Benchmark 750-3000 Boiler Installation & Startup Manual
SECTION 3 - START SEQUENCE
OMM-0121_D • GF-205 • 5/9/2019 Technical Support • (800) 526-0288 • Mon-Fri, 8 am - 5 pm EST Page 49 of 122
Start Sequence
Figure 3-3a: BMK 750 & 1000 Blower Proof Switch
Figure 3-3b: BMK 1500 – 3000 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 (Figure 3-4) will read between 25 and 35
to indicate that the valve is in the low fire position.
AIR/FUEL VALVE
OUTLET TO BLOWER
BLOCKED
INLET
SWITCH
PROOF
SWITCH
AIR/FUEL VALVE
INLET FROM GAS
BLOWER PROOF SWITCH
BLOCKED INLET SWITCH
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