19
6074
GB
Burner calibration
7.2.1
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) sucks the fuel from the tank through the piping
1) and the filter 2) and pumps it under pressure to delivery.
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) - 16), de-
energized, close the passage to the nozzles.
The hydraulic cylinder 15), piston A, opens the air gate
valve: pre-purging begins with the 1st stage air delivery.
22 s:
Solenoid valves 8) and 16) open and the fuel passes
through the piping 9) and filter 10) and is then sprayed out
through the nozzle, igniting when it comes into contact with
the spark. This is the 1st stage flame.
29 s:
The ignition transformer switches off.
36 s:
If the control device TR is closed or has been replaced
by a jumper wire, the 2nd stage solenoid valve 11), ener-
gized, opens two passages: one to piping 12), filter 13), and
the 2nd stage nozzle, and the other to the cylinder 15), pis-
ton B, that opens the fan air gate valve in the 2nd stage.
The starting cycle comes to an end.
TL
TR
0
1°
2°
A
A
TL
D3281
D3280
LED
RMO
*
LED
RMO
*
Fig. 22
Off
Yellow
Green
Red
For further details see pag. 23.
*
Fig. 23
D1253
