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Gas Manifold Pressure Measurement And Adjustment - Whirlpool WGFM29 Installation Instructions Manual

93% and 95% 2-stage variable-speed gas furnace
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Gas Control Valve—Honeywell 2-Stage VR9205
F
A. Regulator vent
B. High-fire regulator adjust
C. Outlet
Gas Control Valve—Honeywell VR9205 Connected to
Manometer
B
A
i
H
A. Open to atmosphere
B. Manometer hose
C. Common terminal (C)
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" illustration 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.
34
A
B
C
D
E
D. Low-fire regulator adjust
E. On/Off selector switch
F. Inlet
C
D
E
F
G
E. Low-fire coil terminal (LO)
F. ¹⁄₈ " NPT inlet pressure tap
G. ¹⁄₈ " NPT outlet pressure tap
H. Manometer
NOTE: Supply pressure must be within the range specified in the
Inlet Gas Supply Pressure chart.
Inlet Gas Supply Pressure
Natural Gas
Minimum: 5.0" W.C. Maximum: 10.0" W.C.
Propane Gas
Minimum: 11.0" W.C. Maximum: 13.0" W.C.
If the supply pressure differs from chart, make the necessary
adjustments to the pressure regulator, gas piping size, etc., and/
or consult with local gas utility.
6. Turn off the gas supply to the furnace at the manual shutoff
valve.
7. Disconnect the manometer.
8. Reinstall plug before turning on gas supply to furnace.
9. Turn off any unnecessary gas appliances started in Step 4.
Measuring Inlet Gas Pressure Alternate Method
A
B
G
A. Gas supply line
B. Gas shutoff valve
C. Gas supply line to furnace
D. Open to atmosphere
Gas Manifold Pressure Measurement and
Adjustment
CAUTION
To prevent unreliable operation or equipment damage,
Goodman 65
the gas manifold pressure must be as specified on the
unit rating plate. Only minor adjustments should be made
by adjusting the gas control valve pressure regulator.
Only small variations in gas pressure should be made by
adjusting the gas control 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 the gas supply to the furnace at the manual gas
shutoff valve external to the furnace.
2. Turn off all electrical power to the system.
3. Outlet pressure tap connections:
Honeywell VR9205 valve: Remove the outlet pressure
boss plug. Install an ¹⁄₈" NPT hose barb fitting into the
outlet pressure tap.
White-Rodgers 36G54 valve: Back outlet pressure test
screw (inlet/outlet pressure boss) out one turn
(counterclockwise, not more than one turn).
C
D
F
E
E. Manometer
F. Manometer hose
G. Dripleg cap with fitting

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