GM9S80 Service Manual
SERVICING
37
e. Measure the gas manifold pressure with burn-
Manifold Gas Pressure table shown below.
f. Remove regulator cover screw from the outlet
pressure regulator adjust tower and turn screw
clockwise to increase pressure or counterclock-
wise to decrease pressure. Replace regulator
cover screw.
g.
the system.
h. Remove the manometer hose from the hose
i. Turn outlet pressure test screw in to seal pres-
sure port (clockwise, 7 in-lb minimum).
6. Honeywell VR8215 Valve
a. Remove the outlet pressure boss plug. Install
pressure tap.
b. Attach a hose and manometer to the outlet
c. Turn ON the gas supply.
d.
e. Measure the gas manifold pressure with burn-
Manifold Gas Pressure table shown below.
f. Remove regulator cover screw from the outlet
pressure regulator adjust tower and turn screw
clockwise to increase pressure or counterclock-
wise to decrease pressure. Replace regulator
cover screw.
g.
the system.
h. Remove the manometer hose from the hose
i.
outlet pressure tap. Replace the outlet pressure
boss plug and seal with a high quality thread
sealer.
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.
1. -
-
partment door to gain access to the gas valve.
2. Connect a calibrated manometer (or appropriate gas
pressure gauge) at the gas valve outlet pressure
tap. Refer to Measuring Gas Pressure: Single Stage
Valves
connections.
3. Turn ON the gas and electrical power supply and op-
erate the furnace.
4.
Adjust manifold pressure using the table below.
3.5" w.c.
10.0" w.c.
-
5. White-Rodgers 36G22 Valves:
a. Back outlet pressure test screw (inlet/outlet
pressure boss) out one turn (counterclockwise,
not more than one turn).
b. Attach a hose and manometer to the outlet
pressure outlet pressure boss.
c. Turn ON the gas supply.
d.
heat.