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Whirlpool WGFD28 Installation Instructions Manual page 22

80% 2-stage variable speed gas furnace gold models
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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 control valve must be within
the range specified below. The supply pressure can be measured
at the gas control valve inlet pressure boss 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.
Gas Control Valve—White-Rodgers 2-Stage 36G54
A
C
A. Inlet
B. Outlet
C. On/Off selector switch
Gas Control Valve—White-Rodgers 36G54 Connected to
Manometer
A
K
L
A. Open to atmosphere
B. Manometer hose
C. Outlet pressure boss
D. High-fire regulator adjust
E. Regulator vent
F. Low-fire regulator adjust
22
Gas Supply Pressure Measurement
B
B
C
D
J
I
H
G
G. Coaxial coil terminal (M)
H. Common terminal (C)
I. High-fire coil terminal (HI)
J. On/Off selector switch
K. Inlet pressure boss
L. Manometer
Gas Control Valve—Honeywell 2-Stage VR9205
A. Regulator vent
B. High-fire regulator adjust
Gas Control Valve—Honeywell VR9205 Connected to
Manometer
H
E
A. Open to atmosphere
B. Manometer hose
C. Common terminal (C)
F
D. High-fire coil terminal (HI)
1. Turn off the gas supply to the furnace at the manual gas
shutoff valve external to the furnace.
2. Disconnect all electrical power to the system.
3. Connect a calibrated water manometer (or appropriate gas
pressure gauge) at either the gas control valve inlet pressure
boss or the gas piping drip leg. See Gas Control Valve—
Honeywell VR9205 Connected to Manometer or Gas Control
Valve—White-Rodgers 36G54 Connected to Manometer for
location of inlet pressure boss/tap.
NOTE: If you are measuring the gas pressure at the drip leg or on
the Honeywell VR9205 gas control valve, a field-supplied hose
barb fitting must be installed prior to making the hose
connection. If using the inlet pressure boss on the White-Rodgers
36G54 gas control valve, then use the 36G Valve Pressure Check
Kit, Part Number 0151K00000S.
4. Turn on the gas supply and operate the furnace and all other
gas consuming appliances on the same gas supply line.
5. Measure the furnace gas supply pressure with burners firing.
NOTE: Supply pressure must be within the range specified in the
Inlet Gas Supply Pressure chart.
A
C
D
C. Low-fire regulator adjust
D. On/Off selector switch
B
A
i
G
E. Low-fire coil terminal (LO)
F. ¹⁄₈ " NPT inlet pressure tap
G. ¹⁄₈ " NPT outlet pressure tap
H. Manometer
B
C
D
E
F

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