Gas Control Valve—Honeywell 2-Stage VR9205
A. Regulator vent
B. High-fire regulator adjust
Gas Control Valve—Honeywell VR9205 Connected to
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/
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.
D. Low-fire regulator adjust
E. On/Off selector switch
E. Low-fire coil terminal (LO)
F. ¹⁄₈ " NPT inlet pressure tap
G. ¹⁄₈ " NPT outlet pressure tap
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.
Inlet Gas Supply Pressure
Minimum: 5.0" W.C. Maximum: 10.0" W.C.
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
7. Disconnect the manometer.
8. Reinstall plug before turning on gas supply to furnace.
9. Turn off any unnecessary gas appliances that were turned on
in Step 4.
Measuring Inlet Gas Pressure—Alternate Method
A. Gas supply line
B. Gas shutoff valve
C. Gas supply line to furnace
D. Open to atmosphere
Gas Manifold Pressure Measurement and
To prevent unreliable operation or equipment damage,
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
1. Turn off the gas supply to furnace at the manual gas shutoff
valve external to the furnace.
2. Turn off all electrical power to the system.
F. Manometer hose
G. Dripleg cap with fitting