25
SERVICING
WARNING
Disconnect ALL Gas and Electric Power Supply.
1.
After turning off gas to furnace at the manual gas
shutoff valve external to the furnace, remove burner
compartment door to gain access to the gas valve.
2. Connect a calibrated water manometer (or appropri-
ate gas pressure gauge) at either the gas valve inlet
pressure tap or the gas piping drip leg as shown in
the following figures. Refer to
Measuring Gas Pres
-
sure: Single Stage Valves
figure for single stage
valve inlet pressure tap connections.
NOTE: At either location, a hose fitting must be in
-
stalled prior to making the hose connection.
NOTE: Use adapter kit #0151K00000S to measure gas
pressure on White-Rodgers 36J22.
GAS LINE
GAS SHUTOFF VALVE
GAS LINE
TO FURNACE
DRIP LEG CAP
WITH FITTING
MANOMETER HOSE
MANOMETER
OPEN TO
ATMOSPHERE
Measuring Inlet Gas Pressure
(Alternate Method)
3. Turn ON the gas and electrical power 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 following table.
Natural Gas
Minimum: 4.5" w.c.
Maximum: 10.0" w.c.
Propane Gas
Minimum: 11.0" w.c. Maximum: 13.0" w.c.
INLET GAS SUPPLY PRESSURE
If supply pressure differs from above, make necessary ad
-
justments to pressure regulator, gas piping size, etc., and/or
consult with local gas utility.
WARNING
HIGH VOLTAGE
Disconnect ALL power before servicing or in
-
stalling this unit. Multiple power sources may
be present. Failure to do so may cause proper
-
ty damage, personal injury or death.
5.
Disconnect manometer after turning off gas at manu
-
al shutoff valve. Reinstall plug before turning on gas
to furnace.
6. Turn OFF any unnecessary gas appliances started in
step 3.
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 Manifold Pressure Measurement
and Adjustment
CAUTION
To prevent unreliable operation or equipment damage, the
gas manifold pressure must be as a specified on the unit
rating plate. Only minor adjustments should be made by
adjusting the gas valve pressure regulator.
NOTE: 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.
WARNING
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
shutoff valve external to the furnace, remove burner
compartment door to gain access to the gas valve.
2. Connect a calibrated water manometer (or appro-
priate gas pressure gauge) at the gas valve outlet
pressure tap. Refer to Measuring Gas Pressure: Sin
-
gle Stage Valves figure for single stage valve outlet
pressure tap connections.
WARNING
Line Voltage now present.
