Whirlpool WGFD295 Instruction Manual download pdf (Page 29)

Direct/Standard Inlet Piping

When gas piping enters directly to the gas control valve through

the standard inlet hole, the installer must supply straight pipe

with a ground joint union to reach the exterior of the furnace. The

rigid pipe must be long enough to reach the outside of the

cabinet to seal the grommet cabinet penetration. A semirigid

connector to the gas piping can be used outside the cabinet per

local codes.

Indirect/Alternate Inlet Piping

When gas piping enters indirectly to the gas control valve through

the alternate gas inlet hole, the following fittings (starting from the

gas control valve) must be supplied to reach the outside of the

cabinet:

■ Coupling

■ 90º elbow

■ 2" close nipple

■ 90º elbow

■ Straight pipe with a ground joint union to reach the exterior of

the furnace.

NOTE: The rigid pipe must be long enough to reach the outside

of the cabinet so as to seal the grommet cabinet penetration. A

semirigid connector to the gas piping can be used outside the

cabinet per local codes.

Gas Piping Checks

Before placing the furnace in operation, leak test the furnace and

gas connections.

Check for leaks using an approved chloride-free soap and water

solution, an electronic combustible gas detector, or other

approved testing methods.

NOTES:

■ Never exceed specified pressures for testing. Higher pressure

may damage the gas control valve and cause subsequent

overfiring, resulting in heat exchanger failure.

■ Disconnect this unit and external manual shutoff valve from

the gas supply piping system before pressure testing the

supply piping system with pressures in excess of ¹⁄₂ psig

(3.48 kPa).

■ Isolate this unit from the gas supply piping system by closing

the external manual gas shutoff valve before pressure testing

supply piping system with test pressures equal to or less than

¹⁄₂ psig (3.48 kPa).

Propane Gas Tanks and Piping

A gas detecting warning system is the only reliable way to detect

a propane gas leak. Rust can reduce the level of odorant in

propane gas. Do not rely on your sense of smell. Contact a local

propane gas supplier about installing a gas detecting warning

system.

All propane gas equipment must conform to the safety standards

of the National Board of Fire Underwriters, NBFU Manual 58.

For satisfactory operation, propane gas pressure must be 11"

W.C. at the furnace manifold with all gas appliances in operation.

Maintaining proper gas pressure depends on 3 main factors:

■ Vaporization rate, depending on temperature of the liquid and

“wetted surface” area of the container or containers.

■ Proper pressure regulation. 2-stage regulation is

recommended for both cost and efficiency.

■ Pressure drop in the lines between the regulators, and

between 2

stage regulator and the appliance. Pipe size will

depend on the length of the pipe run and the total load of all

appliances.

Complete information regarding tank sizing for vaporization,

recommended regulator settings, and pipe sizing is available

from most regulator manufacturers and propane gas suppliers.

Since propane gas will quickly dissolve white lead and most

standard commercial compounds, special pipe dope must be

used. Shellac-based compounds resistant to the actions of

liquefied petroleum gases, such as Gasolac

, Stalactic

, Clyde’s

or John Crane

are satisfactory.

Refer to “Propane Gas Installation—Typical” for typical propane

gas installations and piping.

Propane Gas Installation—Typical

Goodman 56

Edges of sheet metal holes may be sharp. Use gloves as

a precaution when removing hole plugs.

WARNING

Goodman 63

To avoid the possibility of explosion or fire, never use a

match or open flame to test for leaks.

WARNING

Goodman 72

To prevent property damage or personal injury due to

fire, the following instructions must be performed

regarding gas connections, pressure testing, location

of shutoff valve and installation of gas piping.

WARNING

A. 1

stage regulator

B. 5 to 15 psig (20 psig maximum)

C. 200 psig maximum

D. 2

stage regulator

E. Continuous 11" W.C.

Goodman 64

If the gas furnace is installed in a basement, and

excavated area or a confined space, it is strongly

recommended to contact a propane supplier to install a

gas detecting warning device in case of a gas leak.

— Since propane gas is heavier than air, any leaking can

settle in low areas or confined spaces.

— Propane gas odorant may fade, making the gas

undetectable except with a warning device.

WARNING

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Whirlpool WGFD295 Instruction Manual Page 29

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