Bentone BG 450 M User manual

178 016 76
Installation- and maintenance instruction
BG450M

DESCRIPTION
Warning – Read the manual before assembling or commissioning.
– The contents of this manual are to be observed by all who work for any
reason on the unit and its appertaining system parts.
– This manual is intended especially for authorised personnel.
– This manual is to be regarded as part of the burner and shall always be
available near the place of installation.
– The burner is only to be installed by qualied personnel
– Check that the burner is suitable for the boiler´s power range.
– The burner is to be installed such that it complies with any local
regulations relating to electrical safety, boilers and fuel distribution.
– Check that the burner is approved for the gas quality intended used.
– No burner safety systems are to be disengaged.
– The tter is to ensure that the boiler room is supplied with fresh air
ventilation that is sufcient in accordance with local standards.
– Before servicing, shut off the fuel supply and the power supply to the
burner.
– The outer temperature of the boiler´s components can exceed 60 °C.
– Check that the guide stop is installed before servicing.
– Take great care when servicing. Trap and pinch risks can be present.
– The boiler´s sound level can exceed 85 dBA during operation. Use ear
protectors when present in the boiler room
Safety directions – The electrical installation shall be made according to valid regulations
for heavy current and in a professional way, so that the risk of leaking
gas, re or personal injury is avoided.
– If another electrical connection is used than the one recommended by
Enertech, there might be a risk of material damage or personal injury.
– Notice should be carefully taken by the installer that no electrical cables
or gas pipes get squeezed or damaged when installing or at service
– If the boiler is provided with an opening door, this should be interlocked
with a door switch.
Acceptance inspection – Ensure that everything is delivered and that there is no transport
damage.
– If there is anything wrong with the delivery, please report it to the
supplier.
– Any transport damage should be reported to the forwarding company.
Preparations for installation – Ensure that the size and capacity range of the burner are suitable for
the boiler.
– Power data on the data plate refer to the minimum and maximum power
of the burner.
172 155 15 08-01
Warning
!

172 205 92 08-01
DESCRIPTION
Components
1. Flame cone
2. Inner assembly
3. Fixing ange
4. Electric panel
5. Fan wheel
6. Fan house
7. Shrouded disc
8. Ignition electrode
9. Ionisation electrode
10. Motor
18. Switch l-ll
(For modulating burner:
Change-over switch manually-
automatically)
19. Indicating lamp Stage 1
20. Switch 0-1
21. Contactor
22. Control box
23. Ignition transformer
24. MultiBloc
11. Connection gas ttings
12. Air intake
13. Air damper
14. Air pressure switch
15. Conical shield plate
16. Fuse
17. Indicating lamp Stage 2
(For modulating burner: Change-
over switch increase-decrease)

640
262 A 538
252
ø160
ø130
500
328
252
Armatur 2) Motor Ignition transformer
Natural gas LPG 1-fas, 450W, 2 800 r/m, Primary 230 V, 1A
1
1/2"230/240 V Secondary 8 000 V
2) Town gas
CAPACITY CHART ACCORDING TO
EN 676
Type Capacity Gas volume at a min.Gas volume at a max Max. inlet Rated inlet pressure
kW output Nm3/h 1) output Nm3/h 1) pressure mbar mbar
Natural gas/LPG Natural gas LPG Natural gas LPG Natural gas LPG
450 120-550 12 4,6 55 21 360 40 30-50
2) Town gas 2) Town gas 2) Town gas 2) Town gas
Out range
TECHNICAL DATA
Type designation BG 450
Dimensions
1) Caloric value:
Natural gas 10 kWh/Nm3
LPG 26 kWh/Nm3m3
2) Dimension and capacity depen-
dingongasqualityandavailable
inlet pressure
Length of burner Flange
tube Measure A
Standard 256 226
Long design 356 326
Theabovedimensionsaremax.measurements.Dependingonthecomponents
used, the measurements may vary.
172 215 50 08-01

TECHNICAL DATA
DIMENSIONS OF FLANGE
172 215 19 08-01

SKELETON DIAGRAMS
1. Ball valve
2. Filter
3. Governor
4. Pressure gauge with shut-off
cock
5 a. Gas pressure switch, mini
5 b. Gas pressure switch, maxi
6 a. When modulating operation is
required this valve is equipped
with controls for variable
opening.
6 b. Safety valve
1)7.Valve proving system
8. Air damper motor
9. Air pressure switch
10.Gas burner control Pos.
5b, 7: Components not required
according to EN 676.
1) Requiredover1200kWaccording
to EN 676.
172 415 09 08-01
When Bio gas is used, Bentone shall always be contacted.
!
7
123
4
6b 6a
10 8
5b
5a
9

MOUNTING OF THE BURNER
172 205 20 08-01
Fit the burner to the boiler by means
of 4 bolts M12. For ange and bolt
dimensions see technical data.
If for some reason you want to sepa-
rate the burner from the gas ange
with burner head and valve package
you can do so.
Do like this:
- Remove the cover of the fan hou-
sing.
- Loosen the nut D of the gas
assembly package.
- Loosen the electric cables to the
valve package.
- Loosen the screws B on both
sides.
- Loosen the stop bolt C on the pull
rods.
- Loosen the ignition cable and the
ionisation cable from the gas ass-
embly.
- Pull out the burner on the pull rods
and put it in a suitable place.
When the burner head and the gas
ange have been tted to the boiler it
is easy to lift up the burner to where
it belongs.
Inspection of gas assembly
If the gas assembly needs to be
inspected the pull rods are very
useful.
Do like this:
- Remove the cover of the fan hous-
ing.
- Loosen the nut D of the gas
assembly package.
- Loosen ignition cable and ionisation
cable of gas assembly.
- Loosen the screw A on both sides.
- Pull out the burner on the pull rods.
- Loosen the screws B on the gas
ange.
- Withdraw the gas assembly.
Ensure that the O-ring between the
gas assembly and the gas ange will
be in the correct position when the
gas assembly is tted again.
Adjustment of the position of the
shrouded disc in the blast tube
Sometimes it is necessary to adjust
the position of the shrouded disc in
theblasttube.This can be done with
the screw E (can be adjusted when
theburner isin operation).If youturn
the screw to the left the shrouded
discwillmoveforward(+),totheright
it will move backward.
SERVICE POSITION
NOTE!
For maintenance of the brake plate,
nozzles, electrodes etc, when using
a long design of the burner tube, you
havetoremovethenozzleassembly
fromtheconnectingpipeandmove
the assembly backwards in the fan
housing (from the boiler).

1N ~50/60 Hz230 V
172 425 61 08-01
ELECTRIC EQUIPMENT
Gas burner control: LMG22/LME22
Wiring diagram
1(5)
If there is no Plug-in contact (X4,X16) on the boiler, connect to the contact enclosed.

172 425 61 08-01
ELECTRIC EQUIPMENT
Gas burner control: LGB22/LMG22/LME22
2(5)
List of components
A1 Gas burner control
A2 Power control
B1 Ionization electrode
F1 Operating fuse
H1 Operating lamp
H3 Alarm signal 230 V
K1 Contactor
M1 Burner motor
M2 Damper Motor, L&S SQN75.624.A21B
P1 Time meter, total operating time
S1 Operating switch
S3 Control thermostat
S4 Temperature limiter
S5 Micro switch for hinged door
S7 Main switch
S8 Air pressure switch
S9 Gas pressure switch
S11 Change-over switch, Aut.-Man.
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 Gas solenoid valve 1
Y2 Gas solenoid valve 2
Mains connection in accordance with local regulations.
Function
1. Operating switch ON-Thermostat ON-Gas pressure switch ON-Air damper closed.
A control is made that the air pressure switch does not indicate fan pressure. Then the
burner motor starts.
2. Air damper motor opens.
The air damper motor opens the damper to max position. A control is made that the air
pressure switch indicates sufcient fan pressure.
3. Air damper motor closes.
The air damper motor closes to min load position. Then the ignition spark is formed.
4. Main and safety valves open
The gas is ignited. The ionization electrode indicates a ame.
5. The safety time expires.
The ignition spark goes out. The safety time expires. If there is no ame or if for some
reason the ame disappears after this time limit, the burner control locks out.
6. Operating position.
The burner is in operating position and can now change over to the capacity controlled
by the regulator.
7. Stop.
The operation of the burner can now be interrupted by means of the operating switch or
the thermostat.
• The control locks out.
The red lamp in the control is lit. Restart the burner by pressing the reset button.

A1 = LMG
GP
R/W
L N
br bl rt sw
sw rtQ1 = AGQ 2...
QRA
11112 2
172 425 61 08-01
During the time the cause
of the fault is diagnosed,
the control outputs are
deactivated.
–The burner remains shut
down
–Exception: fault status
signal «AL» at terminal 10
The burner is switched on
only after a reset is made.
–Press lockout reset but-
ton for 0.5...3 seconds
ELECTRIC EQUIPMENT
Control diagnosis under fault conditions and lockout indication
Gas burner control: LMG ...
Diagnosis of cause of fault After lockout, the red fault LED is steady on. For reading the cause of fault, refer to
the blink code given in the following table:
Connecting signal amplier
Error code table
Blink code Possible cause
2 x
••
• No establishment of ame at the end of «TSA»
– Fault or soiled detector electrode
– Fault or soiled fuel valves
– Poor adjustment of burner
3 x
•••
• Air pressure monitor does not close
– «LP» faulty
– «LP» incorrectly adjusted
– Fan motor does not run
4 x
••••
• Air pressure monitor does not open or extraneous light on
burner startup
– «LP» faulty
– «LP» incorrectly adjusted
5 x
•••••
• Extraneous light during pre-purging
– Or internal device fault
7 x
•••••••
• Loss of ame during operation
– Poor adjustment of burner
– Faulty or soiled fuel valves
– Short-circuit between detector electrode and ground
8...17 x
••••••••
.................
••••••••••
•••••••
• Free
18 x
••••••••••
••••••••
• Air pressure monitor opens during pre-purging or operation
– «LP» correctly adjusted
– Four times loss of ame during operation (LMG25)
19 x
••••••••••
•••••••••
• Faulty output contact
– Wiring error
– External power supply on output terminal
20 x
••••••••••
••••••••••
• Internal device fault
3(5)
AL
FS
Red LED on LED on (waiting time≥10 s)
Fault
Press lockout reset button
for > 3 s Blink code Off Blink code
Approx.
3 s

172 425 61 08-01
ELECTRIC EQUIPMENT
Control diagnosis under fault conditions and lockout indication
Gas burner control: LME....
Colour codes
Diagnostics alarm trigger The red alarm signal lamp lights continuously after the alarm is disconnected.
Diagnostics for alarm triggers can be read as specied by the following sequence:
Limit on start attempts
LME 11 … limits the number of start attempts if the ame does not ignite on start-up
or goes out during operation. LME 11 … permits a maximum of three start attempts if
the start cycle is uninterrupted.
Continuous
Off Red
Yellow
Green
4(5)
Colour code table for multi-coloured signal lamps (Light diodes)
Status Colour codes Colours
Waiting time «tw», other waiting times ○………………… Off
Ignition phase, ignition checked •○ •○ •○ •○ •○ •Flashing yellow
Normal operation □………………… Green
Operation, poor ame signal □○□○□○□○□○ Flashing green
Prohibited ame signal during start up □▲□▲□▲□▲□▲ Green-Red
Undervoltage ●▲●▲●▲●▲●▲ Yellow-Red
Disruption, alarm ▲………………… Red
Flashing code for fault codes ▲○ ▲○ ▲○ ▲○ Flashing red
Interface diagnostics ▲▲▲▲▲▲▲▲ Red ickering
Light period (waiting time ≥ 10 s)
AL
FS
Flash code Pause Flash code
Approx. 3 s
lights red Press the reset
button > 3 s

172 425 61 08-01
ELECTRIC EQUIPMENT
Control diagnosis under fault conditions and lockout indication
Gas burner control: LME...
During alarm trigger diagnostics, control outputs are to be disconnected from all
power.
– The burner is disconnected
– Exception, the «AL» alarm signal at connection block 10
The burner is only to be reconnected after it is reset
– Press the reset button 0.5...3 s
Interface diagnostics To switch to interface mode, hold the reset button depressed for more than 3 s. To
return to normal mode, hold the reset button depressed for more than 3 s. If the ring
unit is in the alarm mode, it is reset by pressing the reset button 0.5...3 s.
Connecting signal amplier
Alarm control table
Red ashing code
on signal lamp
(LED)
Possible causes
Flashing 2 x
••
No ame at End of «TSA»
– Defective or obscured ame monitor
– Defective or obscured fuel valves
– Poor burner installation
– Defective ignition unit
Flashing 3 x
•••
«LP» defective
– No air monitor signal after «t10»
– «LP» is welded in the open position
Flashing 4 x
••••
Prohibited ame signal during start up
Flashing 5 x
•••••
Time out «LP»
– «LP» is welded in the closed position
Flashing 6 x
••••••
Free
Flashing 7 x
•••••••
Too many loss of ame during operation
– Poor burner installation
– Defective or obscured fuel valves
– Defective or obscured ame monitor
Flashing 8 x
••••••••
Free
Flashing 9 x
••••••••• Free
Flashing 10 x
•••••••••• Connections fault or internal fault,
outgoing contacts or other fault
Flashing 14 x
••••••••••
••••
CPI contact not closed
5(5)
A1 = LME
GP
R/W
L N
br bl rt sw
sw rtQ1 = AGQ 3...
QRA
11112 2

MEASURES AND CHECKS BEFORE START-UP,
General rules
Care should be taken by the installer
to ensure that no electrical cables or
fuel/gaspipesaretrappedordamaged
during installation or service/mainte-
nance.
Inner assembly
Ensurethattheignitionandionisation
electrodes are correctly adjusted. The
sketch shows the correct measure-
ments.
Gas quality
Ensurethattheburnerhead ismeant
for the gas quality to be used (see g.)
Venting
Thegaslineisventedbylooseningthe
screw on the test nipple for the inlet
pressure.Connectaplastichoseand
conduct the gas into the open. After
having vented the gas line tighten
the screw again.
Leakage control
Whenmakingaleakagecontrolofthe
gassupplysystemthesolenoidvalve
shouldbeclosed.Connectapressure
gauge to the test nipple Pa, see g.
Thetestpressureinthesystemshould
be 1,5x max. inlet pressure or min.
150 mbar. If any leakage, locate the
source by means of soapy water or
a leak location spray.After tightening
repeat the test.
Electric function test:
Ensure that phase and neutral are
not reversed. The gas shut-off cock
should be closed.To prevent the gas
pressure switch from locking out it
should be linked temporarily.
After the main switch has been
switchedonandthethermostatshave
been adjusted the pre-purging period
begins (30-35sec.).At the end of this
period the pre-ignition period starts
(0,5-2,5sec.dependentonthedesign
of the gas control). The gas valve is
energized and opens and ame is
established. At the end of the safety
time (2-3 sec.) the gas control locks
out.Thesolenoidvalveandthemotor
will be "dead". Remove the link from
the gas pressure switch after the test
is nished.
172 205 34 07-01
Leakage control
Gas train
Noteon2-stageandmodulatingburn-
ersthatduringthepre-purgingperiod
thedamperopens totheset valuefor
air on stage 2 and just before the end
ofthepre-purgingperioditgoesdown
totheairsettingforstage1.Onsome
burnersunder350kWthepre-purging
mainlytakesplacewiththeairdamper
set for stage 1.
NOTE! Applies only to gas burner
control LFL1.
WhenusingLPG(Propane)theburner
should be connected for post-purge.
Move connection to terminal 6 to ter-
minal 7 in the base of LFL1.
2-STAGE- OR MODULATING BURNERS
MultiBloc

MEASURES AND CHECKS BEFORE START-UP
Inner assembly
Town gas
Inner assembly
Natural gas, LPG
Inner assembly
Biogas ((UV-detector)
Propan Natural gas
172 205 18 08-01

172 205 16 07-01
If the barometer height, pressure and temperature of the gas deviate very much from the normal values this must
be taken into account as follows:
f = 273+t . 1013,25
273 B+Pu
t = Temperature of the gas at the gas meter (15°C)
B = Barometer height (945 mbar)
Pu= Pressure of the gas at the gas meter (15,0 mbar)
f = 273+15 . 1013,25
273 945+15
f = 11,1
The gas volume read on the gas meter actually reads 1,11 .12,9 = 14,4 m3/h.
Net caloric value
Gas quality kWh/Nm3kJ/Nm3kcal/Nm3
Natural gas 10,3 37 144 8 865
Propane 26,0 93 647 22 350
Butane 34,3 123 571 29 492
Town gas 4,9 17 653 4 213
Bio gas 7,0 25 219 6 019
V = Gas volume Nm3/h
Q = Boiler output 120 kW
Hu=Caloric value of the gas A. 37 144 kJ/Nm3, B. 10.3 kWh/Nm3
η=Expected efciency 90%
Ex. A v= Q .3 600 =120 .3 600 ≈12,9 Nm3/h
Hu· η37 144 .0,90
Ex. B v= 120 ≈12,9 Nm3/h
10,3 · 0,90
Example how to calculate the gas volume (natural gas)
DETERMINATION OF GAS VOLUME FOR THE INSTALLATION
Specications on natural gas, town
gasandbio gasvary. Formoreexact
information please contact the gas
distributor.

DUNGS COMBI BLOC WITH RATIO ADJUSTMENT MB-VEF BO1, 412 - 425
1. Electrical connection gas pressure switch mini
2. Electrical connection gas valve
3. Pressure switch mini
4. Flange connection inlet
5. Test point connection 1/8" before V1
6. Filter (on Multi-Bloc 425 external lter)
7. Data plate
8. Connection 1/8" PL
9. Adjustment screw V for ratio PBr: PL(max. load)
10. Test point connection 1/8" before V1(before governor)
11. Connection M4 for measurement of burner presssure after V2
12. Adjustment screw for zero point adjustment N (min. load)
13. Test point connection 1/8" PF
14. Test point connection 1/8" PBr(after V2burner)
15. Flange connection, outlet
16. Test point connection 1/8" Pa before V2(after governor)
17. Indication of V1and V2in operation (not standard)
18. Impulse ange PBr (gas pressure)
19. Impulse line PL(air pressure)
20. Impulse line (re room)
172 205 70 07-01
22
8. MULTI-BLOC
1. Electrical connection gas pressure switch mini
2. Electrical connection gas valve
3. Pressure switch mini
4. Flange connection inlet
5. Test point connection 1/8” before V
1
6. Filter (on Multi-Bloc 425 external fi lter)
7. Data plate
8. Connection 1/8” P
L
9. Adjustment screw V for ratio P
Br
: P
L
(max. load)
10. Test point connection 1/8” before V
1
(before governor)
11. Connection M4 for measurement of burner pressure after V
2
12. Adjustment screw for zero point adjustment N (min. load)
13. Test point connection 1/8” P
F
14. Test point connection 1/8” (after V
2
burner)
15. Flange connection, outlet
16. Test point connection 1/8” P
a
before V
2
(after governor)
17. Indication of V
1
and V
2
in operation (not standard)
18. Impulse fl ange P
Br
(gas pressure)
19. Impulse line P
L
(air pressure)
20. Impulse line (fire room)
It is possible to connect a leakage control VPS 504 and a gas pressure
switch maxi.
8.1 View
8.1.1 MB-VEF 412 - 425 B01
201379
19
8
6
5
4
3117 2 16 10 11 18
14
15
12
View
It is possible to connect a leakage control VPS 504 and a gas pressure
switch maxi.

Adjustment possibilities
Adjustment range
Effective burner pressure
∆
Effective fan pressure
∆
Adjustment range
MB-VEF
Adjustment range
- Impulse lines shall be mounted in such a way that
no condensate can ow back into the multibloc.This
is especially important when PFis concerned.
- Impulse lines shall be mounted in such a way that
they are protected against rupture and damage.
- Impulse lines shall be as short as possible
- Impulse lines should preferably be made of steel.
Inside diameter >ø 4 mm (steel tube ø 6/4)
- For PLother material can be used.
- Impulse lines PLand PBR are ready from factory
Mounting instruction - impulse lines PL, PFand PBr
- Max inlet pressure 360 mbar
- Valves V1+V2class A group 2 in accordance with EN
161
- Governor class A group 2 in accordance with EN88
- Ratio V PBr:PL 0,75:1-3:1
- Filter according to DIN 3386
- Ambient temperature -15°C- +70°C
- Protection standard type IP54 (according to IEC 529,
DIN 40050)
- Gas family 1 +2 +3
- Outlet pressure 0,5 - 100 mbar
- Zero point adjustment N ±2 mbar
- Pressure switch DIN3398 TI
- Fan pressure PL0,4-100 mbar
- Fire room pressure PF -2 -+5mbar
- Burner pressure PBr 0,5 - 100 mbar
TECHNICAL DATA WITH RATIO ADJUSTMENT
172 215 16 07-01
PBr = PBr - PF
PL= PL-PF
!
!
PL, max. = 100 mbar
PBr max. = 100 mbar
V = 3:1
V = 1:1
V = 0,75:1
V
V = 3:1
V = 1:1
V = 0,75:1
+ N
- N
∆pBr, min =0,5 mbar
∆pL, min =0,4 mbar
∆ PBr
∆PL
∆PL
∆ PBr
{
{
N=-2
N=+2

172 305 68 07-01
Adjustment of gas ow
–Before the burner starts vent
the lines to make sure that there
is gas available at the multibloc
–Use an allen key size 2,5 mm
for adjusting N and V.
–Connect a pressure gauge for
measuring PBr, (advisable to nd
out if the valves are open)
–Set the switch in position MAN.
–Set the gas pressure switch
min. and air pressure switch on
min. adjustment. Set the gas
pressure switch max, if any, on
max. adjustment.
–If necessary repeat the controls
of the adjustment made on min.
(N) and max. load(V).
–The desired gas ow on min.
and max. has now been ad-
justed by changing the orange
and the red cams. Check the
gas ow on the gas meter avai-
lable on the installation.
–Note! Do not forget to set the air
and gas pressure switches after
the adjustment, see special
instructions.
Releasing button
By pressing the button and snap-
ping it down, the motor will be
released and the damper can easily
be turned. This function facilitates
an exchange of damper motor.
–Start the burner, observe the
pressure gauge, if no ame is
established and the pressure
gauge needle does not icker,
increase N. When the ame is
established adjust the gas ow
by means of the screw N. Use a
ue gas instrument.
–Change over to max. load,
press the switch “increase”
–Adjust the gas ow with V and
check at the same time the
combustion values.
–Go back to min. load and check
the combustion value. Adjust if
necessary.
Damper motor, air volume
Adjust the orange cam for min. load
(about 5-10 on scale)
Adjust the red cam for max. load
(90° )
The blue cam is factory set for
closed position during standstill
The black cam has no function at
modulating operation
ADJUSTMENT OF GAS FLOW
Max. load (red)
Min. load (orange)
Closed damper (blue)
Gas valve (black)
Releasing button N.B.
The upper position is
the standard position

GENERAL INSTRUCTIONS
Adjustment of burner
Theburneris fromthefactory pre-set
toanaveragevaluethatmustthenbe
adjusted to the boiler in question.
All burner adjustments must be made
inaccordancewithboilermanu-facturers
instructions. These must include the
checking of ue gas temperatures,
average water temperature and CO2
or O2concentration.
General instructions
The installation of the gas burner
must be carried out in accordance
withcurrentregulationsandstandards.
The installers of gas burners should
thereforebeacquaintedwithallregu-
lationsandensurethattheinstallation
complies with the requirements. The
installation, mounting and adjustment
should be made with the greatest
care and only the correct gas should
be used.
Operating instructions
The operating instructions accom-
panying the burner should be left
in a prominent position in the boiler
room.
Instructions
The user should be thoroughly
instructed in the function of the gas
burner and the whole installation.
The supplier must instruct the user.
Inspection and maintenance
Daily inspection is advisable.
Start up
After the burner has been tted to
theboilerandtheelectricconnection,
the leakage control, the venting and
the electric function test have been
carried out, the burner will be ready
for start-up.
Howerer, study the sections dealing
with adjustments of multi-bloc, com-
bustion air and combustion head.
Opentheballvalveandswitchonthe
main switch. If the burner starts the
actual adjustment can be made.
Adjustment of burner head
The burner is equipped with an adjust-
ment device changing the position of
thebrakeplateintheburnerhead.This
is used to adjust the cor rect pressure
drop over the combustion device in
order to obtain a good pulsation free
combustion.
Which position to use depends on
input and overpressure in the boiler.
172 305 28 07-01
Ageneral rule is that the lower capacity
the smaller the opening between
brake plate and combustion device.
Commissioning of installation
Controlofthecombustion.Thecom-
bustion quality is checked by means
of a ue gas analysis device. Adjust
the burner to appr. 20% excess air
in accordance with the table. Check
the ue gas temperature. Calculate
the efciency. Check also the actual
gas volume on the gas meter so that
the correct input is achieved.
Service
Service should only be carried out
by qualied personnel. Replacement
partsshouldbeofthesamemakeand
approved by the same authorities as
theoriginal.Iftheburnerisconverted
to re another gas quality it must be
re-commissioned.Iftowngasistobe
red the combustion head must be
converted and the gas train adjusted
tosuit(e.g.alargergasarmatureora
different spring in the governor may
be required).
Gas quality CO2%
lambda 1,2 02%max. CO2%
Natural gas 10,0 3,5 11,9
LPG 11,5 3,5 13,9

172 305 25 07-01
Flame monitoring and measure-
ment of ionisation current
The burner is monitored according
to the ionisation principle. Check the
ionisation current on start-up and on
each service call.
The reason for a low ionisation current
maybeleakingcurrents,badconnec-
tion to earth, dirt or a faulty position
of the ame electrode in the burner
head.Sometimesalsoafaultygas/air
mixturemaycausetooweakaionisation
current.
The ionisation current is measured
by means of a microampere meter
(µA) connected in series with the
ame electrode and the gas burner
control.
Connect the µA-meter, see gure. Min.
required ionisation current according
to table. In practice this current must
be considerably higher, preferably
more than 10 µA.All the gas burners
are equipped with a ionisation cable
that can be slit which facilitates the
connection of the µA-device.
Gas pressure switches:
Adjustment range:
2,5-50 mbar GW 50
5-150 mbar GW 150
Adjustment of min. gas pressure
switch
Themin.pressureswitchshouldreact
if the gas pressure is too low and
prevent the burner from starting. Too
low a gas pressure during operation
should stop the burner. The burner
may start again when the rated gas
pressure has been reached.
Removetheprotectivecover.Connect
a pressure gauge for measuring the
rated pressure. Decide on pressure
atwhichthegasswitchshouldswitch
off.Set this pressure by means of the
valve. Carefully turn the knob (see
gure) until the gas pressure switch
switches off.The value shown on the
scale should then approximately cor-
respond with the value shown on the
pressure gauge. Tolerance on scale
appr. ± 15 %. Open the ball valve.
GENERAL INSTRUCTION
Adjustemnt of max. gas pressure
switch
The burner is equipped with a max.
gas pressure switch only on request.
It should stop the burner if the gas
pressure exceeds the set value. The
burner can then only be re-started
manually (gas burner control or
overpressure switch).
Removetheprotectivecover.Connect
a pressure gauge for measuring the
rated gas pressure. Decide on pres-
sureatwhichthegaspressureswitch
should switch off. Turn the adjustment
knob to this value. Tolerance on the
scale ±15%.
Adjustment of air pressure switch
Theairpresureswitchshouldstopthe
burner if the air volume is reduced.
The air proving device shall be adjusted
in such a way that if there is insufcient
air supply at the highest or lowest
burner operating stage, the device
operatesbeforethesupervisedpres-
sure is less than 80% of the pressure
at the controlled stage and the CO
content of the combustion products
exceeds 1% by volume.
Air pressure switch:
Adjustment range ca:
1-10 mbar LGW 10
2,5-50 mbar LGW 50
Flame monitoring
Gas pressure switch, air pressure
switch
Gas control Connection to terminal
in gas control Min. ionisation current required
LMG 12 µ A
LGB 110 µ A
LFL 24 10 µ A
MMI 810 25 µ A
TMG 740-3 15 µ A