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SERVICING
HIGH VOLTAGE
Disconnect ALL electrical power and shut off gas supply
before servicing or installing.
1. After turning off gas to furnace at the manual gas shut-
off valve external to the furnace, remove burner com-
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 figure for single stage valve outlet pressure tap
connections.
Line Voltage now present.
3. Turn ON the gas and electrical power supply and op-
erate the furnace.
4. Measure gas manifold pressure with burners firing.
Adjust manifold pressure using the table below.
Manifold Gas Pressure
Natural Gas
Propane Gas
The final manifold pressure must not vary more than ± 0.3"'
w.c. from the above specified pressures. Any necessary ma-
jor changes in gas flow rate should be made by changing the
size of the burner orifice.
5. White-Rodgers 36J22 Valves:
a. Back outlet pressure test screw (inlet/outlet pres-
sure boss) out one turn (counterclockwise, not
more than one turn).
b. Attach a hose and manometer to the outlet pres-
sure outlet pressure boss.
c. Turn ON the gas supply.
d. Turn on power and close thermostat "R" and "W1"
contacts to provide a call for heat.
e. Measure the gas manifold pressure with burners
firing. Adjust manifold pressure using the 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. Turn off all electrical power and gas supply to the
system.
h. Remove the manometer hose from the hose barb
fitting or outlet pressure boss.
i. Turn outlet pressure test screw in to seal pressure
port (clockwise, 7 in-lb minimum).
40
WARNING
WARNING
3.5" w.c.
10.0" w.c.
6. Honeywell VR8215 Valve:
a. Remove the outlet pressure boss plug. Install an
1/8" NPT hose barb fitting into the outlet pressure
tap.
b. Attach a hose and manometer to the outlet pres-
sure barb fitting.
c. Turn ON the gas supply.
d. Turn on power and close thermostat "R" and "W1"
contacts to provide a call for low stage heat.
e. Measure the gas manifold pressure with burners
firing. Adjust manifold pressure using the Manifold
Gas Pressure table shown.
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. Turn off all electrical power and gas supply to the
system.
h. Remove the manometer hose from the hose barb
fitting or outlet pressure boss.
i. Remove the 1/8" NPT hose barb fitting from the out-
let pressure tap. Replace the outlet pressure boss
plug and seal with a high quality thread sealer.
HIGH VOLTAGE
Disconnect ALL power and shut off gas supply
before servicing or installing this unit. Multi-
ple power sources may be present. Failure to
do so may cause property damage, personal
injury or death.
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.
Gas Valve
On/Off
Selector
Switch
OUTLET
Pressure Regulator
Adjustment
(Under Cap Screw)
White-Rodgers Model 36J22 (Single-Stage)
WARNING
Inlet Pressure
Tap
INLET
Outlet Pressure
Tap
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