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Benchmark 750-3000 Boiler Installation & Startup Manual
SECTION 3 - START SEQUENCE
Start Sequence
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.
c) For the duration of this cycle, the C-More Controller will display the CLEANING
IGNITER message.
d) Following the Spark Element Cleaning Cycle, power is applied to the Gas Safety Shut-
off Valve (SSOV) and the C-More Controller displays the PRE IGNITION message.
When the SSOV indicates the Gas Valve is OPEN (POC), the C-More Controller
displays the IGNITION TRIAL message.
e) If no spark is present 3 seconds into the IGNITION TRIAL, the C-More Controller will
abort the Ignition Cycle and shut down the boiler. Refer to Section 5: Troubleshooting
Guide in the Benchmark 750 – 3000 Operation and Maintenance Guide, OMM-0122
(GF-206) for guidance if this occurs.
TO BLOWER
AIR IN
Figure 3-4: Air/Fuel Valve In Ignition Position
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.
9. Once the demand for heat has been satisfied, the C-More Controller 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-0121_D • GF-205 • 5/9/2019
STEPPER
MOTOR
IGNITION
VALVE POSITION
DIAL AT
25% to 35%
Technical Support • (800) 526-0288 • Mon-Fri, 8 am - 5 pm EST
Page 50 of 122
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