Watts Benchmark Aerco OMM-0122 - Page 79

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 79 of 122
LOW Gas Pressure Test Instructions: BMK 750 – 2500
Figure 5-1a: BMK 750/1000 LOW Gas Pressure Test Components
Figure 5-1b: BMK 1500/2000 LOW Gas Pressure Test Components
SSOV
GAS INLET
TO AIR/FUEL
VALVE
LOW GAS PRESSURE
LEAK DETECTION BALL VALVE
(shown closed)
HIGH GAS PRESSURE
SWITCH
LOW GAS PRESSURE SWITCH
MANUAL SHUT-OFF
VALVE
1/4” NPT PLUG
Install manometer
here for LOW gas
pressure fault test
NATURAL
GAS INLET
SSOV
HIGH GAS
PRESSURE
SWITCH
LOW GAS
PRESSURE
SWITCH
MANUAL
SHUT-OFF
VALVE
1/4” NPT PLUG
Install manometer here for LOW gas pressure fault test.
LOW GAS BALL VALVE
TO
AIR/FUEL
VALVE