20141254
26
GB
Start-up, calibration and operation of the burner
6.10 Automatic pre-heating deactivation
It is possible to disable the pre-heater function in automatic mode
by pressing the reset button of the control box.
When the pre-heating is disabled, the pre-heating remains off un-
til:
– a lockout occurs
– the main supply voltage is interrupted
– there is a stop due to intermittent operation.
The deactivation of the automatic pre-heating function is not lost
if the switching off test function is active or if the heat request
thermostat opens.
Tab. G
6.11 Post-purge
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 op-
erating cycle starts.
Sequence of pre-heating
deactivation
Colour of the led
of the button
Allow the disabling of the pre-heating
only when there is no lockout or fault
-
Allow the disabling of the pre-heating
using the reset button.
-
Supply the burner and simultaneously
keep pressed the reset button for 3
seconds.
RED
Release the reset button within 3 sec-
onds.
OFF
The burner will start disabling the pre-
heating only if the reset button is re-
leased within 3 seconds.
-
