GAS SUPPLY PRESSURE MEASUREMENT

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.

WHITE-RODGERS 36F22 GAS VALVE

The line pressure supplied to the gas valve must be within the range specified below. 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 (see picture above). To measure the gas supply pressure, use the following procedure.

With Power and Gas Off:

1.Connect a water manometer or adequate gauge to the “inlet pressure tap” of the gas valve.

As an alternative method, inlet gas pressure can also be measured by removing the cap from the drip leg and installing a predrilled cap with a hose fitting.

With Power and Gas On:

2.Put furnace into heating cycle and turn on all other gas consuming appliances.

If operating pressures differ from the Inlet Gas Supply Pressure table below, make necessary pressure regulator adjustments, check piping size, etc., and/or consult with local utility.

Gas Line

Gas

Shutoff

Valve

Gas Line

To Furnace

Open To

Atmosphere

Drip Leg Cap

With Fitting

Manometer Hose

Manometer

Measuring Inlet Gas Pressure (Alternate Method)

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 table.

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 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 before turning on gas to furnace.

6.Turn OFF any unnecessary gas appliances started in step 3.

WHITE-RODGERS 36G22 GAS VALVE

The line pressure supplied to the gas valve must be within the range specified below. 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 unit OFF. To measure inlet pressure, use the following procedure.

Gas Valve

On/Off

Selector

SwitchInlet Pressure

Tap

OUTLET

INLET

Pressure Regulator

Outlet Pressure

Adjustment

Tap

(Under Cap Screw)

 

White-Rodgers Model 36G22

1.Turn OFF gas to furnace at the manual gas shutoff valve external to the furnace.

2.Using 3/32 hex wrench, loosen inlet pressure tap screw one turn.

3.Connect a 5/16 inch hose and calibrated water manometer to the gas valve inlet pressure tap. The hose should overlap the tap by 3/8 inch.

4.Turn ON the gas supply and operate the furnace

5.Leak test. Using a leak detection solution or non-chlorine soap suds, check for leaks at hose connection. Bubbles forming indicate a leak. SHUT OFF GAS AND FIX ALL LEAKS IMMEDIATELY BEFORE PROCEEDING TO NEXT STEP!

6.Measure furnace gas supply pressure. Supply pressure must be within the range specified in the Inlet Gas Supply Pressure table.

If supply pressure reading differs from the table, make necessary adjustments to pressure regulator, gas piping size, etc., and/or consult with local gas utility.

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.

7.Turn OFF gas to furnace at the manual shutoff valve and disconnect manometer and hose. Reinstall plug before turning on gas to furnace.

8.Seal pressure port. Tighten inlet pressure tap screw clockwise 7 in-lbs. minimum.

9.Retest for leaks. If bubbles form, shut down gas and fix leaks immediately.

10.Turn valve switch ON.

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Goodman Mfg GMS8 White-Rodgers Model 36G22, Measuring Inlet Gas Pressure Alternate Method, GAS Supply Pressure Measurement

GMS8, GHS8, GDS8 specifications

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