Watts Benchmark Aerco OMM-0122 - Page 83

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 83 of 122
HIGH Gas Pressure Test Instructions: BMK 750 – 2500
11. Press the CLEAR button on the C-More Controller to clear the fault.
12. The fault message should clear and the FAULT indicator should go off. The unit should
restart (if in MANUAL mode).
13. Upon test completion, close the ball valve and remove the manometer. Replace the 1/4"
NPT plug removed in step 2.
Figure 5-3a: BMK 750/1000 HIGH Gas Pressure Test Components
Figure 5-3b: BMK 1500/2000: HIGH Gas Pressure Fault Test
SSOV
GAS INLET
TO AIR/FUEL
VALVE
HIGH GAS PRESSURE
BALL VALVE
1/4” NTP PLUG
(Install manometer here
for High Gas Pressure
Test)
MANUAL SHUT-OFF
VALVE
HIGH GAS
PRESSURE SWITCH
LOW GAS
PRESSURE SWITCH
HIGH GAS BALL VALVE
1/4" NPT PLUG
(Install manometer here
for HIGH gas pressure
fault test)
NATURAL GAS
INLET
SSOV
TO
AIR/FUEL
VALVE
HIGH GAS
PRESSURE
SWITCH
LOW GAS
PRESSURE
SWITCH
MANUAL
SHUT-OFF
VALVE