Contactor relay
Part no. 7814 681
Contactor in small casing.
With 4 N/C and 4 N/O contacts.
With terminal strip for earth conductors.
Specification
Coil voltage
Rated current (I th )
230 V~/50 Hz
AC1 16 A
AC3 9 A
180
145
95
11
Mating plugs fA and lÖ
Part no. 7408 790
Required for an on-site burner without mating plug.
LON communication module
Part no. 7172 173
(Only for single boiler systems)
Electronics PCB for data exchanger with the heating circuit control unit
Vitotronic 200-H, Vitocom 300 and for connection to a higher level
building management system.
For the connecting cables, see section "Vitocom".
LON connecting cable for data exchange between control units
Part no. 7143 495 Cable length 7 m, fully wired (RJ 45).
5822 426 GB
OIL/GAS BOILERS VIESMANN 69

Control units (cont.)
Extension of the connecting cable
■ Installation spacing 7 to 14 m:
– 2 connecting cables (7.0 m long)
Part no. 7143 495
– 1 LON coupling RJ45
Part no. 7143 496
■ Installation distance 14 to 900 m with plug-in connectors:
– 2 LON plug-in connectors
Part no. 7199 251
– 2-core cable:
CAT5, screened
or
Solid conductor AWG 26-22 / 0.13 mm 2 - 0.32 mm 2 ,
Conductor AWG 26-22 / 0.14 mm 2 - 0.36 mm 2
7 4.5 mm - 8 mm
on-site
■ Installation distance 14 to 900 m with junction boxes:
– 2 connecting cables (7.0 m long)
Part no. 7143 495
– 2-core cable:
CAT5, screened
or
Solid conductor AWG 26-22 / 0.13 mm 2 - 0.32 mm 2 ,
Conductor AWG 26-22 / 0.14 mm 2 - 0.36 mm 2
7 4.5 mm - 8 mm
on-site
– 2 LON sockets RJ45, CAT6
Part no. 7171 784
Terminator (2 pce.)
Part no. 7143 497
To terminate the LON BUS at the first and last control unit.
11.8 On site connections
Auxiliary functions for single boiler systems with the Vitotronic 200, type GW1 or Vitotronic 300, type GW2
11
Plug aVD
A
External blocking/mixer Close
Closing contact B causes the burner to shut down or the mixer to be
closed.
In coding address "99" you select which heating circuits are affected
by the function external blocking or mixer "Close".
B
Note
The frost protection of the relevant boiler or heating circuit is no longer
effective during the controlled shutdown or with mixer "Close", i.e. the
lower boiler water temperature or flow temperature are no longer
maintained.
1 2 3
Plug aVH
143
A External heating program changeover/mixer "open"
B External blocking/mixer "close"
A and B are zero volt contacts.
External heating program changeover/mixer open
Closing contact A can change the manually selected heating program
or open the connected mixers.
In coding address "9A", the external function mixer "open" can be allocated
to the individual heating circuits.
In coding address "91", the external heating program changeover can
be allocated to the heating circuits.
Operating programs
Symbol Description
9 Central heating OFF and DHW OFF
w
Central heating OFF and DHW ON
rw
Central heating ON and DHW ON
Subject to the setting of coding address "d5", the system can be
changed from three manually selectable heating programs 9, w,
rw (contact open) either to 9 or rw (contact closed).
1 2 3
146
A External changeover of stepped/modulating burners
B External demand
A and B are zero volt contacts.
External demand
Closing contact B starts the burner of the boiler subject to load.
The boiler water temperature is limited via the maximum set boiler
water temperature or via the mechanical control thermostat.
The set value is selected in coding address "9b".
5822 426 GB
70 VIESMANN OIL/GAS BOILERS

Control units (cont.)
External changeover of multi-stage/modulating burners
■ Contact A open:
Modulating operation
■ Contact A closed:
Two-stage operation
Set coding address "02" accordingly.
Auxiliary functions for multi-boiler systems with the Vitotronic 300-K and Vitotronic 100, type GC1 via LON
Plugs aVD and aVH at the Vitotronic 300-K
A
B
External demand
Closing contact C starts the burner or boiler subject to load.
The boiler water temperature is limited via the maximum set boiler
water temperature or via the mechanical control thermostat.
The set value is selected in coding address "9b".
Plug aVD at the Vitotronic 100, type GC1
C
A
1 2 3
143
1 2 3
146
B
A Change of external heating program/mixer "open"
B External blocking/mixer "close"
C External demand
A, B and C are zero volt contacts.
External heating program changeover/mixer open
Closing contact A can change the manually selected heating program
or open the connected mixers.
In coding address "9A", the external function mixer "open" can be allocated
to the individual heating circuits.
In coding address "91", the external heating program changeover can
be allocated to the heating circuits.
Operating programs
Symbol Description
9 Central heating OFF and DHW OFF
w
Central heating OFF and DHW ON
rw
Central heating ON and DHW ON
Subject to the setting of coding address "d5", the system can be
changed from three manually selectable heating programs 9, w,
rw (contact open) either to 9 or rw (contact closed).
External blocking/mixer Close
Closing contact B causes the burner to shut down or the mixer to be
closed.
In coding address "99" you select which heating circuits are affected
by the function external blocking or mixer "Close".
Note
The frost protection of the relevant boiler or heating circuit is no longer
effective during the controlled shutdown or when the mixer "Close",
i.e. the lower boiler water temperature or flow temperature are no longer
maintained.
1 2 3
143
A Boiler blocking
B Start boiler as the last one in the boiler sequence
A and B are zero volt contacts.
Boiler blocking
■ Contact A closed:
The boiler is blocked and removed from the boiler sequence, i.e. the
butterfly valve or the three-way mixing valve for constant return temperature
control is closed; shunt or boiler circuit pumps are switched
OFF. The other boilers must provide the required heating.
Note
The heating system is no longer protected against frost if all boilers
are blocked or when there are no other available boilers.
■ Contact A open:
The boiler is reinstated into the current boiler sequence.
Start boiler as the last one in the boiler sequence
■ Contact B closed:
The boiler is started as the last one in the boiler sequence.
The heat demand of the heating system is being met by the other
boilers.
This boiler is started if the output of the other boilers is inadequate.
■ Contact B open:
The boiler is returned into the current boiler sequence.
11
5822 426 GB
OIL/GAS BOILERS VIESMANN 71

Control units (cont.)
Connection to on-site control units to the Vitotronic 100, type GC1 in single boiler systems
Operation with a two-stage burner
A
B
C
■ The cylinder thermostat is activated when the cylinder temperature
sensor is connected.
■ The high limit safety cut-out settings and other settings depend on
the system equipment level and the safety equipment to EN 12828
or EN 12953.
High limit safety cut-out 110 °C 100 °C
Temperature controller 100 °C 87 °C
Coding address "06" for electronic maximum
95 °C 85 °C
temperature limit (Vitotronic 100)
Maximum temperature of the on-site
control unit
90 °C 80 °C
1 2 3
143
1 2 3
146
Note
A safety temperature of 120 °C (EN12953) is only permissible with
an additional, self-monitoring high limit safety cut-out. For an accessory
pack for safety temperature 120 ºC, see Viessmann pricelist.
A Burner stage 1 "ON"
B Burner stage 2 "ON"
C External load-dependent starting
Operation with a modulating burner
A
A, B and C are zero volt contacts of the higher control unit.
11
External burner start – burner stage 1
Contact at terminals 1 and 2 of plug aVD
■ Contact closed:
Burner stage 1 is switched ON.
Burner stage 2 is switched ON only for maintaining the minimum
temperature.
The boiler water temperature is limited by the electronic maximum
temperature limiter (see the Vitotronic 100 service instructions), if it
is set below that of mechanical thermostat "R".
■ Contact open:
Burner stage 1 is switched OFF.
143
1 2 3
B
41
90
BU
BK
BN
C
D
External burner start – burner stage 1 and 2
Contact at terminals 2 and 3 of plug aVD
■ Contact closed:
Both burner stages are switched ON.
The boiler water temperature is limited by the electronic maximum
temperature limiter, if it is set below that of mechanical control thermostat
"R".
Burner stage 2 is switched OFF 2 K sooner.
■ Contact open:
Burner stages 1 and 2 are switched OFF.
External starting subject to load
The burner is started, subject to load, when the zero volt contact across
terminals "2" and "3" at plug-in connector aVH closes.
The boiler will be constantly operated at the set temperature.
The boiler water temperature is limited via the maximum set boiler
water temperature or via the mechanical control thermostat.
The set value is adjusted via code "9b".
41
E
A Plug to the control unit
B Burner stage 1 (base load) "ON"
C Reduce burner output (modulation controller)
D Raise burner output (modulation controller)
E Plug to the burner
90
BN
BK
BU
Adjustments at the Vitotronic 100
■ Code "01:1" (delivered condition)
■ The boiler water temperature must be set to the lower value (see
operating conditions, pages 5 to 11).
The minimum boiler temperature is maintained (see operating conditions,
pages 5 to 11).
Colour coding to DIN IEC 60757
BK black
BN brown
BU blue
5822 426 GB
72 VIESMANN OIL/GAS BOILERS

Control units (cont.)
External burner start – burner stage 1
Contact at terminals 1 and 2 of plug aVD
■ Contact closed:
Burner stage 1 is switched on.
The modulation (full load) is switched on only for maintaining the
minimum temperature.
The boiler water temperature is limited by the electronic maximum
temperature limiter (see the Vitotronic 100 service instructions), if it
is set below that of the mechanical thermostat "R".
■ Contact open:
Burner stage 1 is switched off.
Modulating burner connection:
■ Burner stage 1 fA of the Vitotronic 100
■ Plug lÖ from the Vitotronic 100 via modulation controller (on-site) to
plug lÖ on the burner.
■ Set the minimum temperature at the higher control unit with the
modulation controller 5 K higher than the lower boiler water temperature;
see operating conditions.
■ The cylinder thermostat is activated when the cylinder temperature
sensor is connected.
■ The high limit safety cut-out settings and other settings depend on
the system equipment level and the safety equipment to EN 12828
or EN 12953.
High limit safety cut-out 110 °C 100 °C
Temperature controller 100 °C 87 °C
Coding address "06" for electronic maximum
95 °C 85 °C
temperature limit (Vitotronic 100)
Maximum temperature of the on-site
control unit
90 °C 80 °C
Note
A safety temperature of 120 °C (EN12953) is only permissible with
an additional, self-monitoring high limit safety cut-out. For an accessory
pack for safety temperature 120 ºC, see Viessmann pricelist.
Adjustments at the Vitotronic 100
■ Code "01:1" (delivered condition)
■ The boiler water temperature must be set to the lower value (see
operating conditions, pages 5 to 11).
The minimum boiler temperature is maintained (see operating conditions,
pages 5 to 11).
Boiler sequence control with on-site cascade controller — Connections to the Vitotronic 100, type GC1
Operation with a two-stage burner
External burner start – burner stage 1
11
5822 426 GB
1 2 3
143
1 2 3
146
A Burner stage 1 "ON"
B Burner stage 2 "ON"
C Enable boiler
Butterfly valve "open" or "closed"
A
B
C
A, B and C are zero volt contacts of the higher control unit.
The connections on plugs aVD and aVH are required when connecting
an external control unit. The cylinder temperature and the loaddependent
cascade control must be controlled by an external control
unit.
Note
An "enable boiler" contact is essential for multi-boiler systems.
This contact must always be closed on the lead boiler.
Contact at terminals 1 and 2 of plug aVD
■ Contact closed:
Burner stage 1 is switched ON.
Burner stage 2 is switched ON only for maintaining the minimum
temperature.
The boiler water temperature is limited by the electronic maximum
temperature limiter (see the Vitotronic 100 service instructions), if it
is set below that of mechanical thermostat "R".
■ Contact open:
Burner stage 1 is switched OFF.
External burner start – burner stage 1 and 2
Contact at terminals 2 and 3 of plug aVD
■ Contact closed:
Both burner stages are switched ON.
The boiler water temperature is limited by the electronic maximum
temperature limiter, if it is set below that of mechanical control thermostat
"R".
Burner stage 2 is switched OFF 2 K sooner.
■ Contact open:
Burner stages 1 and 2 are switched OFF.
Enable boiler, butterfly valve
Contact at terminals 2 and 3 of plug aVH
■ Contact closed:
Initially, the preheat function for lag boilers is activated.
After the preheat function has expired, the minimum boiler water
temperature will be maintained and the burner stages can be controlled
externally.
■ Contact open:
The butterfly valve is closed after approx. 5 min.
Burner stages cannot be switched ON externally; a minimum temperature
will not be maintained.
Adjustments at the Vitotronic 100
Code "01:3".
OIL/GAS BOILERS VIESMANN 73

Control units (cont.)
The high limit safety cut-out settings and other settings depend on the
system equipment level and the safety equipment to EN 12828 or
EN 12953.
High limit safety cut-out 110 °C 100 °C
Temperature controller 100 °C 87 °C
Coding address "06" for electronic maximum
95 °C 85 °C
temperature limit (Vitotronic 100)
Maximum temperature of the on-site control
unit
90 °C 80 °C
Note
A safety temperature of 120 °C (EN12953) is only permissible with an
additional, self-monitoring high limit safety cut-out. For an accessory
pack for safety temperature 120 ºC, see Viessmann pricelist.
Operation with a modulating burner
A
The connections on plugs aVD and aVH are required when connecting
an external control unit. The cylinder temperature and the loaddependent
cascade control must be controlled by an external control
unit.
Note
An "enable boiler" contact is essential for multi-boiler systems.
This contact must always be closed on the lead boiler.
External burner start – burner stage 1
Contact at terminals 1 and 2 of plug aVD
■ Contact closed:
Burner stage 1 is switched on.
The modulation (full load) is switched on only for maintaining the
minimum temperature.
The boiler water temperature is limited by the electronic maximum
temperature limiter (see the Vitotronic 100 service instructions), if it
is set below that of the mechanical thermostat "R".
■ Contact open:
Burner stage 1 is switched off.
11
146 143
1 2 3
1 2 3
B
C
41
41
90
BU
BK
BN
90
D
E
BN
BK
BU
Modulating burner connection:
■ Burner stage 1 fA of the Vitotronic 100
■ Plug lÖ from the Vitotronic 100 via modulation controller (on-site) to
plug lÖ on the burner.
■ Set the minimum temperature at the higher control unit with the
modulation controller 5 K higher than the lower boiler water temperature;
see operating conditions.
Enable boiler, butterfly valve
Contact at terminals 2 and 3 of plug aVH
■ Contact closed:
Initially, the preheat function for lag boilers is activated.
After the preheat function has expired, the minimum boiler water
temperature will be maintained and the burner stages can be controlled
externally.
■ Contact open:
The butterfly valve is closed after approx. 5 min.
Burner stages cannot be switched ON externally; a minimum temperature
will not be maintained.
F
Adjustments at the Vitotronic 100
Code "01:3".
The high limit safety cut-out settings and other settings depend on the
system equipment level and the safety equipment to EN 12828 or
EN 12953.
A Plug to the control unit
B Enable boiler
Butterfly valve "open" or "closed"
C Burner stage 1 (base load) "ON"
D Reduce burner output (modulation controller)
E Raise burner output (modulation controller)
F Plug to the burner
Colour coding to DIN IEC 60757
BK black
BN brown
BU blue
High limit safety cut-out 110 °C 100 °C
Temperature controller 100 °C 87 °C
Coding address "06" for electronic maximum
95 °C 85 °C
temperature limit (Vitotronic 100)
Maximum temperature of the on-site control
unit
90 °C 80 °C
Note
A safety temperature of 120 °C (EN12953) is only permissible with an
additional, self-monitoring high limit safety cut-out. For an accessory
pack for safety temperature 120 ºC, see Viessmann pricelist.
Hook-up of on-site control equipment via LON
The Vitotronic control units are equipped with an open standard interface
"LON" (Local Operating Network).
This universal, decentralised network for automated building control
systems not only allows communication between Vitotronic control
units, but also the hook-up of on-site systems and devices from various
manufacturers.
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74 VIESMANN OIL/GAS BOILERS

Control units (cont.)
It enables, for example, individual room control units or building management
systems to be directly connected to Vitotronic control units.
Further modifications, extensions and maintenance work can be carried
out at any time with the system in operation.
Appendix
12.1 Safety regulations and requirements
Notification and required permits
Federal Immissions Act (BImSchG) [Germany]
According to paragraph 4 onwards of the Federal Immissions Act, in
conjunction with the 4th BImSchV, a permit is required (see point 8)
for combustion equipment with the following combustion output and
for the use of the following fuels:
■ Solid or liquid fuels (except fuel oil EL) with a combustion output from
1 MW,
■ Fuel oil EL and gaseous fuels with a combustion output from
20 MW
Permit requirement and testing to the Health & Safety at Work Act (BetrSichV) [Germany]
Extract from the Health and Safety at Work Act (BetrSichV) [Germany]
paragraph 13 to 15
13 Permit requirement
(1) Assemblies with fired or otherwise heated pressure devices that
are at risk of being overheated, used for the generation of steam
or hot water with a temperature in excess of 110 ºC, which must
be classified according to appendix II, diagram 5 of the Directive
97/23/EC as category IV (see Declaration of Conformity in the
product documentation of Viessmann boilers), require a permit
by the appropriate authority (generally the Planning Authority in
your locality).
(2) Apply for permits in writing. The permit is deemed to have been
granted if the relevant authority has not objected to the system
installation within a period of 3 months.
Paragraph 15 Recurring tests
(8) For pressure equipment and assemblies that are classified in
accordance with Directive 97/23/EC and diagram 5 as category
III, implement the following tests, subject to the product of max.
permissible pressure Ps and the crucial volume V being greater
than 1000 bar · l or if they are classified as category IV:
– external inspection no later than 12 months after commissioning
– internal inspection no later than 3 years after commissioning
(water pressure test possible as alternative. For max. test
pressure, see type plate)
– strength test no later than 9 years after commissioning.
Paragraph 14 Inspection prior to commissioning
(1) The user must ensure that a system requiring supervision (all
pressure equipment to 97/23/EC) is tested by an authorised
testing authority for compliant status.
(3) Tests in accordance with (1) can be carried out by an authorised
person on pressure equipment and assemblies that are to be
classified in accordance with Directive 97/23/EC and diagram 5
as category I or II.
12
5822 426 GB
General information regarding low pressure hot water boilers with safety temperatures of up to
110/120 ºC
The pressure equipment (hot water boiler) has been built in accordance
with TRD 702 and should be equipped in line with these Technical
Regulations. Observe the operating conditions in these Technical
Regulations. Subject to type, this boiler meets the following standards
regarding its stated rated output and technical requirements:
■ DIN 4702 or EN 303
(See details on the type plate and the enclosed documentation). During
installation and commissioning of these boilers, observe all local
Building Regulations and regulations concerning combustion systems,
as well as the following Standards, Regulations and Directives:
■ DIN 18160-1: Flue system (design versions).
■ DIN 1988: Technical Regulations for Drinking Water Installations
(TRWI).
■ DIN 4753: DHW systems for DHW and process water.
■ EN 12828: Heating systems in buildings – Design of hot water heating
systems.
■ EN 13384: Flue systems – Thermal and flow calculations.
■ Also observe EN 12953 with:
– Low pressure hot water boilers with safety temperatures > 110 to
120 ºC.
■ EN 12953-1: Boilers with large water chambers – General information.
■ EN 12953-6: Boilers with large water chambers – Equipment
requirements.
■ EN 12953-7: Boilers with large water chambers – Requirements for
combustion systems for liquid or gaseous fuels for the boiler.
■ EN 12953-8: Boilers with large water chambers – Safety valve
requirements
■ EN 12953-10: Boilers with large water chambers – Feed water and
boiler water requirements
Use of oil combustion
■ DIN 4755: Oil combustion equipment.
■ DIN 4787-1: Atomising oil burner (in excess of 100 kg/h throughput).
■ DIN 51603-1: Liquid fuels; fuel oil EL, minimum requirements.
■ EN 230: Atomising oil burners as mono-block version – equipment
for safety, monitoring and control, as well as safety times.
■ EN 267: Pressure-jet oil burner.
Use oil combustion
■ EN 298: Burner control units for gas burners and boilers with or
without fans.
■ EN 676: Pressure-jet gas burner.
■ DVGW Code of Practice G 260/I and II: Technical rules for gas
quality.
■ DVGW-TRGI 2008: Technical rules for gas installations.
■ TRF 1996: Technical rules for LPG.
OIL/GAS BOILERS VIESMANN 75

Appendix (cont.)
Gas installation
The gas installation should be carried out by the registered installer in
accordance with the technical connection requirements stipulated by
the gas supply utility. Operate the system in accordance with the above
conditions.
Pipe connections
All pipe connections to the boiler should be made free from stress and
torque.
Electrical installation
Carry out the electrical connection and installation in accordance with
VDE regulations (DIN VDE 0100 and DIN VDE 0116), local regulations
and the technical connection requirements laid down by your electricity
supply company.
■ DIN VDE 0100: Installation of HV systems with rated voltages up to
1000 V.
■ DIN VDE 0116: Electrical equipment for combustion systems.
12
Operating instructions
According to EN 12828, section 5 and EN 12170/12171, the system
installer must produce operating instructions for the whole system.
Flue system
Only flue pipes that meet Building Regulations or that are CE-designated
may be used with condensing systems.
Energy Saving Ordinance (EnEV)
■ Paragraph 11 (2), oil and gas combustion systems ≤ 400 kW:
Compulsory for low temperature or condensing boilers with CE designation
that, according to the Declaration of Conformity, are identified
as low temperature or condensing boilers (in accordance with
Directive 92/42/EEC), for buildings, whose annual primary energy
demand is not limited in accordance with EnEV paragraph 3 (1).
German Immissions Order (BImSchV)
Combustion systems must be operated so that the limits stated in the
1st BImSchV of 26.01.2010 or the TA Luft – for systems listed in the
4th BImSchV of 11.08.2009 – will not be exceeded. The 1st BImSchV
applies to oil and gas combustion systems for heating buildings or
rooms with water as a heat transfer medium.
■ 1st BImSchV, paragraph 6
Section 3, oil and gas combustion systems
– Oil and gas combustion systems > 400 kW for heating buildings
or rooms:
The manufacturer must certify that the efficiency is ≥ 94 % (calculated
to EN 303–5, version 6/1999).
– The requirements of section 3 are deemed to have been met for
boilers > 1 MW if the boiler efficiency is η K ≥ 94 % (calculated to
DIN 4702-2).
– The nitrogen oxide content of the flue gas in oil and combustion
systems:
For fuel oil EL:
Rated output in kW Emissions in mg/kWh
≤ 120 110
> 120 ≤ 400 120
> 400 185
For natural gas:
Rated output in kW Emissions in mg/kWh
≤ 120 60
> 120 ≤ 400 80
> 400 120
■ 1st BImSchV, paragraph 11a
Oil and gas combustion systems from 10 MW to 20 MW: Single
combustion systems with a combustion output between 10 and
< 20 MW may only be operated, if the emission values in the following
table (as average values over half an hour) are not exceeded:
5822 426 GB
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Appendix (cont.)
Fuel oil EL Natural gas Alternative gases Operating temperature
CO ≤ 80 mg/m 3 flue gas ≤ 80 mg/m 3 flue gas
NO X ≤ 180 mg/m 3 flue gas ≤ 100 mg/m 3 flue gas < 110 ºC
≤ 200 mg/m 3 flue gas ≤ 110 mg/m 3 flue gas 110 ºC to ≤ 210 ºC
≤ 200 mg/m 3 flue gas depending on the operating temperature
Checks as part of the Building Regulations approval process
As part of the Building Regulations approval process, condensing
combustion equipment is tested by the flue gas inspector (where applicable)
for adherence to Building Regulations and any general recognised
technical rules to be observed.
The State Building Regulations, their implementation orders and the
combustion equipment orders, as well as the general building approvals
and permits of the higher supervisory authority, in individual
cases, are part of the Building Regulations requirements.
12
5822 426 GB
OIL/GAS BOILERS VIESMANN 77

Keyword index
A
Anti-corrosion measures..................................................................47
Attenuating airborne noise...............................................................44
Attenuating structure-borne noise....................................................44
Auxiliary functions......................................................................70, 71
B
Blocking, external.......................................................................70, 71
Boiler blocking..................................................................................71
Boiler circuit pump............................................................................29
Boiler control units............................................................................49
Boiler cover......................................................................................28
Boiler enable in multi-boiler systems................................................68
Boiler sequence...............................................................................71
Boiler thermometer...........................................................................31
Building Regulation acceptance process.........................................77
Building Regulations Approval [Germany].......................................37
Burners.............................................................................................32
Butterfly valve.............................................................................73, 74
C
Certificate.........................................................................................37
Chemicals for corrosion protection...................................................47
Chimney diagrams...........................................................................33
Combustible fuel..............................................................................28
Combustion air.................................................................................27
Combustion Order............................................................................32
Contact thermostat...........................................................................64
Control panels..................................................................................49
Control thermostat............................................................................31
Control units.....................................................................................49
Corrosion..........................................................................................47
Corrosion on the water side.............................................................47
D
Defaulting an additional set boiler water temperature......................68
Defaulting an additional set value....................................................68
Delivery............................................................................................27
Design..............................................................................................28
Diaphragm expansion vessel...........................................................47
Divicon heating circuit distributor.....................................................29
E
Efficiency Directive.........................................................5, 7, 9, 10, 11
Emergency stop switch....................................................................28
Enable boiler..............................................................................73, 74
Energy Saving Ordinance (EnEV)....................................................76
EnEV....................................................................................56, 58, 60
Expansion vessel.......................................................................29, 47
External blocking........................................................................70, 71
External burner start.............................................................72, 73, 74
External changeover of multi-stage/modulating burners..................71
External demand........................................................................70, 71
External fault messages...................................................................67
External heating program changeover.......................................70, 71
External load-dependent starting...............................................70, 71
External starting subject to load.......................................................72
F
Federal Immissions Act (BImSchG) [Germany]...............................75
Flash trap.........................................................................................31
Flow temperature.......................................5, 6, 7, 8, 9, 10, 11, 28, 45
Flue gas temperature sensor...........................................................35
Flue system......................................................................................38
Flue system for condensing boilers..................................................35
Fuel..................................................................................................31
Function extension.....................................................................67, 68
G
Gas Appliances Directive.......................................5, 6, 7, 8, 9, 10, 11
German Immissions Order (BImSchV).............................................76
H
Halogenated hydrocarbons..............................................................27
Handling...........................................................................................27
Health & Safety at Work Act (BetrSichV) [Germany].......................75
Heating circuit distributor , 29
■ Divicon..........................................................................................19
Heating circuit pump........................................................................29
Heating connections.........................................................................29
Heating program changeover.....................................................70, 71
High limit safety cut-out....................................................................31
I
Immersion thermostat......................................................................64
Installation room...............................................................................27
L
Low-end boiler water temperature.........................5, 6, 7, 8, 9, 10, 11
Low water indicator..........................................................................31
M
Maximal pressure limiter..................................................................31
Maximum pressure limiter................................................................31
Minimum pressure limiter.................................................................31
Mixer open.................................................................................70, 71
Modulating burner......................................................................72, 74
Modulating burner connection....................................................73, 74
multi/stage/modulating burner..........................................................71
Multi-boiler system...........................................................................73
Multi-boiler systems.........................................................................51
N
Night contact....................................................................................68
Noise attenuating accessories.........................................................44
O
On-site control unit.....................................................................72, 73
Operating conditions..............................................5, 6, 7, 8, 9, 10, 11
Outside temperature sensor.............................................................54
P
Permit requirement in accordance with the BetrSichV [Germany]
.........................................................................................................75
plug aVD...........................................................................................71
Plug aVD..........................................................................................70
Plug aVH..........................................................................................70
Positioning........................................................................................27
Pump-controlled pressure maintaining systems..............................29
R
Raising the efficiency.......................................................................47
Requirements of the installation room..............................................27
Requirements of the Sample Combustion Order [Germany]...........32
Return temperature raising facility...................................................30
Room temperature sensor...............................................................66
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Keyword index
S
Safety equipment.............................................................................30
Safety precautions...........................................................................28
Safety temperature.....................................................................28, 31
Saline water.....................................................................................45
Set boiler water temperature............................................................68
Shunt pump......................................................................................29
Single boiler system.........................................................................72
Single boiler systems.......................................................................50
Sizing...............................................................................................33
Sound insulation...............................................................................44
Standard seasonal efficiency [to DIN]....................5, 6, 7, 8, 9, 10, 11
Starting, load-dependent............................................................70, 71
Starting subject to load.....................................................................72
Switching a feed pump.....................................................................68
Switching output...............................................................................68
Switching points...............................................................................53
System accessories.........................................................................29
T
Temperature sensor
■ Outside temperature.....................................................................54
■ Room temperature........................................................................66
Tests according to the BetrSichV [Germany]...................................75
Therm-Control........................................................................5, 7, 8, 9
Thermostat
■ Contact temperature.....................................................................64
■ Immersion temperature.................................................................64
Third party cascade..........................................................................68
Time switch................................................................................56, 60
Two-stage burner.......................................................................72, 73
V
Vitotrol
■ 200................................................................................................65
■ 300................................................................................................65
W
Water quality, standard values.........................................................44
Water treatment...............................................................................47
Water with a low salt content...........................................................45
5822 426 GB
OIL/GAS BOILERS VIESMANN 79

Printed on environmentally friendly,
chlorine-free bleached paper
Subject to technical modifications.
Viessmann Werke GmbH&Co KG
D-35107 Allendorf
Telephone: +49 6452 70-0
Fax: +49 6452 70-2780
www.viessmann.com
Viessmann Limited
Hortonwood 30, Telford
Shropshire, TF1 7YP, GB
Telephone: +44 1952 675000
Fax: +44 1952 675040
E-mail: info-uk@viessmann.com
5822 426 GB
80 VIESMANN OIL/GAS BOILERS