27
2.
Connect a calibrated water manometer (or appropriate
gas pressure gauge) at either the gas valve inlet
pressure tap or the gas piping drip leg. See White-
Rodgers
36J22Y-204 gas valve figure for location of inlet
pressure tap.
OUTLET
INLET
Gas Valve ON/OFF Selector Switch
Outlet Pressure
Inlet Pressure
Regulator
Cover Screw
White-Rodgers Model 36J22Y-204
Figure 33A
OUTLET
INLET
White-Rodgers Model 36J22Y-204
Connected to Manometer
Figure 33B
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 adjust-
ments to pressure regulator, gas piping size, etc., and/or con-
sult with local gas utility.
5. Turn OFF gas to furnace at the manual shutoff valve
and disconnect manometer. Reinstall plug before turning
on gas to furnace.
6. Turn OFF any unnecessary gas appliances stated in step
3.
Gas Line
Gas
Shutoff
Valve
Gas Line
To Furnace
Drip Leg Cap
With Fitting
Manometer Hose
Manometer
Open To
Atmosphere
Measuring Inlet Gas Pressure (Alt. Method)
Figure 34
G
AS
M
ANIFOLD
P
RESSURE
M
EASUREMENT
AND
A
DJUSTMENT
Only small variations in gas pressure should be made by adjust-
ing 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. Turn OFF gas to furnace at the manual gas shutoff valve
external to the furnace.
2. Turn off all electrical power to the system.
3. Outlet pressure tap connections:
White-Rodgers 36J22 valve: Back outlet pressure test screw
(inlet/outlet pressure tap) out one turn (counterclockwise,
not more than one turn).
4. Attach a hose and manometer to the outlet pressure tap
(White-Rodgers valve).
5. Turn ON the gas supply.
6. Turn on power and close thermostat “R” and “W” contacts
to provide a call for heat.
7. Measure the gas manifold pressure with burners firing.
Adjust manifold pressure using the
Manifold Gas Pressure
table shown on this page.
8. Remove regulator cover screw from the outlet pressure
regulator adjust tower and turn screw clockwise to increase
pressure or counterclockwise to decrease pressure. Replace
regulator cover screw.
9. Turn off all electrical power and gas supply to the system.
10. Remove the manometer hose from the hose barb fitting
or outlet pressure tap.
11. Replace outlet pressure tap: White-Rodgers 36J22
valve: Turn outlet pressure test screw in to seal pressure
port (clockwise, 7 in-lb minimum).
12. Turn on electrical power and gas supply to the system.
13. Close thermostat contacts “R” and “W” to energize
the valve.