Gas/Light-oil dual burners must always be adjusted for a first light-oil ignition.
Once having installed the burner, check the following items:
- The burner power feeding and the main line protection fuses
- The correct length of pipes and that the same are sealed.
- The type of fuel, which must be suitable for burner.
- The connection of boiler’s thermostats and all the safeties.
- The motor rotation direction.
- The correct calibration of the motor’s thermal protection.
When all the above mentioned conditions are checked and accomplished, it is possible to go on with burner’s tests.
To turn the switch on the position “1” light-oil.
Power the burner. The control box feeds the ignition transformer and
the burner’s motor at the same time, which will run a prepurging of the combustion chamber for about 20 sec.
At the end of prepurging, the control box opens the fuel pump and the 1st stage (Low flame)
solenoid valves, the ignition transformer produces a spark and the burner ignites. After a safety
interval of 3 seconds and a correct ignition, the control box turns off the ignition transformer
and, 10 seconds later, sets the motorised air damper to its maximum opening and opens the
2nd stage solenoid valve (High flame). In case of faulty ignition, the control box switches the
burner into safety condition. In such a case, the manual rearming of the burner shall not take
place before 30 seconds have elapsed from the burner’s safety shutdown. In order to obtain an optimal combustion, it is
necessary adjust the LOW - HIGH flame air flow, according to the instruction given further on. During such a phase,
it will be possible to manually switch between HIGH ( II ) and LOW ( I ) flame and viceversa, through the High/Low
flame switch. At the end of the adjusting phase, leave the switch in position II (HIGH flame).
15
EN
420010331102
M ulticalor 45 ÷ 140 AB/AB
4
3
2
1
3. Regulate gas capacity in high flame through the gas governor, or operate on the adjustable gas valve.
LOW FLAME
4. Choose the first stage position on the servocontrol ( normally between 10° - 30°) on the basis of the reduced charge
output required and switch the burner to low flame.
5. Regulate gas capacity, to obtain optimal combustion, changing the position of the gas valve disc, act on screw “ 3 “,
after loosen nut “ 4 “.
Final operations
6. Bring the burner in high flame again, if necessary adjust again gas flow (as shown in point n.2).
7. If necessary repeat operations described on point n. 5 and n. 6 until You obtain the exact position of the gas flow
both in high and low flame.
8. Fix the nuts.
0
1
2
0 - STOP
1 - GASOLIO
2 - GAS
LIGHT-OIL
OPERATION OF BURNER WITH LIGHT-OIL FUEL
