Benchmark 5000-6000 Boiler Installation & Startup Manual
SECTION 3:
START SEQUENCE
OMM-0123_E
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of
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Start Sequence
4. Next, the blower proof switch on the Air/Fuel Valve (Figure 3-3) closes. The display will
show
PURGING
and indicate the elapsed time of the purge cycle in seconds.
Figure 3-3: Blower Proof Switch
5. Upon completion of the purge cycle, the C-More Controller initiates an ignition cycle and
the following events occur:
a. The Air/Fuel Valve rotates to the low-fire (Ignition Position) position and closes the
ignition switch. The dial on the Air/Fuel Valve will read between
45
and
50
(see
Figure 3-4) to indicate that the valve is in the low-fire position.
b. Power is supplied to the Spark Igniter.
c. Power is supplied to the Pilot Gas Solenoid.
d. The Pilot Flame Detectors prove the Pilot Flame and the red LED stops blinking and
changes to steady ON.
e. Ignition relay 1 (R1) closes allowing the main Burner ignition sequence to start.
Figure 3-4: Air/Fuel Valve in Ignition Position
BLOCKED INLET
SWITCH
BLOWER PROOF
SWITCH
AIR/FUEL VALVE
ASSEMBLY
MANUAL SHUT-
OFF VALVE
BLOWER
STEPPER
MOTOR
TO BLOWER
AIR IN
