Burner Starting Difficulties And Their Causes; Operating Faults - Riello Burners 40 Montage Und Bedienungs Anleitung

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 3 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 pe-
riod and the control box
goes to lock-out.
The burner does not start
at the thermostat closing.
The burner continues to
repeat the starting cycle
without going on lock-out.
N.B.:
If problems still occur after all of the above checks have been made, check the electrical connec-
tions on the plug and sockets, the damper and burner motor, gas control wiring ignition trans-
former and external interlocks, if the burner still fails to function, replace the control box.

OPERATING FAULTS

The burner goes to lock-out because of :
The burner shuts-down if the gas pressure switch opens.
2431
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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 in-
sulation to earth.
The ionization current is weak (lower than 3 µA).
The gas pressure switch is set too close to its working-pressure.
The valves are passing too little gas
(low pressure in the gas pipework).
The valves are defective.
The ignition arc is irregular or not present.
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 incor-
rect setting or a faulty switch.
The air pressure switch is changed over to the operational position.
The damper actuator is failed.
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 open-
ing of the valves causes the opening of the pressure switch.
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.
– Flame failure
– Ionization probe earthed
– Opening of the air pressure switch
9 GB
CAUSES