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5.9
Burner starting
Operating control closes, the motor starts.
The pump 3)(Fig. 49) draws the fuel from the tank through the
piping 1) and pumps it under pressure for 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 de-energized solenoid valves 8) - 9) - 2) close the passage
to the nozzle.
Air damper and pressure regulator are positioned on MIN out-
put.
Ignition electrode strikes a spark.
Solenoid valves 8) - 9) - 2) open; the fuel passes through the
piping 10) and filter 11), and enters the nozzle.
A part of the fuel is then sprayed out through the nozzle, ignit-
ing when it comes into contact with the spark: flame at a low
output level; the rest of the fuel passes through piping 12 at
the pressure adjusted by the regulator 13, then, through piping
7), it goes back into the tank.
The spark goes out.
The starting cycle ends.
Start-up, calibration and operation of the burner
35
D10157
GB
Fig. 49
20096088
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