Pr - Solution Solartechnik GmbH

Technische Alternative
elektronische Steuerungsgerätegesellschaft
mbH. A-3872 Amaliendorf, Langestr. 124, Fax 02862
aal
SINGLE-CIRCUIT UNIVERSAL CONTROL
SYSTEM YSTEM
The UVR31 unit is designed for simple solar water heating systems and other heating
facilities (storage tank charging, preparation of water for domestic use). The required
control function is selected by entering the code of the corresponding connection
scheme.
The control unit has the following functions:
� 3 inputs for temperature sensors
� suitable for sensors of type KTY (Std) and PT1000
� two adjustable thermostat thresholds
� connectable pump speed control
� system start function
� system function test
� second output possible using auxiliary relay
� all switching hystereses are adjustable and depend on temperature
� adjustable OFF delay period for pump
� can also be used as a solar heating control system for swimming pools
� surge protection at all inputs
� connection possible of calorimeter EEG30 or TFM66 remote display
UVR31
Vers. E2.6
� data transmission line for temperature evaluation on PC via converter module

PLEASE NOTE:
The hydraulic diagrams shown in this booklet represent schematic
drawings. In no way do they describe or replace specialist systems
planning, which is why their functioning cannot be guaranteed even if
copied directly.

Contents:
General 4
Introduction 4
Control panel 4
Hydraulic diagrams 5
Diagram 0 - simple solar water heating system 5
Diagram 16 - charge pump control 6
Diagram 32 - burner control system 7
Diagram 48 - speed-controlled generation of warm water
with external heat exchanger 8
Installation 9
Sensor installation 9
Installation of the device 11
Electrical connection 11
Data transmission line 12
Auxiliary relay (HiRel) 13
Additional functions 14
What does the setting mode contain? 14
Programming diagram of UVR31 control system 15
Sensor type 16
Overtemperature limitation 17
Start function 18
OFF delay period for pump 19
Hystereses 19
Speed control 20
Programming diagram of speed processor 23
Appendix 24
Table of settings 24
Technical data 25
Scope of supply 25
In the event of malfunctioning 26
Maintenance 27
Safety regulations 27

General
Introduction
The following pages show diagrams indicating the assignment of sensors, pumps and
settings as well as corresponding program numbers.
To enter these numbers, the temperature selector key must be pressed for two seconds.
Three small lamps (T1 - T3) light up to show that setting mode has been selected. The program
number now appears in the display (e.g. P24). The required number can be set with
the output key. Depress the temperature selector key again for two seconds to terminate
input. The device then returns to normal operation.
IMPORTANT: In setting mode, it is possible to switch to other settings. All these values
have been set to a standard system in the factory. They generally do not have to be changed.
As additional functions may change the properties of the control system entirely, they
should be left to an expert.
The factory setting (FS) can be restored at any time by pressing the temperature selector
key while plugging in. After this, however, the program number has to be set.
Control panel
Using the output key, it is possible to change output status:
Auto illuminated = automatic mode - output indicates mode
Auto dark = manual mode - output indicates continuous operation or stopping
diff1: The differential temperature is the amount by which the energy generator (e.g. solar
collector) has to become hotter than the consumer unit (e.g. hot water tank) for the
pump to run. Normally a value between 5 and 10°C is selected. This is largely influenced
by tube length, insulation, sensor installation and the consumer unit. Hysteresis
has an upward effect, i.e. on reaching differential temperature plus hysteresis
temperature, the pump motor is switched on and on falling below the differential it is
switched off.
Depending on the selected diagram, one of the following two functions results:
max/: The maximal thermostat function limits storage tank charge as a protection against
calcification, destruction of tank coating, scalding, etc. Hysteresis has a downward
effect, i.e. switchoff on reaching threshold temperature and switchon on falling below
threshold temperature less hysteresis temperature.
min: The minimal threshold is provided to protect against boiler sooting. It should be between
60 - 70 °C. Its assignment to a circuit depends on the selected diagram. Hysteresis
has an upward effect, i.e. switchon when threshold temperature plus hysteresis
temperature is reached and switchoff on falling below threshold temperature.
Int C: This function (additional thermostat threshold) can only be reached via the programming
level (see program selection). Depending on the program selected, this value
also acts as a max or min threshold.
4

Hydraulic diagrams
The auxiliary relay HiRel which is repeatedly mentioned in the following pages is a module
which is obtainable as a special accessory and can be integrated into the device, allowing a
second (auxiliary) output to be set up.
Diagram 0: Simple solar water heating system FS = program 0
Sensor:
T1....... collector
T2....... lower part of storage tank
T3....... freely usable
Required settings:
diff....... collector T1 - storage tank T2
max..... limitation - storage tank T2
int C.... see programs 2 to 5
Program 0: Output A1 works according to the diagram. When a fault occurs, the auxiliary
relay (HiRel - special accessory) switches to sensor fault or too high a temperature differential,
depending on the function test. Furthermore, when a fault occurs, an error code is displayed
every second alternately to the usual readout.
Error codes are discribed on page 26 - In the event of malfunctioning.
Program 1: By installing sensor T3 on the solar feed line, an additional function control is
possible for circulation problems.
Program 2: The auxiliary relay switches when T2 exceeds threshold C.
Program 3: The auxiliary relay switches when T3 exceeds threshold C.
Program 4: A1 is given an additional minimum threshold at T1 with C.
Program 5: A1 is given an additional minimum threshold at T3 with C.
Program 8: Bypass function - the auxiliary relay switches a bypass valve if (feed) sensor T3
is higher than T2 by diff and solar pump A1 is running.
Program 9: A1 switches if T1 (radiation sensor - special accessory) exceeds the minimum
threshold C and T2 is below max. Bypass function - the auxiliary relay switches a bypass
valve if (feed) sensor T3 is higher than T2 and T2 is below max.
Program 10: A1 has the same function as Programm 9. Bypass function - the auxiliary relay
switches a bypass valve if (feed) sensor T3 is higher than T2 and A1 ist active.
Important: Regardless of the settings, the following holds: If T1 exceeds a set threshold of
140 °C, output is blocked until T1 has fallen below 120 °C. This function can be found in the
menu 'Utb' and can be changed or also deactivated there.
5

Diagram 16: Storage tank charging from boiler.
Sensor:
T1....... boiler
T2....... lower part of storage tank
T3....... freely available
Required settings:
diff....... boiler T1 - storage tank T2
min...... switch-on threshold - boiler T1
Int C.... various functions acc. to prog.
Program 16: A1 works according to the diagram. The auxiliary relay (HiRel - special accessory)
allows a minimal thermostat function to be set up by T1 and C.
Program 17: The auxiliary relay switches when T3 exceeds the minimum threshold C.
Program 18: A1 is given an additional maximum limit with T2 and C.
Program 19: A1 is given an additional maximum limit with T3 and C.
Program 20: T3 sits in the return and the auxiliary relay is used for raising the temperature
of the water in the return pipe. It switches when T1 > min & T3 < C.
All programs +8: Storage tank charging from two sources (boiler). A1 also switches if T3 is
higher than T2 by the differential.
All programs +12: Storage tank charging from two sources as with +8 with additional minimum
threshold, i.e. A1 also switches if T3 > C & (T3 + diff) > T2.
6

Diagram 32: Burner request by means of two storage tank sensors.
Sensor:
T1........ boiler
T2........ upper part of storage tank
T3........ lower part of storage tank
Required settings:
max/min..switch-on threshold T2
and switch-off threshold T3
Int C....... various functions acc. to prog.
Program 32: Function according to diagram. Request with max/min on T2 and switch off
with the same threshold at T3. The auxiliary relay switches when T1 increases beyond
threshold C.
Important: For many applications, program 40 (32 + 8) is more suitable due to the zero-potential
output of the auxiliary relay.
Program 33: Request with max/min on T2 and switch off with threshold C on T2.
Program 34: Request with max/min on T2 and switch off with threshold C on T3.
Program 40: The auxiliary relay as a zero-potential contact receives the original function of
the burner request from A1. Thus the standard output A1 can be used to control the charge
pump.
A1 switches if T1 > C & (T1 + diff) > T2
Program 41: Combines the functions of programs 33 and 40. Request via the auxiliary relay
with max/min at T2 and switch off with threshold C also at T2.
A1 (charge pump) switches if T1 > 45°C & (T1 + diff) > T2
Program 42: Combines the functions of programs 34 and 40. Request via the auxiliary relay
with max/min at T2 and switch off with threshold C at T3.
A1 (charge pump) switches if T1 > 45°C & (T1 + diff) > T2
Program 44: The auxiliary relay as a zero-potential contact receives the original function of
the burner request from A1. Thus the standard output A1 can be used to control the charge
pump. Unlike program 40, comparison is made here with T3.
A1 switches if T1 > C & (T1 + diff) > T3
Program 45: Similar to the sum of programs 33 and 46. Request using the auxiliary relay
with max/min at T2 and switch off with threshold C also at T2.
A1 (charge pump) switches if T1 > 45°C & (T1 + diff) > T3
Program 46: Similar to the sum of programs 34 and 46. Request using the auxiliary relay
with max/min at T2 and switch off with threshold C at T3.
A1 (charge pump) switches if T1 > 45°C & (T1 + diff) > T3
7

Diagram 48: Speed-controlled generation of warm water with external heat exchanger
Sensor:
T1........ warm water
T2........ flow switch STS01DC
in cold water inlet
T3........ top reservoir
Required settings:
diff...T1 - T2 (does not work through STS)
max..... warm water limit T1
recommended value: min. 80 °C
Absolute and differential control active
Program 48: The flow switch (STS01DC = special accessory) allows the control device to
detect water depletion and switch on pump A1. T1 is then held constant at the input absolute
value using the speed control device. If reservoir temperature T3 falls, the controller
keeps the set difference between T3 and T1 constant (in speed control menu F31 u. d.) in
order to prevent any mixing of the reservoir as a result of excessively high volume flow rates.
Program 49: As program 48 but with a start function. If T1 falls below the internal threshold
C and if T3 is over 50 °C, the pump runs until T1 has reached temperature C.
IMPORTANT:
Sensor T1 has to react quickly, which is why a special, high-speed sensor (BFS - special
accessory) is required. A T-piece should be used to stand the sensor immersion sleeve in
the heat exchanger outlet, in order to achieve a fast reaction.
Furthermore in the 'speed processor' menu (Pdr), it is essential to adjust the PID controller
according to the following procedure:
With a system ready for operation and with the appropriate temperatures at the time of
testing, the pump should run in automatic mode (water tap on).
Setting A-1 and c50 (i.e. T1 is kept constant at 50 °C).
While In and di are zeroed, the proportional part Pr is reduced every 30 seconds starting
from 9 until the system becomes unstable, i.e. the pump speed changes rhythmically. This
process can easily be observed in menu section n (= display of current output speed). The
proportional part where instability starts is noted as Prkrit, while the duration of the vibration
(= time between two top speeds in relation to n) is noted as tkrit. The following formulae
allow the correct parameters to be determined:
typical: 8 9 3
With the computed values, the system will run in a largely stable manner.
8
Pr = 1, 6 % Prkrit In = tkrit % Pr
20
di =
Pr % 8
tkrit

Installation
Sensor installation:
For the system to function correctly, it is very important that sensors are located and
installed properly. Make absolutely sure that they are completely pushed into the immersion
sleeves. The clip-on sensors must be well insulated in order to prevent them from being
influenced by the ambient temperature.
When used outdoors, no water should be allowed to get into the immersion sleeves (danger
of frost). The sensors should generally not be exposed to moisture (e.g. condensation)
as this can diffuse through the cast resin and damage the sensor. Heating at approx. 90 °C
for one hour may possibly save the sensor.
When used in NIRO storage tanks or swimming pools, make absolutely sure that immersion
sleeves are corrosion-resistant.
� Collector sensor (red cable): Either push into a tube which is soldered or riveted directly
to the absorber and projects from the collector housing, or place a T-piece on the flow collecting
tube of the outer collector, insert an immersion sleeve into this together with cable
connection (=moisture protection) and push in the sensor. For vacuum tube collectors, use
of PT1000 sensors is recommended.
� Boiler sensor (boiler flow): This is either screwed into the boiler with an immersion
sleeve or fitted to the flow pipe at a slight distance from the boiler.
� Hot water tank sensor: In the case of ribbed pipe heat exchangers, the sensor required
for the solar water heating system should be used with an immersion sleeve just above the
exchanger and, with integrated bare tube heat exchangers, in the lower third of the exchanger
or should be fitted at the exchanger's return outlet so that the immersion sleeve goes
into the exchanger tube. The sensor which monitors hot water tank heating from the boiler
is installed at the height corresponding to the required quantity of hot water in the heating
period. In no way is installation permissible beneath the corresponding register or heat
exchanger.
� Storage tank sensor: The sensor required for the solar water heating system is installed
in the lower part of the storage tank just above the solar heat exchanger with the help of the
immersion sleeve supplied. As a reference sensor for heating hydraulics, it is advisable to
insert the sensor with the immersion sleeve between the centre and top third of the storage
tank, or push beneath the insulation - keeping close to the tank wall.
� Pool sensor (swimming pool): Place a T-piece on the suction line directly at the pool
outlet and screw in the sensor with an immersion sleeve (check corrosion resistance of the
material used). Another possibility would be to attach the sensor at the same place by
means of clips or adhesive tape, using appropriate thermal insulation against environmental
influences.
� Clip-on sensors: Best secured to the appropriate line with pipe clamps, clips, etc.
whereby you must make sure that the material is suitable (non-corrosive, heat-proof, etc.).
Finally, the sensor must be well insulated in order to measure pipe temperature accurately
and to prevent any influence from ambient temperature.
9

� Hot-water sensor: When the control unit is used in systems for generating hot-water by
means of an external heat exchanger and a speed-controlled pump, a fast response to
changes in water quantity is vital. This is why the hot-water sensor must be placed as close
as possible to the heat exchanger outlet. Use a T-piece to insert the immersion sleeve into
the outlet. Furthermore, use of a fast-response sensor is recommended (BFS - special
accessory).
Sensor lines with a diameter of 0.75 mm2 can be extended up to 50m and above this
with 1.5 mm2. A connection between sensor and extension can be established as follows:
Push the shrink-fit hose provided (halved to 4 cm) over one core, twist the bare wire ends
firmly and then push the shrink-fit hose over the bare part and carefully warm up (e.g. with a
cigarette lighter) until the hose fits tightly over the connection. This connection can then be
drawn easily into the pipework.
10

Installation of the device
IMPORTANT! ALWAYS WITHDRAW PLUG FROM MAINS BEFORE OPENING THE
HOUSING!
Undo the four screws at the corners of the housing. The control electronics are located in
the cover and are connected to the supply module situated in the housing trough by means
of a flat cable. The housing trough can be screwed to the wall (with cable lead-ins downwards)
through the two holes on the underside, using the fixings provided. The supply
module can be removed from the trough to allow easier handling.
Elektrical connection:
This should only be done by a specialist according to relevant local guidelines. Sensor
lines should never be routed together with the line voltage in one cable. When a cable
duct is shared, suitable shielding must be ensured.
Caution: Work inside the control system should only be done when deenergized. It is
possible to damage the unit if it is assembled under voltage.
All sensors and pumps or valves must be connected according to their numbering in the
selected diagram.
If required, the device is also supplied with a relay output. In this case, terminal Ö (K2) is
connected with the break contact and K4 marks the make contact.
11

All sensor earthing is interconnected internally and can be exchanged at random.
Note: To protect against lightning damage, the system must be earthed according to
regulations. Sensor failures due to the weather or electrostatic charging are mostly due to
poor earthing.
At the request of the customer, some devices are fitted with sockets on the left side of
the housing. The lower socket is a parallel connection for the collector sensor. This allows
the device to be wired to the storage tank in the factory, dispensing with any need to open
up the device on-site.
The upper socket is for the data transmission line (also connected parallel to the internal
terminal) and allows easy connection of an interface converter module (UVS232 - special
accessory) for service purposes or for troubleshooting.
Data transmission line (DL)
The data transmission line was specially developed for the series UVR and is only compatible
with these products. Designed purely as an output line, it has the following use:
�To connect remote display TFA6 or TFA66. This is necessary if indication of all temperatures
at another location is also required. The data transmission line allows the remote display
to be supplied with the necessary energy and data using a two-wire line (such as the
sensor cable).
�To connect calorimeter EEG30. This is thereby supplied with the required energy and
receives the data for its integrated remote indication and the hours-run meter.
�As interface to the personal computer via the usual serial input (RS 232) for entering temperatures
measured. For this, converter module UVS 232 is necessary, which converts
signals into a form corresponding to the RS 232 norm.
12

Auxiliary relay (HiRel)
The control system has a five-pin connector on the supply module and a retaining groove
in the housing for subsequently fitting this additional relay module. This allows a switch
contact to be provided in parallel to existing outputs.
In order to achieve the required link with the corresponding outputs, the module has a pin
connector with plug-in jumpers.
It is irrelevant here whether one speed-controlled
output of the control system is involved or several
outputs at the same time.
If A1 is connected, the relay also switches with
the original output. Connecting A2 (as illustrated in
the diagram alongside) results in an additional
output of equal value.
Usually the module is used:
W.....root
S...... make contact
O......break contact
� as additional output for a bypass valve
� as a switch contact parallel to the (activated) speed output
� as a zero-potential (deenergised) contact for the burner request
To be correctly connected to the supply module of the control system, the flat cable must
not be twisted.
13

Additional functions
A setting mode allows additional functions for optimising the solar water heating system
or other heating facility. As these functions can change the properties of the control system
fundamentally, they should only be dealt with by specialists or at least by persons who
are sufficiently familiar with these instructions. It should also be noted that not every
additional function is advisable for every program.
�� Entry into setting mode (first menu level):
If you press approx. two seconds on the yellow temperature selector key, the computer
switches to setting mode. All temperature selection lamps (T1 - T3) are illuminated to indicate
readiness for programming and the program number P.. appears in the display. This
two-digit number is necessary for all basic control functions and has already been explained
on page 3.
�� Advancing:
Press the temperature selector key briefly to advance from one setting value to the next.
�� Changing:
Press the output key once to increase the value. Hold it down to count upwards.
�� To quit setting mode:
To return to normal mode, press the temperature selector key again for at least two
seconds in the displays Pxx, Cxx, Exx or End. The system also returns to normal mode
within one minute if no key is pressed.
�� Restoring factory setting (FS):
The factory setting can be restored by pressing the temperature selector key while plugging
into the mains. After this, however, it is essential to set the program number.
What does the setting mode consist of?
Beside program number P, there is also the additional thermostat threshold C at this
level. This only appears, however, if a program number has been set which requires this
threshold.
This level also contains the computer code (e.g. E1.1). This is an extremely important
code for the manufacturer and provides information about the 'intelligence' of the device. It
cannot be altered and must be notified to the manufacturer with every enquiry.
All other designations (SEn, Utb, StF, PnL, HSt, Pdr) allow you to enter these menus by
pressing the temperature selector key for two seconds.
All menu items and settings described below are suppressed by the control system if
they are not supported by the program number used or by the previous settings. Furthermore,
all figures listed are examples and can be changed unless explicitly stated otherwise.
The actual factory setting (FS = ....) is always indicated to the right of the display
description.
14
The device continues to operate normally even during the programming procedure.

Sensor type
High-quality solar collectors and especially vacuum tubes already reach standstill temperatures
between 200 and 350 °C. The standard sensors are semi-conductor types (series
KTY10) and are designed for a maximum short-term peak temperature of 200 °C, which is
generally sufficient for flat collectors.
For higher temperatures - especially in vacuum systems, however - the use of PT1000
sensors is recommended. The type offered by Technische Alternative allows a continuous
temperature of 250 °C and a short-term temperature of 300 °C. As there is a lower temperature
at the sensor's measuring point than inside the collector, especially at high temperatures,
due to heat dissipation, even standstill temperatures up to 350 °C do not constitute a
problem.
The SENSOR TYPE menu now allows individual sensor inputs to be switched between
semiconductor and PT1000 types.
Fault recognition
For the solar water heating diagram (diagram 0), fault recognition has been integrated
into programs 0 and 1 and can be switched on or off in menu sensor type SEn - see above .
This is actuated in the event of any sensor failure, short-circuit, too high a temperature differential
or circulation problems. When a fault occurs, an error code is displayed every
second in normal operation alternately to the usual readout.
16
Error codes on page 26.

Overtemperature limitation
Protection of the consumer unit (storage tank, swimming pool, etc.) by temperature limitation
is one of the most important functions of a solar heating control system. If the limitation
is actuated, the solar pump is switched off. The collector then warms up, possibly until
the heat transfer medium evaporates. If at this point hot water is taken out of the storage
tank, the storage tank sensor will fall below the set limiter temperature and the pump is
engaged again.
As the pump cannot generate the required pressure for raising the liquid level up to the
collector feed (highest point in system), circulation is impossible until the heat transfer
medium cools and condenses. The pump is thus 'stewing in its own juice' at this time, constituting
a considerable load and senseless waste of energy.
This function allows the pump to be blocked generally once a specified temperature
threshold is reached on the collector sensor, until the temperature falls below a second
threshold (also adjustable).
The higher temperature is the one which determines switch-off.
The lower temperature is the one which determines switch-on again.
The higher value can be adjusted from the lower threshold up to 199°C. When this is
exceeded, instead of a numerical value, the readout 'OFF' appears in order to deactivate the
function.
17

Start function
With solar water heating systems, it occasionally happens in the morning that the collector
sensor is flushed much too late by the warmed heat transfer medium, i.e. the system
may possibly start too late. Insufficient thermosiphon circulation mostly occurs in the case
of flat-mounted collector fields or winding interconnections of the absorber strips. This phenomenon
has a particularly negative effect in the case of forced flow vacuum pipes. Although
the sensor located in the flow collecting tube still detects a cold collector, steam may
already be generated. As the steam phase prevents any forced circulation, however, the
system then stands the whole day without doing anything.
The start function is the solution to this problem. At set intervals, the pump is operated for
several seconds. In order to avoid losses at night, interval operation is started when a specific
irradiation is reached (using radiation sensor LIS - special accessory) or with constant
monitoring of the collector temperature. The computer first tries to establish the actual
weather on the basis of continuously measured collector temperatures. This allows it to find
the correct time for a brief flushing interval in order to obtain the actual temperature for normal
operation.
The start function is deactivated in the factory and is only overlaid in connection with solar
water heating systems (i.e. with the diagram 0).
18

OFF delay period for pump
Particularly with solar water heating systems and other heating facilities equipped with
long hydraulic lines, the pumps may be subjected to extreme timing (constant switching on
and off) over a prolonged period during the start phase. This can be alleviated by targeted
use of speed control or by increasing the OFF delay period of the pump.
On entering the sub-menu PnL, the OFF delay period for the pump is displayed for output 1:
e.g. t1.3 - OFF delay period for output 1 is 30 seconds.
e.g. t13 - OFF delay period for output 1 is 3 minutes.
The OFF delay period is set in the factory at zero (T10).
Hystereses
Switching hysteresis is the difference between switch-on and switch-off temperatures.
This means that a thermostat with 10K hysteresis which is set at 70 °C switches off at 70
°C and on at 60 °C. Hystereses are not constant here, but change according to the temperature
measured and are adjustable from 1-9K per 64 °C. Changing according to temperature
has the advantage that it allows very different consumer units or storage tanks to be
used always with the same settings. Thus a swimming pool, the limit of which is set at
approx. 30 °C, receives a small hysteresis, while a storage tank, which only needs to be
limited at approx. 90 °C, receives a large hysteresis.
Example:
Max. thermostat for swimming pools set at 30 °C, Hyst = 3K/64°C = FS
A hysteresis of 3K per 64 °C results in approximately half at 30 °C, i.e. 1.5K
Charging is thus blocked at 30 °C and released again at 28.5 °C.
19

Speed control
Using pump speed control, it is possible to change the delivery rate - i.e. volume flow - of
conventional circulation pumps. This allows (differential) temperatures to be kept constant
within the system. The procedure is set up on a universal basis. Any sensors can be determined
and the appropriate temperatures can be entered. If activated, speed control is only
permitted if the usual differential and/or thermostat function releases output, i.e. it can be
regarded as a secondary device to the normal controller system.
A simple diagram can now be used to describe the many possibilities of this procedure:
�Absolute value control A = stabilisation of a sensor
Using the speed control device, T1 can be stabilised at one temperature very well (e.g. 60
°C). If solar radiation is reduced, T1 becomes colder. The controller thereupon reduces
speed and therewith flow rate. This however leads to a longer heating period of the liquid in
the collector, whereby T1 rises again.
Alternatively, in various systems (e.g. charging of the hot water tank from the storage
tank), a constant return (T2) is advisable. For this, inverse control characteristics (marked by
a minus) are required. If T2 increases, the heat exchanger transfers too little energy to the
storage tank. Flow rate is thus reduced. A higher dwell time in the exchanger cools the heat
transfer medium down more, and T2 thus falls.
Keeping T3 constant is not advisable in this example, as the variation in flow does not
have any immediate reaction on T3 and there is thus no functioning control circuit.
20

�Differential control F = keeping temperature between two sensors constant
Keeping the temperature differential constant between e.g. T1 and T2 leads to a 'sliding'
operation of the collector. If T1 falls as a result of irradiation becoming less, the differential
between T1 and T2 will thus also fall. The controller then reduces speed, which increases
the dwell time of the medium in the collector and thus the temperature at T1 increases. An
inversely written F denotes an inverse speed characteristic, i.e. speed increases as the differential
decreases.
This differential does not have anything in common with the differential at the front panel
apart from the fact that it always has to be set somewhat higher than the switching differential
in order to allow speed control to become active before the system is switched off by the
switching differential.
� Limiter function L = keeping a sensor constant only after a required temperature event
has occurred
If, for example, T3 has reached 60 °C, the collector should be kept at a required temperature.
Keeping constant works in the same way as absolute value control. An inversely written
L denotes an inverse speed characteristic, i.e. speed increases as temperature falls.
The three procedures described can also be activated together. Between absolute and
differential control, the slower speed 'gains' while the limiter function overwrites the other
functions when the event occurs.
In the schema described, the following functionality might be achieved:
Absolute value control has the effect of keeping T1 constant at e.g. 60 °C, in order to
obtain hot water with appropriately high temperature rapidly in a layer-type storage tank.
If T3 thus reaches e.g. 50 °C, the system should be switched to optimised efficiency operation,
i.e. the pump should run at full speed. This can be achieved, when T3 reaches 50 °C,
by the event function trying to keep T1 constant at 0 °C (!) This impossible input allows the
pump to run at top speed.
Signal type
The device allows you to choose between two signal types for motor control
Wave pack - for circulation pumps only. Here, based on a complex calculating
procedure, individual half-waves are sent to the pump motor. The pump is thus pulse-operated
and there is only 'full circulation' when past the moment of inertia.
Advantage: High dynamics of 1:10, well suitable for pumps from the manufacturers
DAB, KSB, Grundfoss and Wilo
Disadvantage: Linearity depends on loss of pressure, in some cases generation of
running noise, not suitable for pumps from the company Piral
Phase shift - for pumps and fan motors. Within each half-wave, the pump is connected
to the mains at a specific time (phase).
Advantage: Suitable for almost all types of motor
Disadvantage: With pumps, low dynamics of 1:3. The device has to be equipped
with a filter (approx. 3mH, 33nF = special accessory) in order to comply with European
regulations concerning electromagnetic compatibility.
21

Pump standstill
The wave pack procedure (standard) allows variation in volume flow by the factor 10 in 30
stages. Here, it must be noted that due to the return valves excessively low flows cause the
heat transfer medium to stop. Pumps also only have limited dynamics, i.e. if the power
switch is not set at maximum, the rotor may come to a stop at lower speed stages.
Sometimes a standstill can even be desirable, or at least it will not cause any damage,
which is why even stage 0 can be selected as a lower limit. If rotor standstill is not
desirable, a reasonable limit can be found by a simple test. - In the Pdr menu, select the
point u for the lower speed limit. During selection, the pump is actually driven at the speed
stage indicated in order to monitor the system. By removing the rotor cap, it is possible to
observe the rotor. Now the lower speed limit u is reduced until the rotor comes to a standstill.
Raising this limit by three stages will allow the pump to run reliably.
Stability problems
With few exceptions, the system will run in a largely stable manner. Stability conditions Pr,
di and In should therefore be left unchanged at works setting 5. In the event of any
instability, however, the controller must be adjusted as follows:
Let us suppose a system ready for operation with the appropriate temperatures at the
time of testing and with the pump running in automatic mode. While In and di are zeroed,
the proportional part Pr is reduced every 30 seconds starting from 9 until the system becomes
unstable, i.e. the pump speed changes rhythmically. This process can easily be observed
in menu section n (= display of current speed). The proportional part where instability
starts is marked as Prkrit, while the duration of the vibration (=time between the two top
speeds in n) is marked as tkrit. The following formulae allow the correct parameters to be
determined:
22
Pr = 1, 6 % Prkrit
di =
Pr % 8
tkrit
In = tkrit % Pr
20

Appendix
Table of settings:
Should there be an unexpected failure in the control system, the entire adjustment must
be repeated when commissioning. In such cases, it is possible to avoid problems if all settings
are entered in the following table. In the event of any queries, it is essential to refer
to this table. At the factory, faults can only be detected by simulation.
24
Basic functions: Overtemperature limitation Utb
Program version..... E2.6 Switchoff temperature ............ _____
Diagram ................ Switchon temperature ............ _____
Program P ............
Int. limit C ............. °C Start function StF
min/max................. °C Output A..... 1
diff......................... °C Radiation sensor input F..... _____
Sensor T1 ............. °C Radiation threshold c..... _____
Sensor T2 ............. °C Pump run-time r...... _____
Sensor T3 ............. °C Interval time i...... _____
Output ...................
OFF delay period for pump PnL
Sensor type Sen (if changed): for output 1 t1..... _____
Sensor F1.... °C
Sensor F2.... °C Hystereses Hst
Sensor F3.... °C for max/min H1...._____
Speed processor Pdr
for diff H2...._____
for internal threshold C H3...._____
Abs. value control A.... ______ Set value for A ...................... c...... _____
Differential control F.... ______ Set value for F ...................... d...... _____
Temperature limit L.... ______ Limit threshold for L ............. b..... _____
Wave form ...... ______
Proportional part Pr...______
Integral part In... ______
Differential part di... ______
Lower speed limit u... ______
Maximum value for L ...............h..... _____

Technical data:
Sensor: Semiconductor, linearised, precision: between 10 and 90°C: +-1°C
Storage tank sensor SF: 6 mm diameter, fits immersion sleeve provided, incl. 2 m cable
(long-term thermal stability to 90°C)
Collector sensor KF: 6 mm diameter, fits immersion sleeve provided, incl. 2 m silicon
cable (to 180°C) with connection box and overvoltage protection
Differential temp.: adjustable from 1 -13°C
Threshold value: adjustable from 20 - 110°C logarithmic
Hysteresis: adjustable from 1 - 9°C per 64°C
Speed control: 30 speed stages result in a change in quantity of max. 1:10.
The control may be set as follows: Absolute value; differential
value and absolute value when an event occurs.
Temperature display: -50 to +199°C
Resolution: from -9.9 to 100°C with 0.1°C, otherwise 1°C
Precision: typ. 0.4 and max. +-1°C in the range 0 - 100°C
Output : Triac
Switching capacity: 250V/1.5A (output and device jointly protected with 3.15A fast fuse)
Connection: 220V +-10%, 50 - 60Hz,
Power consumption: max 3 W
Scope of supply:
Device with 3 sensors (2 x SF, 1 x KF), 2 immersion sleeves, wall fixing material, shrinkfit
hoses
25

In the event of malfunctioning:
Due to the complexity of the device, many malfunctions may be caused by incorrect settings
or non-existent settings. For this reason, the main settings and terminal connections
should be checked:
� Are all sensors connected with the right terminals? Heat the sensor using a cigarette
lighter and check display.
� Check program number!
� Can the output be switched on and off in manual mode? It must be possible to engage
continuous operation and standstill, otherwise there might be a device error.
� Have the thermostat threshold and differential threshold already been reached (or not
yet)?
� Have values been changed in the sub-menus?
The factory setting can be restored at any time by pressing the temperature selector key
while plugging in. After this, however, the program number has to be set.
Fault recognition - Error code:
FF1......Interruption collector sensor T1 FF2......Interruption hot water tank sensor T2
FF3......Short circuit collector T1 FF4......Short-circuit hot water tank T2
FF5......The temp. differential between the collector and storage tank is over 40K after
the pump has been running for at least 10 minutes. Presumably no circulation!
FF6......Even though the pump has been standing for over 5 hours, T3 is still higher than
40 °C. Presumably there is a problem with circulation.
Description of fault recognition page 16.
As programs are constantly revised and improved, it is possible that there may be a difference
in sensor, pump and program numbering in relation to older documentation. For the
device supplied, only the enclosed directions for use are valid (identical serial number). It is
essential that the program version of the directions tallies with that of the device.
If the device does not operate despite voltage having been applied, check and if
necessary replace the 3.15A fast fuse protecting the control system and the output.
If the control system does not work properly in automatic mode, the cause of the problem
can usually be easily recognised by observing the temperature display. If a sensor indicates
an incorrect temperature (e.g. -99 in relation with a sensor short-circuit or 999 in relation
with an interruption), and all other values are plausible, the sensor should be checked. This
can be done on the terminal strip by exchanging the presumably defective sensor with one
that is working, and checking the display, or else its resistance can be measured with an
ohmmeter. Depending on temperature, this should show the following value:
T(°C) 0 10 20 25 30 40 50 60 70 80 90 100
R(Ohm) 1630 1772 1922 2000 2080 2245 2417 2597 2785 2980 3182 3392
If, despite inspection and monitoring according to the above information, the control
system should prove to be malfunctioning, please contact your dealer or get in touch with
the manufacturer directly. The cause of the problem can, however, only be located if, besides
submitting a description of errors, the settings table is completely filled in and, if possible,
also the hydraulic diagram of the system in question is made available.
26

Maintenance:
If handled and used properly, the device does not require maintenance. For cleaning,
only use a cloth moistened with mild alcohol (e.g. spirit). Harsh cleaning materials and solvents
such as chloroethane or trichloroethylene are not permitted.
As none of the precision-relevant components are subject to load when handled properly,
long-term drift is extremely low. The device therefore has no means of adjustment. Thus
calibration is not applicable.
In the event of repair, the structural features of the device should not be altered. Spare
parts must correspond to original spare parts and must be reinstalled to correspond to the
manufacturing status.
Safety regulations:
The device corresponds to state-of-the-art technology and complies with all required
safety regulations. It may only be implemented or used according to the technical data and
safety provisions and regulations indicated below. When using the device, legal and safety
provisions must also be observed that are necessary for the specific application in question.
Safe operation is no longer possible if the device
... shows visible damage
... is no longer functioning
... has been stored for a longer period under unfavourable conditions.
If this is the case, the device must be put out of action and safeguarded against
inadvertent operation.
Specifications subject to change without prior notice. © 1999
Guarantee
Technische Alternative GmbH, Amaliendorf, shall allow one year's guarantee on the
device purchased as of the date of purchase. This shall include the repair (but not the
expense of disassembly and installation) as a result of working and material errors
which are detrimental to functioning. This shall exclude any damage caused by excess
voltage, improper handling or by natural wear and tear.
Name: Date of purchase:
Address: Purchasing company:
Fault description:
27

28
Technische Alternative
elektronische Steuerungsgeräteges.m.b.H.
Langestraße 124
A-3872 Amaliendorf
Type: UVR31 Serial number: