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6.5
Operation sequence of the burner
Normal
Thermostat
Motor
Ignition transformer
Valves
Flame
Lockout
max. 2s
If the flame goes out while running, the burner
goes into lockout within 1 second.
WARNING
6.5.1
Start-up programme visual diagnostics
When operating normally, the various operating statuses can be
see on the control box's LED (reset button) indicated in the form
of a colour code (Tab. H).
Sequences
Pre-purge
Ignition phase
Operation, flame OK
Operation with weak flame signal
Electrical supply below ~ 170V
Lockout
Extraneous light
6.5.2
Normal operation / flame detection time
The control box has a function through which it is possible to as-
certain the correct functioning of the burner (signal: GREEN LED
permanently on).
To use this function, it is necessary to wait at least 10s. from the
time the burner switches on and press the button on the control
box for at least 3 seconds.
Once the button is released, the GREEN LED starts to flash, as
shown in Tab. I.
The pulses of the LED constitute a signal spaced by approxi-
mately 3 seconds.
GREEN LED ON
wait at least 10s
Signal
1 blink
2 blinks
6 blinks
Start-up, calibration and operation of the burner
40s
Press the button
for > 3s
Flame detection time
0.4 s
0.8 s
2.8 s
Tab. J
Lockout due to ignition failure
max. 2s
Colour code
The number of pulses will measure the probe detection time
since the opening of gas valves, according to: Tab. J.
This is updated in every burner start-up.
Once read, the burner repeats the start-up cycle by briefly press-
ing the control box button.
If the result is > 2 s, ignition will be retarded. Then
check the adjustment of the hydraulic brake on the
gas valve, the adjustment of the air damper and
WARNING
the combustion head.
Signal
23
GB
40s
3s
Colour
Yellow
Yellow - Off
Green
Green - On
Yellow - Red
Red
Red - Green
3s interval
D4172
Fig. 21
Tab. H
Signal
Tab. I
20063701
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