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Weishaupt industrial burners
WK40 to WK70
for combustion air temperatures up to 250°C
1/2000 CA

General
Weishaupt WK type industrial
burners were developed to meet
special industrial and commercial
requirements. The burners are
suited for operation with or
without preheated combustion air
as required. Very high flue gas
temperatures occur on many
industrial processes (e.g. thermal
fluid boilers) due to the high
media temperatures. A
considerable amount of energy
can be recovered from the hot flue
gases by using a heat exchanger
in the flue gas system to recover
the heat. This technology can
result in improvements in
efficiency of up to 8%.
The burners are also often used on
installations without preheated
combustion air. Reasons for this could be
as follows:
● The customer requires a separate
combustion air fan.
● An industrial burner is specified.
● The resistances in the heat exchanger
are too high to use a monobloc burner.
● The combustion rating is too high to
use a monobloc burner.
Burner types WK40 and WK50
Burners operating with preheated
combustion air are supplied with an
insulated burner housing and a coolingair
fan unit, for which a separate coolingair
fan is supplied. An oil pump is fitted
on oil and dual fuel (oil/gas) burners and
residual oil burners are further equipped
with an electric preheater. On request,
the WK 40 burner can be supplied with a
separate pump and preheater assembly -
this is often the case with industrial
installations. The burner housing is not
insulated for burners operating at normal
combustion air temperatures.
Burner type WK70
Burners operating either at normal
combustion air temperatures or with
preheated combustion air are both fitted
with internal insulation as standard. For
burners operating at normal combustion
air temperatures the internal insulation
serves as a sound absorber and
consequently the burner noise level is
below 85 dB(A). The pump and
preheater assembly is supplied
separately.
Combustion air
max. 250° C
Picture showing boiler, heat exchanger and Weishaupt Industrial Burner
Insulated burner housing for
preheated combustion air
The insulation of the burner housing
prevents the emission of temperature
and noise. Even with combustion air
temperatures of 250 C, the surface
temperature of the housing is less than
100 C. On WK40 burners the oil pump
and, where applicable, the oil preheater
are fitted away from the burner housing
and are thus protected from the heat. A
separate cooling air fan is supplied to
cool the control unit and the flame
monitoring device.
Tried and tested components
Sizes 50 to 70 have the same mixing
assembly as is used on the size 50 to 70
Monarch burners.
Simple maintenance
Diffuser, ignition electrodes and the gas
mixing assembly are easily accessible
when the cover is opened. The flame
tube can also be taken out through the
opening in the housing once the mixing
assembly has been removed. The oil, gas
and air regulating components are neatly
arranged and are easily accessible.
Flue gas
Combustion air
fan
Heat exchanger
Boiler
Burner
Fuels
The oil burners fire distillate and residual
fuel oils to DIN 51 603 with a viscosity
up to 6 mm 2 /s at 20°C (distillate oil EL)
or 50 mm 2 /s at 100°C (residual oil S).
The gas and dual fuel burners are tested
for use with the following gases to EN
437 and DVGW Worksheet G260/I:
natural gas E (formerly designated
natural gas H) and natural gas LL
(formerly designated natural gas L), as
well as liquid petroleum gas.
General
Standard execution burners (material,
construction and protection) are
designed for operation indoors within a
temperature range of -10°C to +40°C
(details on special measures for oil
storage in sub-zero temperatures and on
operation outdoors are available on
request). There are various special
executions available on request, such as
additional equipment to comply with TRD
604 or new technologies such as
electronic compound regulation (ECR),
O 2 trim and speed control.
2

Improvement in
“combustion efficiency”
through heat recovery
Efficiency in % with flue gas temperature at 300°C/400°C in
relation to the combustion air temperature with air factor n = 1.1
250
200
Combustion air preheating °C
150
100
50
t A = 300°C
0
92 91 90 89 88 87 86 85 84 83 82 81
t A = 400°C
Efficiency %
Combustion efficiency without air preheating
Combustion air with air preheating
H u,n – V A,f · n · C¯¯ pA · t A
ηF = ·100 %
H u,n
H u,n – V A,f · n · C¯¯ pA · t A + V L · n · C¯¯ pL · t L
ηF = ·100 %
H u,n
with gas with oil
H u,n = nett calorific value kJ/m 3 kJ/kg
V A,f = combustion volume wet m 3 /m 3 m 3 /kg
V L = theoretical air requirement m 3 /m 3 m 3 /kg
n = air factor
t A = flue gas temperature °C
C¯¯ pA = average specific heat capacity of flue gas kJ/m 3
with gas with oil
H u,n = nett calorific value kJ/m 3 kJ/kg
V A,f = combustion volume wet m 3 /m 3 m 3 /kg
V L = theoretical air requirement m 3 /m 3 m 3 /kg
n = air factor
t A = flue gas temperature °C
t L = combustion air temperature °C
C¯¯ pA = average specific heat capacity of flue gas kJ/m 3
C¯¯ pL = average specific heat capacity of
combustion air kJ/m 3
Example without air preheating:
H u,n = 10.35 kWh/m 3 =ˆ 37 261 kJ/m 3
V A,f = 10.82 m 3 /m 3
V L = 9.91 m 3 /m 3
n = 1.1
t A = 400°C
C¯¯ pA = 1.424 kJ/m 3
ηF =
37 261 – 10.82 · 1.1 · 1.424 · 400
37 261
· 100 %
ηF = 81.8 %
Example with air preheating:
H u,n = 10.35 kWh/m 3 =ˆ 37 261 kJ/m 3
V A,f = 10.82 m 3 /m 3
V L = 9.91 m 3 /m 3
n = 1.1
t A = 400°C
t L = 250°C
C¯¯ pA = 1.424 kJ/m 3
C¯¯ pL = 1.315 kJ/m 3
ηF =
37 261–10.82 ·1.1 ·1.424 · 400 + 9.91·1.315·250
37 261
·100%
ηF = 91.4 %
Result:
Improvement of “combustion efficiency” by 9.6% through air preheating
3

Description
Regulation
The burners alter their capacity
proportionally, depending on the heat
requirement. Depending on the type of
control the burner is either:
■ sliding two stage (basic version)
■ modulating
The servomotor run time between partial
and full load is 42 seconds. With sliding
two stage regulation, the partial and full
load positions are fixed within the
regulating range. Depending on heat
demand, the burner slides to one load
point to the other, thus preventing rapid
cycling.
By fitting a suitable controller into the
control panel the standard sliding two
stage burner can be fully modulating.
Modulating burners operate at any load
point within the burner range, depending
on the heat required.
WKGL40/2-A
Increased safety due to nozzle head
shut off device with nozzle solenoid
A type tested shut off device is fitted in
the nozzle and shuts off the oil flow
directly in the nozzle orifice. No fuel oil
can leave the nozzle head, thus
increasing safety.
Nozzle recirculation on residual oil
burners
During prepurge on residual oil burners,
heated oil circulates through the nozzle
and oil line system so that on flame
establishment the oil is at the correct
temperature.
Precise oil temperature regulation
with a Weishaupt oil preheater
Weishaupt residual oil burners are fitted
with oil preheaters, which maintain the
preheated temperature and thus the fuel
viscosity constantly at the desired set
value. This results in uniform atomisation
and combustion efficiency.
WKGL40/2-A
Flame supervision
The burner control box, which is fitted in
the control panel, sequences burner
operation automatically. It monitors the
flame by means of a flame sensor.
4

Model overview
Types of regulation
WKGL 70/2-A
WKGL 70/2-A
5

Description, installation example
Burner types WK40 and WK50
Burners operating with preheated
combustion air are supplied with an
insulated burner housing and a coolingair
fan unit, for which a separate coolingair
fan is supplied. An oil pump is fitted
on oil and dual fuel (oil/gas) burners and
residual oil burners are further equipped
with an electric preheater. On request,
the WK 40 burner can be supplied with a
separate pump and preheater assembly -
this is often the case with industrial
installations. The burner housing is not
insulated for burners operating at normal
combustion air temperatures.
Burner type WK70
Burners operating either at normal
combustion air temperatures or with
preheated combustion air are both fitted
with internal insulation as standard. For
burners operating at normal combustion
air temperatures the internal insulation
serves as a sound absorber and
consequently the burner noise level is
below 85 dB(A). The pump and
preheater assembly is supplied
separately.
Remote heating centre with Weishaupt WKGL50 and WKGL3 dual fuel burners - total rating 28 MW
6
WKGL50 - Service-friendly compact construction

Weishaupt control panel type WS 1218/40
7

Model and capacity overview
Type WK40 - standard version
Burner Version Fuel Capacity range
type kW kg/h 0 500 1000 1500 2000 2500 3000 kW
WKL40/1 ZM Oil 450 – 2200 38 – 185
ZMH Oil 450 – 1800 38 – 152
WKMS40/1 ZM Oil 550 – 2200 50 – 195
ZMH Oil 550 – 1800 50 – 160
WKG40/1 ZM N-Gas, LPG 300 – 2200
ZMH N-Gas, LPG 300 – 1800
WKGL40/1 ZM Oil 450 – 2200 38 – 185
ZMH Oil 450 – 1800 38 – 152
ZM N-Gas, LPG 300 – 2200
ZMH N-Gas, LPG 300 – 1800
WKGMS40/1 ZM Oil 550 – 2200 50 – 195
ZMH Oil 550 – 1800 50 – 160
ZM N-Gas, LPG 300 – 2200
ZMH N-Gas, LPG 300 – 1800
1200 kW
1200 kW
1200 kW
1200 kW
1200 kW
1200 kW
1200 kW
1200 kW
1200 kW
1200 kW
1200 kW
1200 kW
1200 kW
1200 kW
WKL40/2 ZM Oil 650 – 3000 55 – 250
ZMH Oil 650 – 2500 55 – 210
WKMS40/2 ZM Oil 750 – 3000 67 – 266
ZMH Oil 750 – 2500 67 – 222
WKG40/2 ZM N-Gas, LPG 400 – 3000
ZMH N-Gas, LPG 400 – 2500
WKGL40/2 ZM Oil 650 – 3000 55 – 250
ZMH Oil 650 – 2500 55 – 210
ZM N-Gas, LPG 400 – 3000
ZMH N-Gas, LPG 400 – 2500
WKGMS40/2 ZM Oil 750 – 3000 67 – 266
ZMH Oil 750 – 2500 67 – 222
ZM N-Gas, LPG 400 – 3000
ZMH N-Gas, LPG 400 – 2500
1800 kW
1800 kW
1800 kW
1800 kW
1800 kW
1800 kW
1800 kW
1800 kW
1800 kW
1800 kW
1800 kW
1800 kW
1800 kW
1800 kW
20°C combustion air temperature
250°C combustion air temperature
The full-tone and half-tone areas together show the total ratings
range. When sizing burners ensure that the required nominal rating
lies within one of the full-tone areas.
N-Gas = Natural Gas E/LL
LPG = Liquid Petroleum Gas B/P
8

Model and capacity overview
Type WK50 - standard version
Burner Version Fuel Capacity range
type kW kg/h 0 1000 2000 3000 4000 5000 6000 kW
WKL50/1 ZM Oil 712 – 4000 60 – 337
ZMH Oil 712 – 3200 60 – 270
WKMS50/1 ZM Oil 1012 – 4000 90 – 356
ZMH Oil 1012 – 3200 90 – 285
WKG50/1 ZM N-Gas, LPG 600 – 4000
ZMH N-Gas, LPG 600 – 3200
WKGL50/1 ZM Oil 712 – 4000 60 – 337
ZMH Oil 712 – 3200 60 – 270
ZM N-Gas, LPG 600 – 4000
ZMH N-Gas, LPG 600 – 3200
WKGMS50/1 ZM Oil 1012 – 4000 90 – 356
ZMH Oil 1012 – 3200 90 – 285
ZM N-Gas, LPG 600 – 4000
ZMH N-Gas, LPG 600 – 3200
WKL50/2 ZM Oil 1125 – 6000 95 – 506
ZMH Oil 1125 – 5000 95 – 420
WKMS50/2 ZM Oil 1700 – 6000 150 – 534
ZMH Oil 1700 – 5000 150 – 445
WKG50/2 ZM N-Gas, LPG 800 – 6000
ZMH N-Gas, LPG 800 – 5000
WKGL50/2 ZM Oil 1125 – 6000 95 – 506
ZMH Oil 1125 – 5000 95 – 420
ZM N-Gas, LPG 800 – 6000
ZMH N-Gas, LPG 800 – 5000
WKGMS50/2 ZM Oil 1700 – 6000 150 – 534
ZMH Oil 1700 – 5000 150 – 445
ZM N-Gas, LPG 800 – 6000
ZMH N-Gas, LPG 800 – 5000
2000 kW
2000 kW
2000 kW
2000 kW
2000 kW
2000 kW
2000 kW
2000 kW
2000 kW
2000 kW
2000 kW
2000 kW
2000 kW
2000 kW
2500 kW
2500 kW
2500 kW
2500 kW
2500 kW
2500 kW
2500 kW
2500 kW
2500 kW
2500 kW
2500 kW
2500 kW
2500 kW
2500 kW
Explanation of model designation
WKG 40 / 1, version ZMH
Index No. Preheated air version
for capacity Mode of operation:
range Sliding two stage
Size
(servomotor with 20 s runtime)
Fuel:
modulating
L = distillate oil EL (servomotor with 42 s run time)
MS = residual oil MS
G = Gas
Weishaupt burner series
9

Model and capacity overview
Type WK70 - standard version
Burner Version Fuel Capacity range
type kW kg/h 0 2000 4000 6000 8000 10000 120000 kW
WKL70/1-B ZM Oil 1200 – 7000 100 – 590
ZMH Oil 1200 – 5600 100 – 472
WKMS70/1-B ZM Oil 1800 – 7000 160 – 623
ZMH Oil 1800 – 5600 160 – 498
WKG70/1-B ZM N-Gas 1100 – 7000
ZMH N-Gas 1100 – 5600
WKGL70/1-B ZM Oil 1200 – 7000 100 – 590
ZMH Oil 1200 – 5600 100 – 472
ZM N-Gas 1100 – 7000
ZMH N-Gas 1100 – 5600
WKGMS70/1-BZM Oil 1800 – 7000 160 – 623
ZMH Oil 1800 – 5600 160 – 498
ZM N-Gas 1100 – 7000
ZMH N-Gas 1100 – 5600
WKL70/2-A ZM Oil 1800 –12000 150 –1012
ZMH Oil 1800 – 9600 150 – 810
WKMS70/2-A ZM Oil 2150 –12000 190 –1068
ZMH Oil 2150 – 9600 190 – 854
WKG70/2-A ZM N-Gas 1400 –12000
ZMH N-Gas 1400 – 9600
WKGL70/2-A ZM Oil 1800 –12000 150 –1012
ZMH Oil 1800 – 9600 150 – 810
ZM N-Gas 1400 –12000
ZMH N-Gas 1400 – 9600
WKGMS70/2-AZM Oil 2150 –12000 190 –1068
ZMH Oil 2150 – 9600 190 – 854
ZM N-Gas 1400 –12000
ZMH N-Gas 1400 – 9600
4000 kW
4000 kW
4000 kW
4000 kW
4000 kW
4000 kW
4000 kW
4000 kW
4000 kW
4000 kW
4000 kW
4000 kW
4000 kW
4000 kW
5000 kW
5000 kW
5000 kW
5000 kW
5000 kW
5000 kW
5000 kW
5000 kW
5000 kW
5000 kW
5000 kW
5000 kW
5000 kW
5000 kW
20°C combustion air temperature
250°C combustion air temperature
The full-tone and half-tone areas together show the total ratings
range. When sizing burners ensure that the required nominal rating
lies within one of the full-tone areas.
The capacity ranges are based on an installation altitude of 500 m
above sea level.
N-Gas = Natural Gas E/LL
LPG = Liquid Petroleum Gas B/P
10

Model and capacity overview
Type WK50 - NR version
Type WK70 - NR version
Burner Version Fuel Capacity range
type kW kg/h 0 1000 2000 3000 4000 5000 6000 kW
WKG50/1 ZM-NR N-Gas, LPG 600 – 4000
ZMH-NR N-Gas, LPG 600 – 3200
WKGL50/1 ZM-NR Oil 712 – 4000 60 – 337
ZMH-NR Oil 712 – 3200 60 – 270
ZM-NR N-Gas, LPG 600 – 4000
ZMH-NR N-Gas, LPG 600 – 3200
WKG50/2 ZM-NR N-Gas, LPG 800/950 – 6000
ZMH-NR N-Gas, LPG 800/950 – 5000
WKGL50/2 ZM-NR Oil 1125 – 6000 95 – 506
ZMH-NR Oil 1125 – 5000 95 – 420
ZM-NR N-Gas, LPG 800/950 – 6000
ZMH-NR N-Gas, LPG 800/950 – 5000
2000 kW
2000 kW
2000 kW
2000 kW
2000 kW
2000 kW
2500 kW
2500 kW
2500 kW
2500 kW
2500 kW
2500 kW
Burner Version Fuel Capacity range
type kW kg/h 0 2000 4000 6000 8000 10000 120000 kW
WKG70/1 ZM-NR N-Gas, LPG 1400 – 12000
7000 kW
ZMH-NR N-Gas, LPG 1400 – 9600
5000 kW
WKGL70/1-B ZM-NR Oil 1200 – 7000 100 – 590
ZM-NR Oil 1200 – 5600 100 – 472
4000 kW
4000 kW
ZM-NR N-Gas, LPG 1100 – 7000
ZMH-NR N-Gas, LPG 1100 – 5600
4000 kW
4000 kW
WKG70/2 ZM-NR N-Gas 1400 – 12000
LPG 2000 – 12000
ZMH-NR N-Gas 1400 – 9600
LPG 2000 – 9600
WKG70/2-A ZM-NR Oil 1800 – 12000 150 – 1012
ZMH-NR Oil 1800 – 9600 150 – 810
ZM-NR N-Gas 1400 – 12000
LPG 2000 – 12000
5000 kW
5000 kW
5000 kW
5000 kW
5000 kW
5000 kW
5000 kW
5000 kW
Explanation of model designation
WKG 40 / 1, version ZMH
Index No. for Preheated air version
capacity Mode of operation:
range Sliding two stage
Size
(servomotor with 20 s runtime)
Fuel:
modulating
L = distillate oil EL (servomotor with 42 s run time)
MS = residual oil MS
G = Gas
Weishaupt burner series
11

Model and capacity overview
Type WK50 - version 1LN
Type WK70 - versions LN/1LN
Weishaupt Corporation
6280 Danville Road
Mississauga, ON L5T 2H7
Ph: (905) 564 0946, Fax: (905) 564 0949
www.weishaupt-corp.com
Print No. 83006816, November 2000
Printed in Germany. All rights reserved.
Burner Version Fuel Capacity range
type kW kg/h 0 1000 2000 3000 4000 5000 6000 kW
WKG50/1 ZM-1LN N-Gas, LPG 600 – 3600
ZMH-1LN N-Gas, LPG 600 – 3000
WKGL50/1 ZM-1LN Oil 800 – 3600 67 – 302
ZMH-1LN Oil 800 – 3000 67 – 252
ZM-1LN N-Gas, LPG 600 – 3600
ZMH-1LN N-Gas, LPG 600 – 3000
WKG50/2 ZM-1LN N-Gas, LPG 800/950 – 5500
ZMH-1LN N-Gas, LPG 800/950 – 4800
WKGL50/2 ZM-1LN Oil 1125 – 5500 95 – 462
ZMH-1LN Oil 1125 – 4800 95 – 403
ZM-1LN N-Gas, LPG 800/950 – 5500
ZMH-1LN N-Gas, LPG 800/950 – 4800
2000 kW
2000 kW
2000 kW
2000 kW
2000 kW
2000 kW
2500 kW
2500 kW
2500 kW
2500 kW
2500 kW
2500 kW
Burner Version Fuel Capacity range
type kW kg/h 0 2000 4000 6000 8000 10000 120000 kW
WKG70/1-B ZM-LN N-Gas 1200 – 7000
ZMH-LN N-Gas 1200 – 5600
3000 kW
3000 kW
WKG70/2-A ZM-LN N-Gas 1750 – 11000
ZMH-LN N-Gas 1750 – 8800
WKG70/2 ZM-1LN N-Gas 1100–12000
ZMH-1LN N-Gas 1100– 9600
ZM-1LN LPG 1400–12000
ZMH-1LN LPG 1400– 9600
WKGL70/2 ZM-1LN Oil 1900–12000 160–1012
ZMH-1LN Oil 1900– 9600 160– 810
ZM-1LN N-Gas 1100–12000
LPG 1400–12000
ZMH-1LN N-Gas 1100– 9600
LPG 1400– 9600
5000 kW
5000 kW
5000 kW
5000 kW
5000 kW
5000 kW
5000 kW
5000 kW
5000 kW
5000 kW
5000 kW
5000 kW
20°C combustion air temperature
250°C combustion air temperature
The full-tone and half-tone areas together show the total ratings
range. When sizing burners ensure that the required nominal rating
lies within one of the full-tone areas.
The capacity ranges are based on an installation altitude of 500 m
above sea level.
N-Gas = Natural Gas E/LL
LPG = Liquid Petroleum Gas B/P