It may however fail to light, in which case the boiler lock-
out lamp will be activated. The main causes maybe:
−−
No gas supply
The equipment performs regularly sending voltage to
the ignition electrode that continues to spark for max.
10 seconds, without detecting the burner starting, then
it shuts down.
It may occur at the first starting or when the boiler has
not been used for a long period of time and there is air
in the pipes. It may occur if the gas cock is closed or if
the winding of one of the valve coils is interrupted, thus
preventing it from opening.
−−
There is no spark
In the boiler you will only notice the gas flow to the bur-
ner, after 10 seconds it shuts down.
It may be due to the fact that the electrode cable is
disconnected or is not properly fixed to the terminal 10;
or the equipment transformer is burnt.
−−
No ionisation
From the time of the starting you can observe the
electrode continuos sparking even if the burner is on.
After 10 seconds the sparking stops and so does the
burner, while the lock-out lamp appears to be on.
It occurs if the phase and neutral position on the termi-
nal board has not been observed.
The detection electrode cable is disconnected or the
electrode itself is earthed; the electrode is very worn-
out and needs replacing.
NOTE: Should the programmer shut off, press the
lock out lamp only after having waited at least
10 seconds since the lamp turned on.
Otherwise the equipment will not be unlocked.
The sudden lack of voltage causes the immediate shut-
down of the burner and when the voltage is restored the
boiler will automatically restart.
2.10.2 Ionization circuit
The ionization circuit shall be checked with a normal
microammeter, or even better, with a digital microamme-
ter with a 0-50 µA range. The microammeter terminals
shall be electrically connected in series to the ionisation
electrode cable. Under standard conditions the value
varies from 4÷6 µA. The minimum ionization current
value, at which the equipment may shut down, is approxi-
mately 1 µA. In this case it will be necessary to check that
there is a good electric contact and to check the wear of
the electrode tip and of its ceramic protection.
8
KEY
IG Main switch
P Circulating pump
TC Boiler stat
TS Overheat stat
TF Smoke stat
EA Ignition electrode
ER Ionisation electrode
A FM 11 programmer
EV1 Modulating coil
EV2 Modulating coil
R Lock out lamp
TA Room stat
FA EMC filter
NOTE: When a room stat is to be
fitted remove the link
between terminal 1 and 4
on the connector plug.
Fig. 10
2.10.3 “RX CE IONO” boiler wiring diagram
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