Benchmark 2500 - 3000 Boilers
CHAPTER 3 – OPERATION
Page
50
of
207
AERCO International, Inc.
•
100 Oritani Dr.
•
Blauvelt, NY 10913
OMM-0094_0F
09/30/2015
Ph.: 800-526-0288
GF-137
Figure 3-5: Blower Proof Switch
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.
AIR/FUEL VALVE
OUTLET TO BLOWER
BLOCKED
INLET
SWITCH
BLOWER
PROOF
SWITCH
AIR/FUEL VALVE
INLET FROM GAS
TRAIN
