14
Gas Supply Pressure Measurement
T
O
PREVENT
UNRELIABLE
OPERATION
OR
EQUIPMENT
DAMAGE
,
THE
I
NLET
GAS
SUPPLY
PRESSURE
MUST
BE
AS
SPECIFIED
ON
THE
UNIT
RATING
PLATE
WITH
ALL
OTHER
HOUSEHOLD
GAS
FIRED
APPLIANCES
OPERATING
.
CAUTION
The line pressure supplied to the gas valve must be within the range
specified in the
Inlet Gas Supply Pressure
table. 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 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 (Single Stage)
Inlet
Pressure Boss
Low Fire
Regulator Adjust
High Fire Regulator
Adjust
Regulator
Vent
Outlet
Pressure Boss
White-Rodgers Model 36G54 (Two Stage)
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. Set the room thermostat to its lowest possible setting.
4. Remove the heat exchanger door on the side of the unit by
removing screws.
5. This unit is equipped with an ignition device which
automatically lights the main burner. DO NOT try to light
burner by any other method.
6. Move the gas control valve switch to the OFF position. Do
not force.
7. Wait five minutes to clear out any gas.
8. Smell for gas, including near the ground. This is important
because some types of gas are heavier than air. If you have
waited five minutes and you do smell gas, immediately follow
the warnings on page 3 of this manual. If having waited for
five minutes and no gas smell is noted, move the gas control
valve switch to the ON position.
9. Replace the heat exchanger door on the side of the unit.
10. Open the manual gas valve external to the unit.
11. Turn on the electrical power supply to the unit.
12. Set the thermostat to desired setting.
Gas Valve
On/Off
Selector
Switch
INLET
OUTLET
White-Rodgers 36G22 (Single Stage)
Inlet
Pressure Boss
Low Fire
Regulator Adjust
High Fire Regulator
Adjust
Regulator
Vent
Outlet
Pressure Boss
White-Rodgers Model 36G54 (Two Stage)
Gas Supply And Manifold Check
Gas supply pressure and manifold pressure with the burners
operating must be as specified on the rating plate.
NOTE:
Use adapter kit #0151K00000S to measure gas pressure on
White-Rodgers 36G22 and 36G54 gas valves.