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Start-up, calibration and operation of the burner
8.8.10
Limitations in the control of the heat request
thermostat (HT)
The condition required for reading the heat request is that the re-
set push-button on the control box has not been pressed.
A fault with the reset push-button integrated on the control box (or
else if it is kept pressed) does not allow the state of the heat re-
quest thermostat to be read and as a result the burner does not
start. If the heat request thermostat is closed and the reset push-
button is pressed, or if the heat request thermostat opens while
the reset push-button is being pressed, the heat request is tem-
porarily maintained at a maximum for 60 seconds, then the heat
request will be reset, thereby stopping the burner and signalling
the fault of a blocked reset push-button.
If the heat request thermostat opens while the reset push-button
is being pressed to access the programming menu, it remains in
request until the reset push-button is released.
8.8.11
Reset protection
The burner can be released by pressing, for at least 0.4 seconds,
the reset push-button integrated in the control box and the un-
locking occurs only when the reset push-button is released.
NOTE:
The burner can be reset only 5 times consecutively, then
power supply has to be disconnected for a new 5 reset pos-
sibilities.
The burner can only be reset if power supply is applied to the
control box.
8.8.12
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 means of the blink-
ing LED (see section 8.8.2).
If the anomaly is detected before heat demand the burner
does not start.
If the anomaly is detected after heat demand, the burner
remains in purge condition.
If the anomaly is detected during running position the burner
remains in operation.
When the anomaly disappears, the burner restarts.
8.8.13
Internal voltage anomaly
The control-box automatically detects if the internal voltage
works correctly. The fault is indicated by means of the blinking
LED (see section 8.8.2).
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 shutdown test the burner
does not start.
If the anomaly is detected during running position the burner
remains in operation.
When the anomaly disappears, the burner restarts.
8.8.14
Reset push-button fault
If the reset push-button breaks or is kept pressed for more than
60 seconds, the fault is indicated by the led that blinks (see
section 8.8.2) as long as the fault is present.
This fault is merely a visualisation.
If the fault is detected during pre-purging or safety time, the
burner does not stop (the start-up sequence will continue).
If the fault is detected during operation, the burner does
stops and stays stopped with the fault signal active.
If the fault is detected during a lockout, the fault is not sig-
nalled and the burner cannot be reset.
When the fault disappears, the LED stops blinking.
8.8.15
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 blinking led (see section 8.8.2).
8.8.16
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 section 8.8.2):
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 anomaly is detected during running position the burner
remains in operation.
The fault is not detected if the burner is in lockout.
8.8.17
EEprom check
The control-box automatically detects if EEprom memory of mi-
crocontroller has failed and will perform a lockout. The lockout is
indicated by blinking led (see section 8.8.2).
8.9
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-purge 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.
