Servicing Manual
27
3.14 CHECKING/CLEANING/ADJUSTING/
REPLACING ELECTRODES
•
Extract the burner head.
Ill. 44
•
Check that the electrode tips are clean.
•
If not, clean them with a soft brush and then
with compressed air.
•
Check the clearances between electrode tips
and between electrode tips and nozzle.
•
Adjust the clearances according to the diagram
below :
To check that ignition spark is regular:
•
Insert the nozzle holder into the burner head
and fix it wih a proper screw.
•
Completely open the air lock.
•
Disconnect the solenoid fuel valve from
mains.
•
Give power to the heater and allow a start
cycle to take place turning the ON/OFF switch
to I (ON).
•
Visually check that the ignition electrodes
produce a regular spark .
Warning
At ignition, an 11 kW high voltage is produced
between the electrode tips. Carefully follow the
electrical safety regulations during all servicing
and maintenance operations.
•
Reconnect the solenoid valve leads after
checking spark.
To replace the electrodes:
•
Disconnect the high voltage leads from
electrodes.
•
Unscrew the electrode fixing screws.
Ill. 45
•
Replace the electrodes and reconnect the high
voltage leads.
•
Reassemble the burner head.
3.15 CHECKING AND REPLACING HIGH
VOLTAGE CABLES
•
Check that the high voltage cables are properly
connected.
•
Check the conditions of high voltage cables
and look for possible damages.
Disconnect the high voltage cables from
electrodes and from the ignition transformer in
the electrical board.
