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BURNER OPERATION
BURNER STARTING (A)
Operating control closes.
The motor starts and the ignition transformer is con-
nected.
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 damp-
er: pre-purging begins with the low fire air delivery.
At the opening of the 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
low fire flame.
If the high fire control device is closed or has been re-
placed by with a jumper wire, the high fire solenoid
valve 11) is opened and the fuel enters the valve 12)
and raises the piston which opens two passages: one
to piping 13), filter 14), and the high fire nozzle, and
the other to the cylinder 15), piston B, that opens the
fan air damper at high fire.
FIRING FAILURE
If the burner does not fire, it goes into lock-out within 5
s of the opening of the low fire solenoid valve.
The flame relay pilot light will light up.
LOCKOUT DURING OPERATION
If the flame goes out during operation, the burner shuts
down automatically within 1 second and automatically
attempts to start again by repeating the starting cycle.
(A)
D2331
12
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