Watts Benchmark Aerco OMM-0122 - Page 95

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 95 of 122
Purge Switch Open During Purge Check Instructions
6. The unit should begin its start sequence, then shut down and display PRG SWITCH OPEN
DURING PURGE.
7. Replace the wire on the Purge switch and depress the CLEAR
button. The unit should
restart.
Figure 5-10a: Air/Fuel Valve Cover Location – BMK 1500 – 3000
Figure 5-10b: Air/Fuel Valve Cover Location – BMK 750/1000
AIR/FUEL VALVE COVER
(Rotate Counter-Clock-Wise
to Remove)
AIR/FUEL
VALVE
BLOCKED
INLET
SWITCH
BLOWER PROOF
SWITCH
AIR/FUEL VALVE COVER
(Rotate counter-clockwise to
remove)