GM9S96 Service Manual
SERVICING
39
Gas inlet and manifold pressures should be checked and
adjusted in accordance to the type of fuel being consumed.
The line pressure supplied to the gas valve must be within
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installed in the gas piping drip leg. The supply pressure must
be measured with the burners operating. To measure the
gas supply pressure, use the following procedure.
WARNING
1. -
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partment door to gain access to the gas valve.
2. Connect a calibrated manometer (or appropriate gas
pressure gauge) at either the gas valve inlet pressure
tap or the gas piping drip leg as shown in the following
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or to making the hose connection.
Use adapter kit #0151K00000S to measure gas
pressure on White-Rodgers 36G22 gas valves.
.
3. Turn ON the gas and electrical power supply and op-
erate the furnace and all other gas consuming appli-
ances on the same gas supply line.
4. Measure furnace gas supply pressure with burners
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Natural Gas Minimum: 4.5" w.c. Maximum: 10.0" w.c.
Propane Gas Minimum: 11.0" w.c.
Maximum: 13.0" w.c.
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justments to pressure regulator, gas piping size, etc., and/or
consult with local gas utility.
WARNING
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5.
furnace.
6. Turn OFF any unnecessary gas appliances started in
step 3.
7. Turn on gas to furnace and check for leaks. If leaks
are found, repair and then reinstall burner compart-
ment door.
8. Turn on electrical power and verify proper unit
operation.
Use adapter kit #0151K00000S to measure gas
pressure on White-Rodgers 36J22 gas valves.
Only small variations in gas pressure should be made by
adjusting the gas valve pressure regulator. The manifold
pressure must be measured with the burners operating. To
measure and adjust the manifold pressure, use the following
procedure.