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8.3
Burner operation
8.3.1
Burner starting
Starting phases with progressive time intervals shown in sec-
onds:
•
control device TL closes.
After about 3s:
•
0 s : the control box starting cycle begins.
•
2 s : the fan motor starts.
•
3 s : the ignition transformer is connected.
The pump 3)(Fig. 26) sucks the fuel from the tank through the
piping 1) and the filter 2) and pumps it under pressure to de-
livery. The piston 4) rises and the fuel returns to the tank
through the piping 5) - 7).
The screw 6) closes the by-pass heading towards suction
and the solenoid valves 8) - 11), de-energized, close the pas-
sage to the nozzles.
Prepurging begins with the max. air delivery.
•
22 s : the solenoid valve 8) opens and the fuel passes
through the piping 9) and filter 10) and is then sprayed out
through the 1st nozzle, igniting when it comes into contact
with the spark.
This is the ignition flame.
•
29 s : the ignition transformer switches off.
•
36 s : the solenoid valve 11) opens, the fuel passes through
the piping 13) and filter 14) and is then sprayed out through
the 2nd nozzle. This is the operating flame .
The starting cycle comes to an end.
8.3.2
Steady state operation
When the boiler temperature or pressure increases until control
device TL opens, the burner shuts down.
8.3.3
Firing failure
If the burner does not fire, it goes into lock-out within 5 s of the
opening of the 1st nozzle valve and 30 s after the closing of con-
trol device TL. The control box red pilot light will light up.
8.3.4
Undesired shutdown during operation
If the flame goes out during operation, the burner shuts down au-
tomatically within 1 second and automatically attempts to start
again by repeating the starting cycle.
6426
Start-up, calibration and operation of the burner
D601
Fig. 26
LED *
LED *
*
Off
For further details see page 28.
24
GB
Yellow
Green
D3262
Fig. 27
D3268
Fig. 28
Red
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