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Furnace Shutdown
1. Set the thermostat to the lowest setting. The
integrated control will close the gas valve and
extinguish flame. Following a 15 second delay, the
induced draft blower will be de-energized. After
the blower off delay time expires, the blower de-
energizes.
2. Remove the burner compartment door and move
the furnace gas valve manual control to the OFF
position.
3. Close the manual gas shutoff valve external to the
furnace.
4. Replace the burner compartment door.
GAS SUPPLY PRESSURE MEASUREMENT
Gas Pressure Test
The line pressure supplied to the gas valve must be within
the range specified below. The supply pressure can be
measured at the gas valve inlet pressure tap or at a hose
fitting 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.
1. Turn OFF gas to furnace at the manual gas shutoff
valve external to the furnace.
2. Connect a calibrated manometer (or appropriate gas
pressure gauge) at either the gas valve inlet pressure
tap or the gas piping drip leg. See White-Rodgers
36J22 gas valve figure for location of inlet pressure
tap.
Gas Valve ON/OFF Selector Switch
OUTLET
Regulator
Outlet Pressure
Cover Screw
White-Rodgers Model 36J22
Figure 48
NOTE: If measuring gas pressure at the drip leg, a
field-supplied hose barb fitting must be installed
prior to making the hose connection. If using the inlet
pressure tap on the White-Rodgers 36J22 gas valve,
then use the 36G/J Valve Pressure Check Kit, Part No.
0151K00000S.
3. Turn ON the gas supply and operate the furnace and
all other gas consuming appliances on the same gas
supply line.
4. Measure furnace gas supply pressure with burners
firing. Supply pressure must be within the range
specified in the Inlet Gas Supply Pressure table.
If supply pressure differs from table, make the necessary
adjustments to pressure regulator, gas piping size, etc.,
and/or consult with local gas utility.
5. Turn OFF gas to furnace at the manual shutoff valve and
6. Turn OFF any unnecessary gas appliances stated in step
Measuring Inlet Gas Pressure (Alt. Method)
Inlet Pressure
Gas Manifold Pressure Measurement and
Adjustment
Only small variations in gas pressure should be made by
adjusting the gas valve pressure regulator. The manifold
INLET
pressure must be measured with the burners operating.
To measure and adjust the manifold pressure, use the
following procedure.
1. Turn OFF gas to furnace at the manual gas shutoff valve
2. Turn off all electrical power to the system.
3. Outlet pressure tap connections:
4. Attach a hose and manometer to the outlet pressure tap
5. Turn ON the gas supply.
6. Turn on power and close thermostat "R" and "W"
7. Measure the gas manifold pressure with burners
37
Manifold Gas Pressure
Gas
Range
Natural
3.2 - 3.8" w.c.
Propane
9.7 - 10.3" w.c.
disconnect manometer. Reinstall plug before turning on
gas to furnace.
3.
Figure 49
external to the furnace.
White-Rodgers 36J22 valve: Back outlet pressure
test screw (inlet/outlet pressure tap) out one turn
(counterclockwise, not more than one turn).
(White-Rodgers valve).
contacts to provide a call for heat.
firing. Adjust manifold pressure using the Manifold
Gas Pressure table shown on this page.
Nominal
3.5" w.c.
10.0" w.c.
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