Bentone BG 450 LN Technical specifications

Providing sustainable energy solutions worldwide
178 139 76-3 P93783 2023-02-23
Installation- and maintenance instruction
BG 450 LN
LME22.233C2
MB-VEF 412
Translation of the original instructions.

2Bentone
example Beispielexempel
352011030141
Designation
Type
Model
Serial no.
Motor supply
Main supply
MADE IN SWEDEN BY
LIGHT OIL 35-90kW 1,25-6,0 cSt 7-14bar
BF 1 KS 76-24
BF 1
BF 1 KS 76-24
1234567
1~230V 1,0A 50Hz IP 20
Man.Year 2019
Cap. Min-Max
3
?
1
-sv
1. Manualer på övriga språk
2. www.bentone.com\
nedladdning eller scanna
QR-koden.
3. Skriv in brännarens
artikelnummer som  nns på
din typskylt (se bild) och välj
ditt språk.
Detaljerad ecodesign
information kan laddas ner
på: www.bentone.com/
ecodesign.
-en
1. Manuals in other languages
2. www.bentone.com\
download or scan QR-code.
3. Enter the burner`s article
number on your data plate
(see picture) and select
language.
Detailed ecodesign
information can be
downloaded at:
www.bentone.com/
ecodesign.
-da
1. Manualer på andre sprog
2. www.bentone.com\
download eller scan
QR-koden.
3. Indtast brænderens
artikelnummer, der  ndes
på typeskiltet (se billede), og
vælg dit sprog.
Detaljerede oplysninger om
ecodesign kan downloades
på: www.bentone.com/
ecodesign.
-fr
1. Manuels dans d’autres
langues
2. www.bentone.com\
download ou scannez le
code QR.
3. Saisir le numéro d’article
du brûleur sur votre plaque
signalétique (consultez
l’illustration) et sélectionnez
la langue.
Des informations détaillées
sur l’écodesign peuvent être
téléchargées à l’adresse:
www.bentone.com/
ecodesign.
-de
1. Gebrauchsanweisungen in
anderen Sprachen
2. www.bentone.com\
download oder scannen Sie
den QR-Code.
3. Geben Sie die
Artikelnummer des Brenners
auf Ihrem Typenschild ein,
(siehe Bild) und wählen Sie
die Sprache aus.
Detaillierte Informationen
zum Ecodesign können unter
www.bentone.com/ecodesign
heruntergeladen werden.
2

3Bentone
Table of contents
1. General Information............................................................4
1.1 Delivery inspection........................................................................ 4
1.2 Safety ............................................................................................... 4
1.3 What to do if you smell gas......................................................... 5
2. Technical data.......................................................................6
2.1 Dimensions BG 450 LN................................................................ 6
2.2 Capacity range............................................................................... 6
2.3 Gas categories, approved gases................................................ 7
2.4 Technicalspecication ................................................................. 7
2.5 Workingeld.................................................................................. 7
2.6 Components................................................................................... 8
2.7 Skeleton diagrams ....................................................................... 9
3. Electric equipment.............................................................10
3.1 Safety system .............................................................................. 10
3.2 Wiring diagram............................................................................ 10
3.3 Function LME ............................................................................... 11
3.4 Control program at faults; fault mode indicator LME .... .... 12
4. Installation..........................................................................14
4.1 General instructions................................................................... 14
4.2 Instructions .................................................................................. 14
4.3 Inspection and maintenance.................................................... 14
4.4 Preparation for assembly ......................................................... 14
4.5 Gas supply .................................................................................... 14
4.6 Electric connection ..................................................................... 14
4.7 Handling and lifting instruction ............................................... 15
5. Mounting ............................................................................16
5.1 Gas nozzle..................................................................................... 17
5.2 De-aerating................................................................................... 18
5.3 Leakage control........................................................................... 18
5.4 Calculationofgasow.............................................................. 19
6. Settings ...............................................................................20
6.1 Setting the combustion assembly........................................... 20
6.2 Startup........................................................................................... 20
6.3 Control of combustion .............................................................. 20
6.4 Settingtheairpressureswitch ................................................ 21
6.5 Settingthegaspressureswitch,min...................................... 22
6.6 Setting Damper motor, Modulating operation .................... 23
7. Gas valve, MultiBloc MB-VEF 407-412..............................24
8. Service .................................................................................27
8.1 Burner Service Schedule, Gas .................................................. 27
8.2 Component replacement intervals.......................................... 27
8.3 Combustion device ..................................................................... 28
8.4 Air damper.................................................................................... 29
8.5 Replacement, Damper motor air............................................. 30
8.6 Fan ................................................................................................. 31
8.7 Vibrations...................................................................................... 32
8.8 Controlofamemonitoringandionizationcurrent ........... 33
8.9 Replacement of electrical components.................................. 35
9. Handing over of the installation ......................................36
10. Troubleshooting.................................................................37
11. Service- and inspection protocol .....................................39

4Bentone
172 515 01-2 2021-10-05
1. General Information
The burner may only be used for its intended purpose in accordance with the
product’s technical data.
We reserve the right to make design changes and cannot be held liable for any
misprints or typographical errors.
Modifying the design or using accessories or components that have not been
approved by Enertech in writing is strictly prohibited.
This Installation and Maintenance manual:
• is to be regarded as part of the burner and must always be kept near
the installation site.
• must be read prior to installation.
• is intended for use by authorised personnel.
1.1 Delivery inspection
• Make sure everything is delivered and the goods have not been
damaged during transit. Transport damage should be reported to the
shipping company.
• If something is wrong with a delivery, report it to the supplier.
1.2 Safety
- before installation:
• Installation and work on the burner and associated system
components may only be carried out by persons who have undergone
relevant training.
• The product is packaged to prevent damage from occurring when
handled – Handle the product with care! Lifting equipment must be
used to lift larger packages.
• The products must be transported/stored on a level surface in a dry
environment, max. 80% relative humidity, no condensation.
Temperature -20 to +60 °C.
- installation:
• The burner must be installed in accordance with local regulations for
 re safety, electrical safety, and fuel distribution.
• The premises must comply with local regulations pertaining to use of
the burner and must have adequate air supply.
• The installation site must be free of chemicals.
• Fire extinguisher with Class BE recommended.
• Make sure when installing the burner that there is enough space to
service the burner.
• The electrical installation must be professionally carried out in
accordance with current mains electricity regulations and in a
professional manner.
• Make sure that the burner is suitable for the application (see Technical
Data).
• All components must be installed without being bent, twisted or
subjected to mechanical or thermal forces that affect components.

5Bentone
• Care must be taken by the installer to ensure that no electrical cables
or fuel lines are pinched or otherwise damaged during installation or
service.
• Sharp edges can occur on, for example:  ame tube, fan wheel and air
damper.
• The gas outlet from the pressure regulator must be con gured in
accordance with applicable regulations and lead to a safe area.
- before  rst start:
• The burner must not be put into operation without proper safety and
protection devices.
• Permitted ambient temperature during operation -10 to +60 °C. Max.
80% relative humidity, no condensation.
• The surface temperature of the burner’s components may exceed
60 °C.
• Handle with caution – the burner has moving parts, and there is risk
of crushing injuries.
• Seal inspections must be performed during installation and servicing
to prevent leakage.
• Fitting and installation work has been completed and approved.
• Electrical installation has been correctly performed.
• Flue gas ducts and combustion air ducts are not blocked.
• All actuators and control and safety devices are in working order and
correctly set.
• If the boiler is equipped with an access hatch, this must be equipped
with a hatch opening switch connected to the burner’s safety system.
• When in operation, the burner’s noise level can exceed 85 dBA – use
hearing protection!
- Operation:
• Carry out all stipulated settings, service and inspection work within
the set time.
1.3 What to do if you smell gas
• Turn off the fuel supply.
• Turn off the device and remove the boiler from operation.
• Open windows and doors.
• Prevent open  ames or sparking, e.g. do not turn lights on or off, do
not use any electrical appliances or mobile phones.
• Evacuate the building.
• Notify the installer or gas supplier of the problem so that it can be
recti ed.

6Bentone
2. Technical data
The burner is intended for:
• Operation in installations according to EN 303 and EN 676.
Fuels:
• Natural gas H, E, L, LL.
• LPG, Butane and Propane.
2.1 Dimensions BG 450 LN
172 515 54-3 2023-02-20
Length of
ame tube
Flame tube
measure A
Flame tube
measure B
Flame tube
measure C
252 222 ø162 ø162
* The above dimensions are max. measurements. Depending on the components used, the measurements may vary.
** Min. recommended distance to oor.
K
L
M
BG 450 LN
G20 90 - 449 9.5 47.5 360
G25 90 - 381 11.1 46.9 360
160302-300-2
Capacity
kW
Gas quantity
at min. power
Nm3/h
Gas quantity
at max. power
Nm3/h
Max.
connection
pressure mbar
Min
connection
pressure mbar
See data plate.
Gas quantity and capacity vary according to grade of gas and connection pressure.
2.1.1 Measurements for connection to the boiler
2.2 Capacity range
I
øC
AG
E
D
øB
F
**J
160303-678
H
K L M
10 (Ø 210) Ø 254-280 Ø 145
D E *F G H *I **J
538 252 328 *500 *640 262 200

7Bentone
2.3 Gas categories, approved gases
Only dry gas is permitted for use.
!Do not exceed working
eld.
2.5 Working eld
2.4 Technical specication
Measurements according to EN 15036-1:2006
Alt.1 The noise level of the burner can be reduced by equipping the burner with
silencer. Installation must be done so it does not prevent air supply to the
burner.
Alt.2 The burner’s noise level can be reduced by connecting the burner’s air
intake to the air duct that opens into an appropriate location. Installation
must be done so it does not prevent air supply to the burner.
Category Country of destination Supply pressure
I2R AT, BE, BG, CH, CY, CZ, DE, DK, EE, ES, FI, FR, GB, GR,
HR, HU, IE, IS, IT, LT, LU, LV, MK, MT, NL, NO, PL, PT, RO,
RS, SE, SI, SK, TR
30 mbar
I2ELL DE 30 mbar
I2H AT, BG, CH, CZ, DK, EE, ES, FI, GB, GR, HU, IE, IS, IT, LT,
LV, NO, PT, RO, SE, SI, SK, TR 30 mbar
I2Er FR 30 mbar
I2E LU, PL 30 mbar
I2E(R)B BE 30 mbar
I2L NL 30 mbar
160303-290-2
BG 450 LN
Main supply 230V, 1~, 4.6A, 50Hz, IP20
Max fuse rating 10A
Elmin 2.12A, 434W
Elmax 2.51A, 538W
PSB 0
NOX-class 5
NOX (GCV) 52mg/kWh
Noise level 79dBA
-1
0
1
2
3
4
5
6
7
8
9
50 100 150 200 250 300 350 400 450 500
mbar
kW
G20 90-449 kW
G25 90-381 kW
160303-351

8Bentone
2.6 Components
1. Flame tube
2. Brake plate
3. Nozzle
4. Inner assembly
5. Fixing  ange
6. Transformer
7. Control box
8. Contactor
9. Gas pressure switch, max
10. Connection, gas
11. Cover, inspection glass
12. Electrical connection
13. Fan wheel
14. Motor
15. Reset button
16. Damper motor
17. Switch 0-I
18. Indication lamp, operation
19. Changeover switch, man-auto
20. Changeover switch, increase-
decrease
21. Air pressure switch
22. Ball valve
23. Air damper
24. Gas pressure switch, min
25. Air intake
26. Gas valve (MultiBloc)
27. Impulse line PL
28. Impulse line PF
29. Ignition electrode
30. Ionization electrode
15
19
20
16
21 22 262423 25
28
27
160303-680
18
17
29 30
160303-682
1 3 4
11
13
5
160303-679
2 6 7 8
14
10
12
9

9Bentone
172 515 05 2018-01-02
2.7 Skeleton diagrams
1. Ball valve
2. Filter
3. Governor
4. Pressure gauge with shut-off cock
5a. Gas pressure switch, min
5b. Gas pressure switch, max
6a. Main valve, 2 -stage. In modulaing operation, this valve is equipped
with controls for variable opening.
6b. Safety valve
7. 1) Valve proving system
9. Air pressure switch
10. Gas burner control
Pos. 5b, 7: Components not required according to EN 676.
1) Required over 1200 kW according to EN 676.
Gas valve (MultiBloc)

10 Bentone
E105861
3. Electric equipment
3.1 Safety system
The safety system (safety switch for hatches, doors, water level, pressure,
temperature and other safety devices) must be installed in the safety circuit in
accordance with current regulations for the system.
The cables of the safety system must be separated so that the outgoing signal
is not placed in the same cable as the incoming signal.
3.2 Wiring diagram
172 615 32-3
Bn Brown
Bu Blue
Gn Green
Ye Yellow
Gn/Ye Green/Yellow
Bk Black
Gy Grey
Rd Red
Wh White
Og Orange
Vt Violet

11Bentone
3.2.1 Components
A1 Gas burner control
A2 Power control
B1 Ionization electrode
F1 Operating fuse
H1 Operating lamp
H3 Alarm signal 230V
K1 Contactor
M1 Motor
M2 Damper motor
P1 Time counter,
total operating time
Q1 Signal amplier AGQ (accessory)
R1 UV-detector (accessory)
S1 Operating switch
S3 Control thermostat
S4 Temperature limiter
S5 Safety switch for hinged door
S7 Main switch
S8 Air pressure switch
S9 Gas pressure switch, min
S11 Change-over switch, Man-Auto
S12 Change-over switch, Increase-
Decrease
S15 Control thermostat, 3-pole (only
for 2-stage sliding)
T1 Ignition transformer
X1 Connection terminal board
X2 Earth terminal
X3 Plug-in contact, burner
X4 Plug-in contact, boiler
X15 Plug-in contact, power
controller, burner
X16 Plug-in contact, power controller
Y1 Solenoid valve 1
Y3 Solenoid valve 3
!Mains connection and
fuse in accordance with
local regulations.
3.2.2 Technical data
LME22.232C2E
3 s
20 s
2.5 s
< 3 s
< 1 s
< 1 s
5 µA
20 µA
160303-325
Preiginition time
Prepurge time
Postignition time
Safety lockout time
Reset time after lockout
Reaction time on  ame failure
Min. ionisation current at  ame
Max. ionisation current
3.3 Function LME
1. Operating switch ON-Thermostat ON-Gas pressure switch ON-Air
damper closed.
Check that the air pressure switch does not indicate fan pressure,
then the motor starts.
2. Damper motor opens.
The damper motor opens the damper to the maximum load position.
Check that the air pressure switch indicates sucient fan pressure.
3. Damper motor closes.
The damper motor closes to the minimum load position, then the
ignition spark is produced.
4. Main and safety valves open.
The gas ignites and the ionisation electrode indicates ame.
5. The safety time ends.
Ignition spark and safety time cease. If the spark is missing or it
disappears after this time limit, the gas burner control is blocked.
6. Operating position.
The burner is in operating mode and can now switch to the capacity
controlled by the controller.
7. Stop.
The burner operation can be stopped with the operating switch or the
thermostat.
If the gas burner control is blocked
The red light in the gas burner control comes on. The burner is restarted by
pressing the reset button.

12 Bentone
Light period
(waiting period ≥ 10 s)
Blinking
code Pause Blinking code
Press the reset
button > 3 s
3.4 Control program at faults; fault mode
indicator LME ....
3.4.1 Colour codes
3.4.2 Diagnosting alarm causes
After alarm disconnection, the red alarm signal light is lit continuously.
The diagnosing of the alarm cause can be read according to the following
sequence:
3.4.3 Limiting of starting repetitions
LME 11... has a function with start repetition if the ame is not created at start
or disappears during operation.. LME 11... allows max. three repetitions during
continuous starting cycle.
Table colour codes for multi-coloured signal light (LED)
Status Colour codes Colours
Waiting period «tw», other waiting periods ○………………… O
Ignition phase, ignition controlled ●○●○●○●○●○● Blinking yellow
Normal operation □………………… Green
Operation, poor ame signal □○□○□○□○□○ Blinking green
Illegal ame signal during start-up □▲□▲□▲□▲□▲ Green-Red
Undervoltage ●▲●▲●▲●▲●▲ Yellow-Red
Fault, alarm ▲………………… Red
Blinking code for fault codes ▲○ ▲○ ▲○ ▲○ Blinking red
Interface diagnostics ▲▲▲▲▲▲▲▲ Red icking
…… Continuous
○Off
▲Red
●Yellow
□Green

13Bentone
During the diagnosing of the alarm cause, the control outputs are voltage-
free.
• The burner is disconnected.
• Exception, alarm signal «AL» at board 10.
• Reconnection of the burner happens after resetting only.
• Press the reset button 0.5...3 s.
3.4.4 Interface diagnostics
To change to interface mode, press and hold the reset button longer than 3 s.
To go back to the normal position, press and hold the reset button longer than
3 s. If the gas burner control is in the alarm position, it is reset by pressing the
reset button 0.5...3 s.
3.4.5 Alarm code table
Red blinking code on
signal lamp (LED)
Possible causes
Blinking 2 x
••
No ame creation at End of “TSA”
–defective or fouled ame monitoring.
–defective or fouled fuel valves.
–poor burner setting.
–defective ring device.
Blinking 3 x
•••
“LP” defective
–No air pressure switch signal after “t10”.
–“LP” is welded in open position.
Blinking 4 x
••••
Illegal ame signal during start-up.
Blinking 5 x
•••••
Time out “LP”
–“LP” is welded in open position.
Blinking 6 x
••••••
Free
Blinking 7 x
•••••••
Too many ame disappearances during operation.
–poor burner setting.
–defective or fouled fuel valves.
–defective or fouled ame monitoring.
Blinking 8 x
••••••••
Free
Blinking 9 x
•••••••••
Free
Blinking 10 x
••••••••••
Connection fault or internal fault, outgoing contacts or
other faults.
Blinking 14 x
••••••••••••••
CPI contact not closed.

14 Bentone
172 535 09-2
4. Installation
4.1 General instructions
Installation must be carried out in accordance with current regulations and
instructions.
The supplier/installer of the facility is obliged to familiarize himself with
all regulations so that the installation meets the requirements of the local
authorities.
Installation, assembly and settings must be performed to obtain the best
possible function. Only gas intended for the gas burner may be used.
4.2 Instructions
It is the installer’s responsibility to instruct the user in detail in the functions of
the gas burner and the entire system.
4.3 Inspection and maintenance
The system must be maintained at the interval specied in the service
schedule. If the burner is in a dirty environment, service should be done at
more frequent intervals.
4.4 Preparation for assembly
Check that the burner’s dimensions and capacity range match the current
boiler. The power information on the type plate refers to the burner model’s
min. and max. effect.
4.5 Gas supply
In order to obtain good operational safety, it is important that the installation
of the gas distribution system is carried out correctly, considering the
following:
• Check that the burner is approved for the gas quality of the
installation.
• Check that the burner gas components are approved for the specied
gas pressure, see type plate.
• Installation must be carried out in accordance with current standards.
• Pipe lines should be assembled so that service can easily be
performed on the boiler and burner.
• Pipe lines should be assembled so that any contaminants do not come
into contact with the gas components.
4.6 Electric connection
• Before work on the electrical connection, the current must be
disconnected so that the installation is isolated.
• Connection must be done in accordance with the applicable
regulations.
• Connection must conform to the wiring diagram.
!If any electrical connection other than that recommended
by Enertech is used, there is a risk of property damage and
personal injury.

15Bentone
172 515 29 2018-02-21
4.7 Handling and lifting instruction
iThe lifting aid are available as
accessories.

16 Bentone
172 515 55-2 2023-02-21
5. Mounting
Mount the  xing  ange with  ame tube, nozzle assembly and gas  tting on the
boiler. If new  xing holes need to be drilled, use the  xing  ange as a template
and install with M8-M10 screws (A).
Separate the  xing  ange from the fan housing as follows:
1. Remove cover of fan housing (A), disconnect ignition and ionizing
cables and the control arm (B) from nozzle assembly.
2. Disconnect the electrical cable to the gas valve.
3. Loosen nuts on both sides of the  xing  ange.
4. Loosen end stop (C) for guides.
5. Pull the  xing  ange with  ame tube, nozzle assembly and gas  tting
out of the fan housing.
6. Check that the ignition electrodes are correctly set, see chapter Gas
nozzle.
7. Fit the enclosed gasket to the  ame tube.
8. Screw the  xing  ange and the enclosed gasket onto the boiler, lift
the fan housing onto the guides and mount in reverse order.
9. Connect the gas line, connect the supply cable, operating and safety
circuits.
!Before obtaining access to electrical and fuel line components
all supply circuits must be disconnected.
B
C
A

17Bentone
5.1 Gas nozzle
Check that the ignition and ionisation electrodes are correctly set before
mounting on the boiler.
A B
A
B
A = 10 mm - Front edge Brake plate
B = 3 mm
A = Position Ionisation electrode
B = Position Ignition electrode

18 Bentone
5.2 De-aerating
De-aerating the gas line by closing the tap to the gas connection and
unscrewing the screw on the measuring nipple for the connection pressure.
Connect a plastic hose, open the tap and drain the gas in a safe place. When
the de-aerating is completed, be sure to ret the screw on the measuring
nipple.
5.3 Leakage control
When checking for leakage, the solenoid valve must be closed. A pressure
gauge is connected to the measuring nipple ”Pa”, see picture. The test
pressure in the system must not be higher than max. connection pressure,
see data plate. If leaks are found during measurement, locate the source
using soapy water or leak detection spray. After sealing: check the leakage of
the gas xture again.
!Check for leaks in the gas line.
Pa

19Bentone
5.4 Calculation of gas ow
Formula symbol Description Example values
VNStandard gas volume [Nm3/h]
Gas volume at normal condition 15 °C 1013 mbar
-
QBoiler output [kW] 380 kW
HiLower caloric value of gas [kWh/m3]
Natural gas under normal conditions 15 °C 1013 mbar, EN 676
9.45 kWh/m3
ηBoiler eciency (e. g. 90%) 0.9
f Conversion factor (pressure and temperature compensation) -
tGas Gas temperature at gas meter [°C] 15 °C
PBaro Barometric air pressure [mbar] 945 mbar
PGas Pressure of gas at the gas meter [mbar] 20 mbar
VOperating volume [m3/h] -
VG Gas ow measured at the gas meter [m3] 1.28 m3
TMeasuring time for consumed gas quantity [s] 93 s
VN=
Q
VN =
380 kW
=44.7 m3/h
η · Hi0.9 · 9.45 kW/m3
Calculate standard volume using the following formula:
f=
273
x
PBaro + PGas
f=
273
·
945 + 20
= 0.90
273 + tGas 1013 273 + 15 1013
Calculate conversion factor using the following formula:
V=VNV=
44.7 m3/h =49.5 m3/h
f0.90
Calculate gas volume using the following formula:
V=
3600 · VGV= 3600 · 1.28 m3
=49.5 m3/h
T93 sek
Determine operating volume with the following formula:
Gas quality kWh/Nm3MJ/Nm3
Natural gas G20 9.5 34.02
Natural gas G25 8.2 29.25
Caloric value of the gas
Lower caloric value Hi at normal conditions 15 °C and 1013 mbar, EN 676.
For exact caloric value of the gas, contact the gas distributor.
172 535 72
Height above
sea level [m] 0 100 200 300 400 500 600 700 800 900 1000 1100 1200
PBaro [mbar] 1013 1001 989 977 966 954 943 932 921 910 899 888 877
Gas quality kWh/Nm3MJ/Nm3
Butan G30 32.25 116.09
Propan G31 24.44 88.00
Biogas 6.0 21.60

20 Bentone
172 515 32-2 2022-09-28
X
6. Settings
6.1 Setting the combustion assembly
The burner is equipped with a lever that changes the position of the brake
plate in the combustion head. This is used to set the correct pressure
drop across the combustion assembly and thereby obtain good
combustion without ripples.
Make the adjustment by turning screw X.
The best position is, among other things, dependent on the input
power and overpressure in the boiler.
A general rule of thumb is that the smaller the capacity, the smaller
the gap should be between the brake plate and the combustion
assembly.
The position of the brake plate also has an impact on the quantity of air
supplied for combustion. This means that once the brake plate has been
adjusted, the combustion should be checked and, if necessary, the setting of
the air damper adjusted to obtain good combustion.
A left turn opens the brake plate, providing a lower pressure drop and more air
to the combustion process.
A right turn closes the brake plate, providing a higher pressure drop and less
air to the combustion process.
Gas quality Excess air  ue gases Max % CO2
% O2% CO2 Lambda 1.2
Natural gas 3 - 5 ≈10 11.9
Propane 3 - 5 ≈11.5 13.9
Butane 3 - 5 ≈11.5 14.1
Lique ed
petroleum gas 3 - 5 ≈11 13.8
Biogas 3 - 5
6.2 Startup
After the burner has been mounted on the boiler and the electrical connection,
de-aeration and tightness control have been performed, the burner is ready to
start-up.
Read the sections dealing with settings of gas valve, damper motor and
combustion device before start-up.
Open the ball valve and turn on the main switch, start the burner and begin
setting up the system.
6.3 Control of combustion
Check combustion using  ue gas analysis instruments. Set the burner to about
20% excess air and check that good combustion is obtained. Check the actual
gas  ow on the gas meter to ensure that the correct input power is achieved.
Recommended air excess at basic setting
Setting the air pressure switch
The air pressure switch must block the burner if the amount of air for
combustion becomes too low. The air pressure switch must be set so that in
the event of a lack of air supply at the burner’s max. or min. capacity reacts
before the monitored pressure drops so much that poor combustion occurs.
1. Remove protective cover.
Carefully turn the scale on the air pressure switch clockwise until the
air pressure switch stops the burner.
4. Measure and note the lowest air pressure in the entire work area.
5. Set the air pressure switch to about 10-15% lower than the lowest
noted pressure.
6.
7. Re t protective cover.
172 535 11-2