Watts Aerco Benchmark OMM-0116 Installation And Start-Up Manual page 81

Benchmark 750-3000 Installation & Startup Manual
SECTION 5 – SAFETY DEVICE TESTING
LOW Gas Pressure Test Instructions: BMK 3000 Only
7. Press the MENU key on the front panel of the C-More Controller and access the Setup
menu, enter the password 6817 and then press the ENTER key.
8. Place the unit in MANUAL mode and adjust the Air/Fuel Valve position (% open) to 100%.
9. While the unit is firing, read the CO value on the combustion analyzer and slowly decrease
the incoming gas supply pressure until the CO reading is approximately 300 ppm.
10. Take a reading of the inlet gas pressure. If the inlet pressure is below the minimum
calculated in step 4, above, then increase the pressure to match the calculated minimum.
11. Slowly turn the indicator dial on the Low Gas Pressure switch until the unit shuts down due
to a gas pressure fault.
12. Readjust the inlet gas pressure to what it was prior to the test.
13. Press the CLEAR button on the C-More Controller to clear the fault.
14. The fault message should clear and the FAULT indicator should go off. The unit should
now restart.
MANUAL SHUT-
OFF VALVE
LOW Gas
Pressure Port
Install manometer here for
Low Gas Pressure test
Figure 5-2: BMK 3000 LOW and HIGH Gas Pressure Test Components
• •
OMM-115_D GF-200 5/9/2019
TO
AIR/FUEL
VALVE
HIGH GAS
PRESSURE
SWITCH
Technical Support • (800) 526-0288 • Mon-Fri, 8 am - 5 pm EST
126
NATURAL
SSOV
GAS INLET
LOW GAS
PRESSURE
SWITCH
Alternative
LOW Gas
Pressure Port
(P/N 22171 shown)
LOW GAS
BALL VALVE
Page 81 of