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Benchmark 750-3000 Boiler Installation & Startup Manual
SECTION 3 - START SEQUENCE
When there is a demand for heat, the following events will occur:
Start Sequence
1. The DEMAND LED status indicator will light.
2. The unit checks to ensure that the Proof of Closure (POC) switch in the downstream Safety
Shut-Off Valve (SSOV) is closed. See Figure 3-1a through 3-1d for SSOV location.
NATURAL
GAS INLET
Figure 3-1a: BMK 750 & 1000 SSOV Location
MANUAL
SHUT-OFF
VALVE
Figure 3-1b: BMK 1500 & 2000 SSOV Location
OMM-0121_D • GF-205 • 5/9/2019
LOW GAS
PRESSURE
SWITCH
TO
AIR/FUEL
VALVE
SSOV
Technical Support • (800) 526-0288 • Mon-Fri, 8 am - 5 pm EST
TO AIR/FUEL
VALVE
MANUAL
SHUT-OFF VALVE
SSOV
NATURAL
GAS INLET
HIGH GAS
PRESSURE
SWITCH
LOW GAS
PRESSURE
SWITCH
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