AERCO BMK 6000 Dual Fuel - Manual (Page 53)

Benchmark 6000 DF Installation, Operation & Maintenance Manual
CHAPTER 3 – OPERATION
OMM-0096_0B AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 Page 53 of 219
GF-141
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03/21/2014
5. Upon completion of the purge cycle, the Control Box 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 (Figure 3-6)
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 Optical Pilot Flame Sensor proves 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 3-6: Air/Fuel Valve In Ignition Position
6. When ignition relay 1 (R1) closes, power is supplied to the SSOVs and the following events
occur:
a) The SSOVs open allowing gas to flow into the Air/Fuel Valve.
b) The Main Burner ignites.
c) Main Burner flame is sensed by the C-More Controller.
d) The Control Box turns off power to the ignition transformer and Pilot solenoid valve.
e) Relay 2 (R2) remains energized via the POC Normally Open (N.O.) contact of the
upstream SSOV actuator.
7. A maximum of 7 seconds are allowed for the entire ignition sequence, from applying power
to the ignition transformer through actual Burner flame establishment. The igniter relay will
be turned off one second after flame is detected.
8. After 2 seconds of continuous flame, Flame Proven will be displayed and the flame
strength will be indicated. After 5 seconds, the current date and time will be displayed in
place of the flame strength.
9. With the unit firing properly, it will be controlled by the temperature controller circuitry. The
boiler’s VALVE POSITION will be continuously displayed on the front panel bargraph.
Once the demand for heat has been satisfied, the C-More Controller will turn off the SSOV gas
valves. The blower relay will be deactivated and the Air/Fuel Valve will be closed. Standby will
be displayed.
50
STEPPER
MOTOR
TO BLOWER
AIR IN