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Benchmark 2500DF-3000DF Installation, Operation & Maintenance Manual
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 (Figure 3.6) will read between 25 and
35 to indicate that the valve is in the low fire position.
(b) The "Spark Cycle Time" item in the Factory menu can be set to either 0 Sec, 2 Sec
or 7 Sec to define the duration of the Spark Element Cleaning Cycle. This cycle
turns on the spark transformer to produce a spark (with no gas flowing) to clean the
spark element of moisture or carbon buildup.
For the duration of this cycle, the C-More will display the "CLEANING IGNITER"
message.
(c) Following the Spark Element Cleaning Cycle, power is applied to the Gas Safety
Shut-off Valve (SSOV) and the C-More displays the "PRE IGNITION" message.
When the SSOV indicates the Gas Valve is OPEN (POC), the C-More displays the
"IGNITION TRIAL" message.
(d) If no spark is present 3 seconds into the IGNITION TRIAL, the C-More will abort the
Ignition Cycle and shut down the boiler. Refer to Chapter 8: Troubleshooting for
guidance if this occurs.
TO BLOWER
AIR IN
6.
Up to 4 seconds will be allowed for ignition to be detected. The igniter relay will be turned
off one second after flame is detected.
7.
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.
8.
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 Control Box will turn off the SSOV gas valve. The
blower relay will be deactivated and the Air/Fuel Valve will be closed. Standby will be displayed.
OMM-0099_0A
GF-145
CHAPTER 3 – OPERATION
STEPPER
MOTOR
IGNITION
VALVE POSITION
DIAL AT
25% to 35%
Figure 3-6: Air/Fuel Valve In Ignition Position
AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913
Ph.: 800-526-0288
Page 49 of 234
PR1: 05/21/2014
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