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Whirlpool WFM18 Installation Instructions Manual page 25

80% single-stage multispeed gas furnace

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WARNING
HIGH VOLTAGE!
Disconnect ALL power before servicing.
Multiple power sources may be present.
Failure to do so may cause property damage,
personal injury or death.
Models Using Single-Stage Gas Control Valves
This valve is shipped from the factory with the regulator preset
(see control label).
Consult the appliance rating plate to ensure burner manifold
pressure is as specified. If another outlet pressure is required,
follow thise steps.
1. Turn off the gas supply to furnace at the manual gas shutoff
valve external to the furnace.
2. Disconnect all electrical power to the system.
3. For the Honeywell VR8215 valve, remove the outlet pressure
boss plug. Install an ¹⁄₈" NPT hose barb fitting into the outlet
pressure tap.
4. For the White-Rodgers 36G22 valve, loosen the outlet
pressure test screw (outlet pressure boss) 1 turn
counterclockwise.
NOTE: Be sure to not turn the test screw more than one turn.
5. Attach a hose and manometer to the outlet pressure barb
fitting (Honeywell valve) or outlet pressure boss
(White-Rodgers valve).
6. Turn on the gas supply to the furnace at the manual gas
shutoff valve external to the furnace.
7. Reconnect all electrical power to the system.
8. Close thermostat R and W contacts to provide a call for heat.
9. Using a leak detection solution or soap suds, check for leaks
at the outlet pressure boss plug (Honeywell valve) or test
screw (White-Rodgers valve).
IMPORTANT: Bubbles forming indicate a leak. Turn off the
gas and repair all leaks immediately.
10. Measure the gas manifold pressure with burners firing. Adjust
manifold pressure using the Manifold Gas Supply Pressure
chart.
Manifold Gas Supply Pressure
Natural gas
Propane gas
11. Remove the regulator cover screw from the outlet pressure
regulator adjust tower and turn the screw clockwise to
increase the pressure or counterclockwise to decrease
pressure.
12. Replace regulator cover screw.
13. Disconnect all electrical power and turn off the gas supply to
the system.
14. Remove the manometer hose from the hose barb fitting on
the outlet pressure boss.
15. For the Honeywell VR8215 valve, remove the ¹⁄₈" NPT hose
barb fitting from the outlet pressure tap. Replace the outlet
pressure boss plug and seal with a high quality thread sealer.
16. For the White-Rodgers 36G22 valve, tighten the outlet
pressure test screw to seal pressure port (clockwise, 7 in.-lb
minimum).
3.5" W.C.
10.0" W.C.
17. Turn on the gas supply to the furnace at the manual gas
shutoff valve external to the furnace.
18. Reconnect all electrical power to the system.
19. Close thermostat "R" and "W" contacts to provide a call for
heat.
20. Retest for leaks.
IMPORTANT: Bubbles forming indicate a leak. Turn off the
gas and repair all leaks immediately.
Models Using 2-Stage Gas Control Valves
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 furnace at the manual gas shutoff
valve external to the furnace.
2. Disconnect all electrical power to the system.
3. For the Honeywell VR8215 valve, remove the outlet pressure
boss plug. Install an ¹⁄₈" NPT hose barb fitting into the outlet
pressure tap.
4. For the White-Rodgers 36G22 valve, loosen the outlet
pressure test screw (outlet pressure boss) 1 turn
counterclockwise.
NOTE: Be sure to not turn the test screw more than one turn.
5. Attach a hose and manometer to the outlet pressure barb
fitting (Honeywell valve) or outlet pressure boss
(White-Rodgers valve).
6. Turn on the gas supply to the furnace at the manual gas
shutoff valve external to the furnace.
7. Reconnect all electrical power to the system.
8. Close thermostat R and W1 contacts to provide a call for low-
stage heat.
9. Using a leak detection solution or soap suds, check for leaks
at the outlet pressure boss plug (Honeywell valve) or test
screw (White-Rodgers valve).
IMPORTANT: Bubbles forming indicate a leak. Turn off the
gas and repair all leaks immediately.
10. Measure the gas manifold pressure with burners firing. Adjust
manifold pressure using the Manifold Gas Supply Pressure
chart.
Manifold Gas Supply Pressure
Gas
Rate
Natural
Low Stage
High Stage
Propane
Low Stage
High Stage
11. Remove the regulator cover screw from the low (LO) outlet
pressure regulator adjust tower and turn the screw clockwise
to increase the pressure or counterclockwise to decrease
pressure.
12. Replace regulator cover screw.
13. Close thermostat R and W2 contacts to provide a call for
high-stage heat.
14. Measure the gas manifold pressure with burners firing. Adjust
manifold pressure using the Manifold Gas Supply Pressure
chart.
Range
Nominal
1.6" to 2.2" W.C.
1.9" W.C.
3.2" to 3.8" W.C.
3.5" W.C.
5.7" to 6.3" W.C.
6.0" W.C.
9.7" to 10.3" W.C. 10.0" W.C.
25

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