21
20123476
GB
Electrical wiring
7.5.11 Frequency supply error
The control-box automatically detects the value of the frequency
of the main supply in the range of 50 - 60 Hz, in both cases work-
ing times are verified. The fault is indicated by way of the blinking
LED (see paragraph “Fault diagnostics - lockouts” on
page 19).
➤
If the anomaly is detected before heat demand the burner
does not start.
➤
If the fault is detected during the pre-purging, the burner
remains in purge condition and the fault is appropriately sig-
nalled.
➤
The fault is not detected during normal running, the burner
remains in this state.
When the fault disappears, the burner restarts.
7.5.12 Internal voltage anomaly
The control-box automatically detects if the internal voltage
works correctly. The fault is indicated by way of the blinking LED
(see paragraph “Fault diagnostics - lockouts” on page 19).
➤
If the anomaly is detected during the initialisation check time,
the burner does not start.
➤
If the anomaly is detected after a lockout the burner does not
start.
➤
If the anomaly is detected after a shut-down test, the burner
does not start.
➤
The fault is not detected during normal running, the burner
remains in this state.
When the fault disappears, the burner restarts.
7.5.13 Checking the fan motor
The control box automatically detects the presence of the fan mo-
tor and, in the event of a fault, it performs a lockout. The lockout
is indicated by the blinking of the LED (see paragraph “Fault di-
agnostics - lockouts” on page 19).
7.5.14 Checking the electronic circuit controlling the
oil valve
The control box detects the presence of a fault inside the elec-
tronic circuit controlling the oil valve, the fault is indicated by the
blinking LED (see paragraph “Fault diagnostics - lockouts” on
page 19):
➤
if the anomaly is detected during the initialisation, the burner
goes into lockout.
➤
if the anomaly is detected during the pre-purging, the burner
goes into lockout.
➤
During a recycling, if the fault is detected, the burner does
not start and goes into lockout.
➤
If the fault is not detected during running position the burner
remains in operation.
The fault is not detected if the burner is in lockout.
7.5.15 EEprom check
The control box automatically detects if EEprom memory of mi-
cro-controller has failed and will perform a lockout. The lockout is
indicated by the blinking of the LED (see paragraph “Fault diag-
nostics - lockouts” on page 19).
7.6
Post-purging
Post-purging is a function that allows you to maintain the air purg-
ing even after the burner is switched off in the absence of the heat
request for a pre-set time.
The burner switches off the flame when the heat request thermo-
stat opens, cutting off the fuel supply to the valves.
The post-purging function is not performed:
➤
after a lockout
➤
if the heat request is interrupted during pre-purging.
Post-purging occurs:
➤
if the heat request is interrupted during the safety time;
➤
if the heat request is interrupted during normal operation.
NOTE:
If during post-purging there is an extraneous light or a para-
site flame the burner goes into lockout after 25 seconds.
If during post-ventilation there is a new heat request, the
post-purging time is halted, the fan motor stops and a new
burner operating cycle starts.
