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LB752 Minor 4.1/8.1/12.1 - R
B
BLAST TUBE DISASSEMBLY
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 sames are sealed.
- The type of fuel, which must be suitable for burner.
- The connection of boiler’s thermostats and all safeties.
- The motor direction of rotation.
- The correct calibration of the motor’s thermal protection.
When all said conditions are checked and accomplished, it is possible to go on with burner’s tests. Power the bur-
ner. The control box feeds at the same time the ignition transformer and the burner’s motor, which will run a pre-
purging of the combustion chamber for about 13 seconds (20 seconds with Brahma control box). At the end of
prepurging, the control box opens the fuel pump solenoid valve, the ignition transformer produces a spark and the
burner ignites. After a safety interval of 5 seconds and a correct ignition, the control box turns off the ignition
transformer. In case of faulty ignition, the control box switches the burner into safety condition within 10 secs. In
such a case, the manual rearming of the burner shall not take place before 30 seconds are elapsed from the burner’s
safety shutdown. The fuel pump feeding pressure, must keep around 12 bar. Note: With preheated version, the
burner runs a preheating of the combustion head for about 1 minute. In such a case, at the boiler’s thermostats
make, the ignition signal shall be done by the thermostat mounted on the preheater itself.
BURNER START-UP AND ADJUSMENT
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