32
AIR FLOW
SIDE RETURN
EXTERNAL FILTER
RACK KIT
(EITHER SIDE)
Possible Upright Upflow
Figure 48
Horizontal Installations
Filters must be installed in either the central return register
or in the return air duct work.
Gas Supply Pressure Measurement
Gas Pressure Test
CAUTION
To prevent unreliable operation or equipment damage, the
inlet gas supply pressure must be as specified on the unit
rating plate with all other household gas fired appliances
operating.
The line pressure supplied to the gas valve must be within
the range specified on Table 7 on page 27. 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. Back inlet pressure test
port screw turn counter clockwise, not more than one
turn.
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
36J22Y-204 gas valve figure below for location of inlet
pressure tap.
.
Regulator Cover
Screw
White-Rodgers Model 36J22Y-204 Connected to Manometer
Figure 49
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 7, on
page 28.
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 disconnect manometer. Reinstall plug and tighten
as needed before turning on gas to furnace.
6. Turn OFF any unnecessary gas appliances stated in
step 3.
