25
20063754
GB
Start-up, calibration and operation of the burner
6.9
Additional, programmable control box functions
6.9.1
Post-purging function (t6)
Post-ventilation is a function that maintains air ventilation even
after the burner is switched off. The switching off of the burner
comes about when the limit thermostat (TL) opens, with the con-
sequent interruption of the supply of fuel of the valves. To use this
function the reset button must be pressed when the limit thermo-
stat is not switched over (burner switched off).
The post-purging time can be set for a maximum of 6 minutes,
proceeding as follows:
press the reset button for at least 5 seconds, until the signal-
ling LED turns red.
Set the desired time by pressing the button repeatedly: once
= post-ventilation for 1 minute.
after 5 seconds the control box will automatically indicate the
minutes set, via the blinks of the red LED: 1 blink = post-
purging for 1 minute.
To reset this function, simply press and hold the button for 5 sec-
onds until the LED indicator goes red and release it without per-
forming any operation, then wait for at least 20 seconds to allow
the burner to restart.
If during post-ventilation there is a new request for heat, post-
ventilation time is halted and a new operating cycle starts when
the limit thermostat (TL) switches over.
The control box leaves the factory with the following setting: 0
minutes = no post-purging.
6.9.2
Continuous purging function (only for
applications in which this is provided for)
Continuous purging is a function that maintains the air ventilation
independently of the request for burner ignition.
From the moment when it is set, the motor remains in operation
both when the limit thermostat (TL) is not switched over (burner
switched off), and when the burner is in lockout.
On the switch-over of the limit thermostat (TL) the motor stops for
a waiting time of 4 seconds (waiting position = t2 + t1), there is a
subsequent check of the air pressure switch and the start of a
new operational cycle for the burner.
The function can be set via the reset button when the limit ther-
mostat (TL) is not switched over (burner switched off), following
the procedure of the “post-purging function” paragraph and
pressing the button 7 times = continuous purging.
To reset this function, simply press and hold the button for 5 sec-
onds until the LED indicator goes red and release it without per-
forming any operation, then wait for at least 20 seconds to allow
the burner to restart.
The control box leaves the factory with the following setting: 0
minutes = no continuous post-purging.
6.9.3
Function setting procedure using the reset button
Tab. I
6.10
Visual diagnostics of the control box
The control box supplied features a diagnostics function through
which any causes of malfunctioning can be identified (indicator:
red LED).
In order to be able to use this function, press and hold the reset
button for at least 3 seconds from when the appliance is made
safe (lockout).
The control box sends a sequence of pulses that are repeated at
2-second intervals.
Control box function
Actions on the reset button
Status of possible use of the reset button
Reset
1 - 2 seconds
After lockout of control box
Visual diagnostic of the lockout causes
3 seconds
After lockout of control box
Post-purging
5 seconds, then press
1 time = 1 minute
With limit thermostat (TL) not switched
(burner off)
Continuous purging
(only for suitable applications)
5 seconds, then press
7 times = continuous purging
With limit thermostat (TL) not switched
(burner off)
Resetting set functions
5 seconds
With limit thermostat (TL) not switched
(burner off)
Reset of operational parameters
5 seconds
With limit thermostat (TL) switched over
during pre-purging
RED LED ON - press the release button for 3s
Blinks
2s interval
Blinks
