Watts AERCO Benchmark OMM-0136 - Page 63

Benchmark Platinum-Edge [II]: Operation-Service Manual
SECTION 5 – SAFETY DEVICE TESTING
OMM-0137_E • GF-211 • 12/13/2019 Technical Support • (800) 526-0288 • Mon-Fri, 8 am - 5 pm EST Page 63 of 153
HIGH Gas Pressure Test Instructions: BMK750 – 2500
14. Upon test completion, close the ball valve and remove the manometer. Replace the 1/4"
NPT plug removed in step 2.
Figure 5-3a: BMK750/1000 HIGH Gas Pressure Test Components
Figure 5-3b: BMK1500/2000: 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
(P/N 22322 shown)
(P/N 22314 shown)