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Benchmark 750-3000 Boiler Installation & Startup Manual
SECTION 5 – SAFETY DEVICE TESTING
5.8 AIR FLOW FAULT TESTS - BLOWER PROOF & BLOCKED
INLET SWITCHES
These tests check the operation of the Blower Proof switch and Blocked Inlet switch shown in
Figure 5-6a and 5-6b.
5.8.1 Blower Proof Switch Test
BLOWER
A/F VALVE
PLENUM
BLOWER
PROOF
SWITCH
AIR/FUEL
VALVE
BLOCKED
INLET
SWITCH
AIR
FILTER
GAS
TRAIN
Figure 5-6a: Bare Boiler – Partial View – BMK 1500 – 3000 Shown
OMM-0121_D • GF-205 • 5/9/2019
IGNITER/
GAS
INLET
BLOWER
PLENUM
Technical Support • (800) 526-0288 • Mon-Fri, 8 am - 5 pm EST
INJECTOR
ASSEMBLY
HEAT
EXCHANGER
MANUAL
SHUT-OFF
VALVE
SSOV
Page 91 of 122
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