Bentone BG 450 M Technical specifications

160 009 24
Installation- and maintenance instruction
BG 450 M

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.
– 
– 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.
– 

– 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

– If another electrical connection is used than the one recommended by

– 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. 
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. 
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, 1 A
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 
Natural gas 10 kWh/Nm3
LPG 26 kWh/Nm3m3
2) Dimension and capacity depen-
ding on gas quality and available
inlet pressure
Length of burner Flange
tube Measure A
Standard 256 226
Long design 356 326
The above dimensions are max. measurements. Depending on the components
used, the measurements may vary.
172 215 50 08-01

TECHNICAL DATA
DIMENSIONS OF FLANGE
172 215 19 08-01
172 905 95 09-01
We
(supplier´s name)
ENERTECH AB
(Address)
Box 309, S-341 26 Ljungby, Sverige
declare under our sole responsibility that the product
(name, type or model, batch or serial number, possibly sources and number of items)
BG100, BG150, BG200, STG120, STG146, BG300, BG300LN, BG400, BG400LN, BG450, BG450LN,
BG500, BG550, BG550LN, BG600, BG600LN, BG650, BG700, BG 700LN, BG800, BG800LN and BG950
all fan gas burners
to which this declaration relates is in conformity with the following standard(s) or the normative socument(s)
(title and/or number and date of issue of the standard(s) or other normative document(s)
EN 676, DIN 4788
following the provisions of Directive
(if applicable)
Gas directive 90 / 396 / EEC, EMC directive 89 / 336 / EEC och Low voltage directive 73 / 23 / EEC
Ljungby 090126
(Place and date of issue)
ENERTECH AB
Sven-Olov Lövgren
(name and signature of equivalent marking of authorized person)
DECLARATION OF CONFORMITY

170 091 16 08-01
The ambient temperature of the gas relay is too high Heat insulate, max. 60° C.
The ignition spark is too weak Check the transformer
Bad combustion
Bad draught conditions Check the chimney
 The boiler is overloaded. Reduce the quantity of gas.
The CO2-content is too low Check the boiler with regard to leaks. Choke the draught
if it is too high.
The CO-content is too high
Excess air when using natural gas and gasoil
(propane, butane
Choke the air.
Air shortage 
The holes in the gas nozzle are clogged Clean.
The fresh air intake is too small Check and enlarge.

head is out of position

Condensation in boiler and chimney



gas supply. Insulate the chimney
REMEDY
CAUSE
4(4)
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) Required over 1200 kW according
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
       
dimensions see technical data.
If for some reason you want to sepa-
   
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

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

- Withdraw the gas assembly.
Ensure that the O-ring between the

be in the correct position when the

Adjustment of the position of the
shrouded disc in the blast tube

the position of the shrouded disc in
the blast tube. This can be done with

the burner is in operation). If you turn
the screw to the left the shrouded
disc will move forward (+), to the right
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
have to remove the nozzle assembly
from the connecting pipe and move
the assembly backwards in the fan
housing (from the boiler).
170 091 16 08-01
Voltage lower than 185 V Contact the electricity authorities.
The ignition electrodes are disturbing the
ionisation current

transformer if necessary.
Bad earthing Arrange for proper earthing.
Phase and neutral transposed See wiring diagram and change.
The burner locks out during pre-purge

 Reduce or increase the gas supply. Reduce the quantity
of air.
The gas pressure is too low Increase the pressure. Contact the gas supply company
if necessary.
Pulsations at start
 
The gas pressure is too high 

 
Pulsations during operation
 
The burner is dirty Clean the burner.
Defective chimney Check and change the dimensions if necessary.
The burner is operating correctly but locking out now
and then
The ionisation current is too low Check. Must be at least 4 µ A according to the relay
manufacturer but should be 8-20 µ A.
The UV-cell is in a wrong position 
Voltage drop at certain times -
tact the electricity authorities if necessary.

Spark-over in ignition electrodes Replace the electrodes
REMEDY
CAUSE
3(4)

170 091 16 08-01
The cable shoes have bad contact Improve the contact
The ignition cables are damaged Replace
The ignition transformer is damaged, no voltage
on the secondary side
Replace the transformer
The ignition cable and the ionisation cable have
been transposed.
Change

free start
The gas solenoid valve defective Replace
The gas solenoid valve does not open in spite of
its obtaining voltage
Replace coil or the whole valve if necessary.
No voltage to the solenoid valve Check the contact
No electrical connection through the air
pressure switch

switch
 Reduce or increase the gas supply, reduce the quantity
of air
Gas relay defective Replace
 
No reponse as the cams of the servomotor are

The burner locks out after the safety time has

No ionisation current or the UV-cell in wrong position 
cables and connections.
The supervision part of the gas relay is defective Replace the relay
REMEDY
CAUSE
2(4)
172 445 05 08-01
ELECTRIC EQUIPMENT
Gas burner control: LMG22.../LME22...
Wiring diagram
1(5)
If there is no Plug- in contact (X4) on the boiler, connect to the contact enclosed.

172 445 05 08-01
ELECTRIC EQUIPMENT
List of components
Function Gas burner control: LMG22.../LME22...
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

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

5. The safety time expires.


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.
8. The control locks out.
The red lamp in the control is lit. Restart the burner by pressing the reset button.
Mains connection in fuse in accordance with local regulations.
2(5)
LIST OF COMPONENTS
A1 Gas burner control
A6 Power control R316
A6(2) PT 100-sensor, Thermocouple, current/voltage
B1 Ionization electrode
F1 Operating fuse
F4 Operating fuse 1A
H1 Operating lamp
H3 Alarm signal 230 V
K1 Contactor
M1 Burner motor
M2 Damper Motor, L&S SQN75.624A21B
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
T1 Ignition transformer
X1 Connection terminal board
X2 Earth terminal
X3 Plug-in contact, burner
X4 Plug-in contact, boiler
X9 Plug-in contact, power controller
R316, burner
X10 Plug-in contact, power controller R316
Y1 Gas solenoid valve 1
Y3 Safety solenoid valve
170 091 16 08-01
Gas burner
FAULT LOCATION GUIDE
The basis for trouble free operation can only be ensured
by the correct combined effect of the three factors:

these factors change troubles may arise.
It has been proved that many troubles have rather sim-
ple causes. Before calling the serviceman the following
checks should be made:
1. Are the gas cocks of the installation open?
2. Are the fuses in order and the current switched
on?
3. Are the controls (room thermostat, boiler thermostat

4. 
5. Is the gas relay of the burner ready for start and
not locked out?
6. 
To facilitate fault location we have drawn up a scheme
showing the most frequent faults in a gas burner instal-
lation and the remedies.
REMEDY
The burner does not start
No gas Check that all gas cocks are open.
No voltage Check fuses, thermostats and electrical connections
The burner motor fails to start The thermal protection has locked out. Motor
defective.
The gas relay is defective Replace
Burner motor is running but no ignition after
the prepurge time has elapsed
No voltage on the terminals Check the contact. Replace faulty relay
The ignition electrodes in contact with each other
or with earth

The porcelain of the electrodes is broken Replace the electrodes
CAUSE
1(4)

HANDING OVER OF THE INSTALLATION
172 305 17 07-01
–Make repeated start attempts to

function.
–Close the ball valve during
operation to check that the gas
switch switches off at the set
value.
–Remove the hose for the air
pressure switch to check that
the burner locks out.
–Check that all protective covers
and measurement nipples are
mounted and fastened.
–Fill out necessary test reports.
–Instruct the persons in charge
of the operation on the service
and maintenance of the installa-
tion and what to do should any
troubles occur.
–Inspection and service must
only be carried out by author-
ized people.
Fault location, functional troubles
Trouble free operation is dependent
on three factors: electricity, gas and air
supply. Should there be any changes
in the ratio between these three factors
there is a risk of break downs. It has
been proved that most break downs
are caused by simple faults. Before
calling theservice engineer, the following
should therefore be checked:
–Is the gas cock open?
–Are all fuses in order and the
current switched on?
–Are the thermostats correctly
set?
–Are pressostats, overheating
protection etc. in operating posi-
tion and not locked-out?
–
–Is the gas burner control in start
position?
–Has the gas control or the motor
protector locked out? - Reset.
–Is the circulation pump in opera-
tion?
–Is there a supply of fresh air to
the installation?
If integral components are of a
different make from what is stated
in this manual, see the enclosed
loose-leaf.
172 445 05 08-01
Control diagnosis under fault conditions and lockout indication LMG ....
Diagnosis of cause of fault
AL
FS
Red LED on
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:
Error code table
Blink code Possible cause
2 x

 
- Faulty or soiled detector electrode
- Faulty or soiled fuel valves
 
3 x

 
 
 
- Fan motor does not run
4 x

 
light on burner startup
 
 
5 x

 
- Or internal device fault
6 x

Free
7 x

 
 
- Faulty or soiled fuel valves
- Short-circuit between detector electrode and ground
8...17 x

..................


Free
18x


 
 
 
19 x


 
- Wiring error
- External power supply on output terminal
20 x


 
During the time the cause of the fault
is diagnosed, the control outputs are
deactivated.
- The burner remains shut down

at terminal 10
The burner is switched on only after
a reset is made.
- Press lockout reset button
for 0.5...3 seconds
ELECTRIC EQUIPMENT

3(5)
A1 = LMG
GP
R/W
Q1 = AGQ2...
QRA
12 211 1
br bl rt Sw
rtSw
Blink code

Fault
Press lockout reset button
for > 3 s Off Blink code
Approx.
3 s

172 445 05 08-01
ELECTRIC EQUIPMENT
Control program when disruption; disruption display LME ....
Colour codes
Colour code table for multi-coloured signal lamps (Light diodes)
Status Colour codes Colours

times
○………………… Off.
Ignition phase, ignition checked ○ ○ ○ ○ ○ Flashing yellow.
Normal operation  Green.
  Flashing green.

start up
 Green-Red.
Undervoltage  Yellow-Red.
Disruption, alarm  Red.
Flashing code for fault codes  Flashing red.
Interface diagnostics  
AL
FS
lights red
Light period (waiting time  Flash code Pause Flash code
Approx. 3 s
Press the
reset button > 3s
Diagnostics alarm trigger
The red alarm signal lamp lights continuously after the alarm is disconnect-

sequence:

 
 
 
 Green
Limit on start attempts


three start attempts if the start cycle is uninterrupted.
4(5)
172 305 25 11-01
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
may be leaking currents, bad connec-
tion to earth, dirt or a faulty position
   
head. Sometimes also a faulty gas/air
mixture may cause too weak a ionisation
current.
The ionisation current is measured
by means of a microampere meter
(µA) connected in series with the
    
control.

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:

2,5-50 mbar GW 50
5-150 mbar GW 150
Adjustment of min. gas pressure
switch
The min. pressure switch should react
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.
Remove the protective cover. Connect
a pressure gauge for measuring the
rated pressure. Decide on pressure
at which the gas switch should switch
off. Set this pressure by means of the
valve. Carefully turn the knob (see

switches off. The value shown on the
scale should then approximately cor-
respond with the value shown on the
pressure gauge. Tolerance on scale

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).
Remove the protective cover. Connect
a pressure gauge for measuring the
rated gas pressure. Decide on pres-
sure at which the gas pressure switch

knob to this value. Tolerance on the

Adjustment of air pressure switch
The air presure switch should stop the
burner if the air volume is reduced.


air supply at the highest or lowest
burner operating stage, the device
operates before the supervised pres-

at the controlled stage and the CO
content of the combustion products

Air pressure switch:

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
LME 15 µ A
LGB 110 µ A
LFL 24 10 µ A
MMI 810 25 µ A
TMG 740-3 15 µ A

GENERAL INSTRUCTIONS
Adjustment of burner
The burner is from the factory pre-set
to an average value that must then be


in accordancewith boilermanu-facturers
instructions. These must include the
    
average water temperature and CO2
or O2concentration.
General instructions
The installation of the gas burner
must be carried out in accordance
with current regulations and standards.
The installers of gas burners should
therefore be acquainted with all regu-
lations and ensure that the installation
complies with the requirements. The

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
      
the boiler and the electric connection,
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
-
bustion air and combustion head.
Open the ball valve and switch on the
main switch. If the burner starts the

Adjustment of burner head
-
ment device changing the position of
the brake plate in the burner head. This

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
A general rule is that the lower capacity
the smaller the opening between
brake plate and combustion device.
Commissioning of installation
Control of the combustion. The com-
bustion quality is checked by means


in accordance with the table. Check


gas volume on the gas meter so that
the correct input is achieved.
Service
Service should only be carried out

parts should be of the same make and
approved by the same authorities as
the original. If the burner is converted

re-commissioned. If town gas is to be
  

to suit (e.g.a larger gas armature or a
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
172 445 05 08-01
ELECTRIC EQUIPMENT
Alarm control table LME ....


signal lamp (LED))
Possible causes
Flashing 2 x


 
- Defective or obscured fuel valves.
- Poor burner installation.
- Defective ignition unit.
Flashing 3 x


 
 
Flashing 4 x


Flashing 5 x


 
Flashing 6 x

Free
Flashing 7 x


- Poor burner installation.
- Defective or obscured fuel valves.
 
Flashing 8x

Free
Flashing 9x

Free
Flashing 10 x

Connection fault or internal fault, outgoing contacts
or other fault.
Flashing 14 x


CPI contact not closed.
During alarm trigger diagnostics, control outputs are to be disconnected
from all power.
- The burner is disconnected.
 
The burner is only to be reconnected after it is reset.
- Press the reset button 0.5...3 s.
A1 = LME
Q1=AGQ 3...
br bl rt sw
sw
GP
R/W
bl
QRA
LN
12 211 1
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

reset button 0.5...3 s.
5(5)

MEASURES AND CHECKS BEFORE START-UP,
General rules
Care should be taken by the installer
to ensure that no electrical cables or
fuel/gas pipes are trapped or damaged
during installation or service/mainte-
nance.
Inner assembly
Ensure that the ignition and ionisation

sketch shows the correct measure-
ments.
Gas quality
Ensure that the burner head is meant

Venting
The gas line is vented by loosening the
screw on the test nipple for the inlet
pressure. Connect a plastic hose and
conduct the gas into the open. After
having vented the gas line tighten
the screw again.
Leakage control
When making a leakage control of the
gas supply system the solenoid valve
should be closed. Connect a pressure

The test pressure in the system should
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
switched on and the thermostats have

begins (30-35sec.). At the end of this
period the pre-ignition period starts
(0,5-2,5 sec. dependent on the design
of the gas control). The gas valve is
     
established. At the end of the safety
time (2-3 sec.) the gas control locks
out. The solenoid valve and the motor
will be "dead". Remove the link from
the gas pressure switch after the test

172 205 34 07-01
Leakage control
Gas train
Note on 2-stage and modulating burn-
ers that during the pre-purging period
the damper opens to the set value for

of the pre-purging period it goes down
to the air setting for stage 1. On some
burners under 350kW the pre-purging
mainly takes place with the air damper
set for stage 1.
NOTE! Applies only to gas burner
control LFL1.
When using LPG (Propane) the burner
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
172 305 68 07-01

–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

–Connect a pressure gauge for
measuring PBr
out if the valves are open)
–Set the switch in position MAN.
–Set the gas pressure switch
min. and air pressure switch on

pressure switch max, if any, on

–If necessary repeat the controls

(N) and max. load(V).
–
and max. has now been ad-

and the red cams. Check the
-
lable on the installation.
–Note! Do not forget to set the air
and gas pressure switches after

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

established and the pressure



by means of the screw N. Use a

–Change over to max. load,
press the switch “increase”
–
check at the same time the
combustion values.
–Go back to min. load and check

necessary.
Damper motor, air volume

(about 5-10 on scale)

(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

Adjustment possibilities

Effective burner pressure

Effective fan pressure


MB-VEF

- Impulse lines shall be mounted in such a way that
 
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
- 
- 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
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.

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=3, B. 10.3 kWh/Nm3
η=
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
  
gas and bio gas vary. For more exact
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. 
7. Data plate
8. Connection 1/8" PL
9. Br: PL(max. load)
10. Test point connection 1/8" before V1(before governor)
11. Connection M4 for measurement of burner presssure after V2
12. 
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. Br (gas pressure)
19. Impulse line PL(air pressure)
20. 
172 205 70 07-01
201379
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It is possible to connect a leakage control VPS 504 and a gas pressure
switch maxi.