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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
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 to the suction side of the pump and the so-
lenoid valves 8) - 11) - 16), de-energized, close the
flow to the nozzles.
The hydraulic cylinder 15), piston A, opens the air
damper: pre-purging begins with the low fire air deliv-
ery.
At the opening of the solenoid valves 8) and 16) 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, the 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 for 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 safeguard indicator 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)
D2288
12
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