Watts Benchmark Aerco OMM-0122 - Page 96

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 96 of 122
Purge Switch Open During Purge Check Instructions
Figure 5-11a: Air/Fuel Purge and Ignition Locations– BMK 1500 – 3000
Figure 5-11b: Air/Fuel Purge and Ignition Locations– BMK 750/1000
Purge Position
Switch
AIR IN
VALVE
POSITION DIAL
AIR/FUEL VALVE
SWITCH WIRING
BREAKOUT
172
171
170
169
Ignition Position
Switch
TO BLOWER
Ignition Position Switch
Purge Position Switch
AIR IN
TO BLOWER