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BURNER STARTING DIFFICULTIES AND THEIR CAUSES
DIFFICULTIES
The burner goes through
the pre-purge period nor-
mally, the flame ignites,
but the burner goes to
lock-out within 5 seconds
after the ignition.
The burner goes to lock-
out,
after the pre-purge
period, because the flame
does not ignite.
The burner does not pass
through the pre-purge peri-
od and the control box
goes to lock-out.
The burner does not start
at the thermostat closing.
The burner continues to re-
peat
the
starting
without going on lock-out.
OPERATING FAULTS
Re-cycle and lock-out may occur, because of : – Flame failure
The burner goes to lock-out because of . . . . : – Opening of the air pressure switch
Burner stop because of. . . . . . . . . . . . . . . . . . : – Gas pressure switch opening
2044
The ionization probe is earthed or not in contact with the flame, or
its wiring to the control box is broken, or there is a fault on its insula-
tion to earth.
The connection of the phase and neutral leads has been inverted:
you need to exchange it.
The wiring to the earth is lacking or ineffective.
The valves are passing too little gas (low pressure in the gas pipe-
work).
The valves are defective.
It is irregular or the ignition arc is not present; in this case remove
the control box and insert it again, taking care that the electrode
push-rod is in the proper seat.
The pipe has not been purged from the air.
The air pressure switch does not change over: it has failed or the air
pressure is too low (combustion head bad set).
Flame simulation exists (or the flame really lights).
Gas is not supplied.
The gas pressure switch does not close its contact due to incorrect
setting or a faulty switch.
The air pressure switch is changed over to the operational position.
The damper actuator is failed.
Before to replace the control box, check that short-circuits are not
present on the power-line: of the motor, of the gas electrovalve/s
and on the external signaling devices.
This concerns a very particular irregularity, caused by the fact that
the gas pressure in the gas-mains lies very close to the value to
which the gas pressure switch has been set.
As a result of this, the sudden falling-off of pressure at the opening
of the valves causes the opening of the pressure switch.
cycle
However this only temporarily, because the valves immediately
close again, so then does the pressure switch, because the pres-
sure builds-up again the cycle to be repeated over and over.
This can be remedied by lowering the setting of the pressure switch.
CAUSES
: – Ionization probe earthed
9
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