Enertech BG 700-2 Technical specifications

178 001 80
Installation- and maintenance instruction
BG 700-2

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 84 07-01
DESCRIPTION
Components
1. Flame cone
2. Guide bar
3. Electric panel
4. Fan wheel
5. Fan house
6. Shrouded disc
7. Ignition electrode
8. Nozzle
9. Ionisation electrode
19. Indicating lamp Stage I
20. Switch l-ll
21. Time meter, stage 1
22. Time meter, stage 2
23. Contactor with thermal
overload protection
24. Control box
25. Gas train
26. MultiBloc
10. Motor
11. 
12. Ignition transformer
13. Air damper
14. Air damper motor
15. Air pressure switch
16. Fuse holder
17. Indicating lamp Stage 2
18. Switch l-ll
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)
927
ø230
A
ø199
820
403
513
781
403
413
Capacity chart according
to EN 676
Out range
TECHNICAL DATA
1 
Natural gas 10 kWh/Nm3
LPG 26 kWh/Nm3
The above dimensions are max. measurements. Depending on the compo-
nents used, the measurements may vary.
172 215 46 07-01
Type designation BG 700
Dimensions
Approved natural gas Approved LPG
Length of burner
tube ± 5 mm
Flange
Measure A ± 5 mm
Standard 363 328
Long design 663 628
Type Capacity
kW
Gas volume at a min.
output Nm3/h 1)
Gas volume at a max
output Nm3/h 1)
Max. inlet
pressure mbar 3)
Natural gas LPG Natural gas LPG Natural gas LPG
700 300-1500 360-1650 30 13,8 150 62,5 100-360
Rated inlet pressure
mbar 2)
Connection 2) Motor Ignition transformer
Natural gas
50
LPG
50
Natural gas,LPG
2½", 1½"
3,0 kW, 2800 r/m
230/400 V
11,2/6,5A
Primary 230 V, 1 A
Secondary 8 000 V
2) Dimension and capacity depen-
ding on gas quality and available
inlet pressure
3) See data plate on the built-on
 

TECHNICAL DATA
172 215 48 07-01
14
(ø280)ø320-380
ø206

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)
SKELETON DIAGRAMS
1. Ball valve
2. Filter
3. Governor
4. Pressure gauge with shut-off cock
5a. Gas pressure switch, mini
5b. Gas pressure switch, maxi
Incorporated in the MultiBloc
6a. Main valve, 2 -stage
6b. Safety valve
1)7. Valve proving system
8. Air damper motor
9. Air pressure switch
10. Gas burner control

according to EN 676.
1) Required over 1200 kW according
to EN 676.
172 415 12 07-01
When Bio gas is used, Bentone shall always be contacted.

MOUNTING OF THE BURNER
172 205 88 07-01
To facilitate the mounting of the boiler

pull rods can be removed from the
burner.
DO LIKE THIS:
Loosen the screw "A" on both sides
and the two stop bolts at the end of
the pull rods. Remember that the
electric cables to solenoid valve and
gas switch are also disconnected.
When the burner head and the gas

it is easy to lift the burner on to the
pull rods.
If the gas assembly needs to be in-
spected the pull rods are very use-
ful.
Loosen the screw "A" and pull out
the burner on the pull rods. Loosen
the screws "B" and withdraw the gas
assembly.
Ensure that the O-ring between the

be in the correct position when the

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
Gas burner
FAULT LOCATION GUIDE
The basis for trouble free operation can only be ensured


these factors change troubles may arise.
It has been proved that many troubles have rather sim-
ple causes. Before calling the serviceman the following

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

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
callingtheserviceengineer, thefollowing

–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.
172 425 35 07-01
Design without A3 Design without S10
ELECTRIC EQUIPMENT
Gas burner control:LFL1...
Wiring diagram
1(2)
Damper position

172 425 35 07-01
2(2)
ELECTRIC EQUIPMENT
Gas burner control: LFL1...
List of components
A1 Gas burner control
A3 Valve, leak tester, Dungs VPS504
B1 Ionization electrode
F1 Operating fuse
F2 Operating fuse
F3 Operating fuse
H1 Lamp, low capacity
H2 Lamp, high capacity
K1 Motor contactor with thermal overload protector
K2 Auxiliary relay
M1 Burner motor
M2 Damper Motor L&S SQN75.494A21B
S1 Operating switch
S2 Operating switch, stage 2
S3 Control thermostat
S4 Temperature limiter
S5 Micro switch for hinged door
S6 Control thermostat, stage 2
S7 Main switch
S8 Air pressure switch
S9 Gas pressure switch
S10 Gas pressure switch, max
S20 Main switch
T1 Ignition transformer
X1 Connection terminal board
X2 Earth terminal
X3 Plug-in contact, burner
X4 Plug-in contact, boiler
X5 Plug-in contact, stage 2, burner
X6 Plug-in contact, stage 2, boiler
X7 Plug-in contact, 3 phase, burner
X8 Plug-in contact, 3 phase, boiler
Y1 Gas solenoid valve 1
Y2 Gas solenoid valve 2
Function
1. Operating switch ON-Thermostat ON-Gas pressure switch ON-Air dam-
per 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 full load. A control is made that the

3. Air damper motor closes.
The air damper motor closes to low load . Then the ignition spark is formed.
4. Main and safety valves open

5. The safety time expires.


locks out.
6. Operating position.
The burner is in operating position and can now change over to full load if the
operating switch and the thermostat for full load are in positon ON. The burner
can alternate between full and low load depending on set temperature.
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.
Mains connection and fuse in accordance with local
regulations.
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


inaccordancewithboilermanu-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
ELECTRIC EQUIPMENT
Technical data
 
 
 
 
Reset after lock-out Immediately
 
 
 
Supervision of ionization current
 
 
Short circuit current max. 0,5 mA
Min. required ionization current 6 µ A
Recommended range of measuring device 0...50 µ A
a - b
Start-up sequence
b - b´
"idle steps" up to the self shut-down
of the sequence switch
b ( b´) - a
Post-purge sequence
172 405 27 07-01
a
b´
b
In the event of fault conditions the
fuel supply is always interrupted
immediately and, simultaneously,
the sequence switch stops and thus
the lockout indicator. The symbol
appearing above the reading mark

P Interruption of the start-up
sequence, because the OPEN
signal has not been supplied to
terminal 8 from damper motor
to switch «max.». Terminals 6,
7and 14 are under tension until
the fault has been remedied.
1 the fault has been remedied.
Lockout   
signal has been received on
completion of the 1st safety
time.


time also causes the control
to go to lockout!
◄No start, because, e.g., the
CLOSE signal has not been
supplied to terminal 8 or a
contact has not been closed
between terminals 12 and 4
or 4 and 5.
▀ Lockout due to a fault in the
 2 Lockout,    signal has been received on
completion of the 2nd safety

   
burners).
▲Interruption of the start-up
sequence, because the OPEN
signal has not been supplied to
terminal 8 from damper motor
to switch «max.». Terminals 6,
7and 14 are under tension until
the fault has been remedied.
▼ Interruption of the start-up
sequence, because the posi-
    
position has not been supplied
to terminal 8 by the damper
motor. Terminals 6, 7 and 14
are under tension until
▌ Lockout, 
signal has been lost during
burner operation or air pressure
failure has occured.
◄ Lockout on completion
of control programme se-
quence due to extraneous light

leaking fuel valves) or due to

Control programme under fault conditions and lockout indication
gas burner control: LFL1....

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
172 505 03 08-01
Flow adjustment 2-stage design
For stage 1, loosen the lock screw



For stage 2, turn the hydraulic



Do not forget to tighten the lock
screw again.
ADJUSTMENT OF MULTI-BLOC, MB-ZRDLE 405-420
Adjustment of governor

by means of a screw driver. Min. and
max. outlet pressures correspond to
appr. 60 turns of the spring. It is not
possible to change pressure springs in
order to change the outlet pressure.
Turn to the right = the outlet pressure
is increased
Turn to the left = the outlet pressure
is reduced

Remove the protective cover c.

protective cover as a tool) to the de-


is reduced

increased
Adjustment of governor
Multi-bloc MB-ZRDLE 405-420

Flow adjustment
2(2)

172 505 03 08-01
MULTI-BLOC, MB-ZRDLE 405-420
1. Ball valve
2. 
3. Gas pressure switch
4. 
ment
5. -
ment
6. 
stage 2
7. 
8. Main valve
9. 
10. Test nipple, inlet pressure
11. Test nipple, pressure after
governor
12. Test nipple, before governor
13. Filter


405 - 412 S50 = 4 - 50 mbar
415 - 420 S20 = 4 - 20 mbar
415 - 420 S50 =20 - 50 mbar

     
and stage 2.
1(2)
MEASURES AND CHECKS BEFORE START-UP
172 205 89 10-01
Inner assembly
Natural gas, LPG
Inner assembly
Natural gas
Inner assembly
LPG
Inner assembly
Biogas (UV-detector)
45°
3-4
≈
1
10-12
3-3,5
15-20

172 205 16 07-01
If the barometer height, pressure and temperature of the gas deviate very much from the normal values this must

f =  . 1013,25
273 u
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 =  . 1013,25
273 
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.
172 305 54 08-01
FUNCTION, 2-STAGE DESIGN
Air adjustment
The damper motor turns the damper

closed, low load, full load. These
positons are controlled in the motor
by cams of different colours. The
black cam controls the gas valve for
full load.
Low load:

load (ll).
 
Turn orange cam towards 0°
 
Turn orange cam towards 90°

low load and check the air volume.
Full load

load (l).
 
Turn red cam towards 0°
 
Turn red cam towards 90°
If the red cam is moved, change the
black cam as much.

load and check that the correct air
volume has been obtained.
Note!
The blue cam is the limit position for
fully closed damper and it is normal-
ly not necessary to change it.
Low load (orange)
Full load (red)
Closed damper (blue)
Solenoid valve full load (black)
     
Remove the cover of the damper
motor and change the position of the
cams by turning them with the tools
accompanying the burner.