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AM Series Boiler & Water Heater User Manual
CHAPTER 8 – UNIT START-UP
8.6 Gas Supply Pressure Test
DO NOT adjust or attempt to measure gas valve outlet pressure. The gas valve is factory-set for
the correct outlet pressure. This setting is suitable for natural gas and propane, requiring no field
adjustment. Attempting to alter or measure the gas valve outlet pressure could result in damage
to the gas valve.
Check the gas supply pressure by following the steps below:
1.
Close the manual gas shut-off valve (Figure 7-1).
2.
Remove the front cover (Figure 10-1).
Turn the screw in pressure port "D" shown in Figure 8-2 three turns counterclockwise.
3.
Connect a manometer with graduations of at least 0.1" W.C. (0.25 mbar) to the inlet gas port
4.
"D" shown in Figure 8-2 (on unit model 399 to 1000, choose the pressure port "D" from any
gas valve present).
5.
Open the manual gas shut off valve (Figure 7-1).
Check that the gas supply pressure does not exceed 13" W.C. If the gas supply pressure is
6.
higher than 13" W.C., adjust the upstream gas pressure regulator to bring the gas supply
pressure between 12" W.C. and 13" W.C.
7.
Turn the power switch to ON.
OMM-0100_E • GF-146 • 11/15/2019
Gas Supply Pressure Test
Figure 8-2: Gas Valve
Technical Support • (800) 526-0288 • Mon-Fri, 8 am - 5 pm EST
NOTE:
Never
force
the
pressure
connection screw or the gas
valve will be damaged!
Page 98 of 170
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