Riello PRESS GBV, Инструкции по установке, использованию и обслуживанию, Страница: 31 / 40

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GB
Start-up, calibration and operation of the burner
7.9 Burner operation
7.9.1 Burner starting
• When the control device TL closes, the control box pro-
grammes the starting phase.
The indications for the start-up cycle are given on page 33.
• 0 sec. time:
The control device TL closes.
• After 2 sec.:
The motor starts.
• After 3 sec.:
The ignition transformer is connected. Pre-purging begins with
the max. air delivery.
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 pip-
ing 5) - 7). The screw 6) closes the bypass heading towards
suction and the solenoid valve 8), de-energized, closes the
passage to the nozzle.
• After 25 sec.:
Solenoid valve 8) opens and the fuel passes through the pip-
ing 9) and the filter 10) and is then sprayed out through the
nozzle, igniting when it comes into contact with the spark.
• After 30 sec.:
The ignition transformer switches off.
• After 39 sec.:
The starting cycle comes to an end.
7.9.2 Steady State Operation
When the temperature or pressure increases until control device
TL opens, the burner shuts down.
7.9.3 Firing failure
If the burner does not fire, it goes into lockout within 5 seconds of
the opening of the solenoid valve and 30 seconds after the clos-
ing of control device TL.
The control box pilot light will light up.
7.9.4 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.
7.9.5 Final checks
• Shine a light on the photocell and close the control devices:
the burner should not start.
• Obscure the photocell while the burner is working: the burner
should stop and automatically repeat the starting operation.
• Switch off control device TL while the burner is operating: the
burner should stop.
• Switch off control device TS while the burner is operating: the
burner should stop.
Fill out the information sheet on page 33 before leaving the plant.
Fig. 30
D2707
Fig. 31
D432