Watts Benchmark Aerco OMM-0122 - 5.8 AIR FLOW FAULT TESTS - BLOWER PROOF & BLOCKED INLET SWITCHES; 5.8.1 Blower Proof Switch Test

Benchmark 750-3000 Boiler Installation & Startup Manual
SECTION 5 – SAFETY DEVICE TESTING
OMM-0121_D • GF-205 • 5/9/2019 Technical Support • (800) 526-0288 • Mon-Fri, 8 am - 5 pm EST Page 91 of 122
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
Figure 5-6a: Bare Boiler – Partial View – BMK 1500 – 3000 Shown
BLOWER
HEAT
EXCHANGER
BLOWER
PROOF
SWITCH
AIR/FUEL
VALVE
BLOCKED
INLET
SWITCH
AIR
FILTER
SSOV
IGNITER/INJECTOR
ASSEMBLY
BLOWER
PLENUM
GAS
INLET
MANUAL
SHUT-OFF
VALVE
GAS
TRAIN
A/F VALVE
PLENUM