28
4. Measure furnace gas supply pressure with burners firing.
Supply pressure must be within the range specified in the
Inlet Gas Supply Pressure
table.
Propane Gas
Natural Gas
Inlet Gas Supply Pressure
Minimum:5.0" W.C. Maximum :10.0" W.C.
Minimum:11.0" W.C. Maximum :13.0" W.C.
If supply pressure differs from above, make 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
disconnect manometer. Reinstall plug before turning on
gas to furnace.
6. Turn OFF any unnecessary gas appliances started in step
3.
W
HITE
-R
ODGERS
36G22 G
AS
V
ALVE
The line pressure supplied to the gas valve must be within the
range specified in the Inlet Gas Supply Pressure Table. The sup-
ply 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 unit OFF. To measure inlet
pressure, use the following procedure.
Pressure Regulator
Adjustment
(Under Cap Screw)
Gas Valve
On/Off
Selector
Switch
INLET
OUTLET
Inlet Pressure
Tap
Outlet Pressure
Tap
White-Rodgers Model 36G22
1. Turn OFF gas to furnace at the manual gas shutoff valve
external to the furnace.
2. Using 3/32 hex wrench, loosen inlet pressure tap screw
one turn.
3. Connect a 5/16 inch hose and calibrated water manometer
to the gas valve inlet pressure tap. The hose should overlap
the tap by 3/8 inch.
4. Turn ON the gas supply and operate the furnace
5. Leak test. Using a leak detection solution or non-chlorine
soap suds, check for leaks at hose connection. Bubbles
forming indicate a leak. SHUT OFF GAS AND FIX ALL LEAKS
IMMEDIATELY BEFORE PROCEEDING TO NEXT STEP!
6. Measure furnace gas supply pressure. Supply pressure
must be within the range specified in the
Inlet Gas Supply
Pressure
table.
If supply pressure reading differs from the table, make
necessary adjustments to pressure regulator, gas piping
size, etc., and/or consult with local gas utility.
7. Turn OFF gas to furnace at the manual shutoff valve and
disconnect manometer and hose. Reinstall plug before
turning on gas to furnace.
8. Seal pressure port. Tighten inlet pressure tap screw
clockwise 7 in-lbs. minimum.
9. Retest for leaks. If bubbles form, shut down gas and fix
leaks immediately.
10. Turn valve switch ON.
G
AS
M
ANIFOLD
P
RESSURE
M
EASUREMENT
AND
A
DJUSTMENT
CAUTION
T
O PREVENT UNRELIABLE OPERATION OR EQUIPMENT DAMAGE, THE GAS
MANIFOLD PRESSURE MUST BE AS SPECIFIED ON THE UNIT RATING PLATE.
O
NLY MINOR ADJUSTMENTS SHOULD BE MADE BY ADJUSTING THE GAS VALVE
PRESSURE REGULATOR.
W
HITE
-R
ODGERS
36F22 G
AS
V
ALVE
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. Connect a calibrated water manometer (or appropriate gas
pressure gauge) at the gas valve outlet pressure tap (refer
to gas valve figure in previous section).
3. Turn ON the gas supply and operate the furnace.
4. Measure gas manifold pressure with burners firing. Adjust
manifold pressure using the
Manifold Gas Pressure
table
shown.
Manifold Gas Pressure
Natural Gas
3.5" w.c.
Propane Gas
10.0" w.c.
The final manifold pressure must not vary more than ± 0.3 “ w.c.
from the above specified pressures. Any necessary major changes
in gas flow rate should be made by changing the size of the burner
orifice.
5. To adjust the gas valve pressure regulator, remove the
regulator cap.
6. Turn the adjustment screw clockwise to increase the
pressure, or counterclockwise to decrease the pressure.
7. Securely replace the regulator cap.
8. Turn OFF gas to furnace at the manual shutoff valve and
disconnect manometer.
9. Reinstall gas valve outlet pressure tap plug before turning
on gas to furnace.
W
HITE
-R
ODGERS
36G22 G
AS
V
ALVE
This valve is shipped from the factory with the regulator preset (see
control label).
Consult the appliance rating plate to ensure burner manifold pres-
sure is as specified. If another outlet pressure is required, follow
these steps.
1. Turn OFF all electrical power to the system.
2. Using a 3/32 inch hex wrench, loosen outlet pressure tap
screw one turn. Do not remove screw.
3. Connect a calibrated water manometer and 5/16 inch hose
to the gas valve outlet pressure tap. Hose should overlap
tap by 3/8 inch.
4. Turn ON system power and set thermostat to a call for heat.
5. Using a leak detection solution or non-chlorine soap suds,
check for leaks at hose connection. Bubbles forming
indicate a leak. SHUT OFF GAS AND FIX ALL LEAKS
IMMEDIATELY!
6. Remove regulator screw cover. Turn regulator screw either
clockwise to increase pressure or counterclockwise to
decrease. Always adjust regulator to provide the correct
pressure according to the original equipment manufacturer
specifications listed on the appliance rating plate.
