Air Regulation - Ygnis MAX 4 Manual

B
LB1573 Max 4 - 8 - 12
NOZZLE CLEANING AND REPLACEMENT
Use only the suitable box wrench provided for this operation to remove the nozzle, taking care to not damage
the electrodes. Fit the new nozzle by the same care. Note: Always check the position of electrodes after having
replaced the nozzle (see illustration). A wrong position could cause ignition troubles.
4 mm 3 mm
5/6 mm
BURNER START-UP AND ADJUSMENT
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 burner. The control box feeds at the same time the ignition transformer and the burner's motor,
which will run a prepurging of the combustion chamber for about 12 seconds. 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 tran-
sformer. 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 boi-
ler's thermostats make, the ignition signal shall be done by the thermostat mounted on the preheater itself.

AIR REGULATION

FIRING HEAD SETTING
pag.10