Goodman Mfg VC8 User Manual download pdf (Page 20)

UPPLY

AND

IPING

• Install a manual shutoff valve between the gas meter

and unit within six feet of the unit. If a union is installed,

the union must be downstream of the manual shutoff

valve, between the shutoff valve and the furnace.

• Tighten all joints securely.

• Connect the furnace to the building piping by one of

the following methods:

– Rigid metallic pipe and fittings.

– Semi-rigid metallic tubing and metallic fittings.

Aluminum alloy tubing must not be used in exterior

locations.

– Use listed gas appliance connectors in accordance

with their instructions. Connectors must be fully in

the same room as the furnace.

– Protect connectors and semi-rigid tubing against

physical and thermal damage when installed.

Ensure aluminum-alloy tubing and connectors are

coated to protect against external corrosion when

in contact with masonry, plaster, or insulation, or

subjected to repeated wetting by liquids such as

water (except rain water), detergents, or sewage.

Drip Leg

Ground Joint Pipe Union

To Be Installed Ahead of

Gas Valve

Reducing Coupling

1/2” x 1/8” with 1/8”

Pipe Plug to Measure

Line Gas Pressure

Height Required

By Local Code

Location of Manual Valve

(Installed Ahead of

Ground Joint Pipe Union)

General Furnace Layout

UPFLOW I NSTALLATIONS

When the gas piping enters through the right side of the fur-

nace, the installer must supply the following fittings (starting

from the gas valve):

• Close nipple.

• 90 degree elbows.

• Straight pipe to reach the exterior of the furnace .

A ground joint union, drip leg, and manual shutoff valve must

also be supplied by the installer. In some cases, the installer

may also need to supply a transition piece from 1/2" to another

pipe size.

When the gas piping enters through the left side of the furnace,

the installer must supply the following fittings (starting from the

gas valve):

• 90 degree elbow.

• Straight pipe to reach the exterior of the furnace.

• A ground joint union, drip leg, and manual shutoff valve

must also be supplied by the installer. In some cases,

the installer may also need to supply a transition piece

from 1/2 inch to another pipe size.

COUNTERFLOW I NSTALLATIONS

When the gas piping enters through the left side of the furnace,

the installer must supply a straight pipe and a 90 degree elbow

to reach the exterior of the furnace.

A ground joint union, drip leg and manual shutoff valve must

also be supplied by the installer. In most cases, the installer

may also need to supply a transition piece from ½” to another

pipe size. When the gas piping enters through the right side of

the furnace, the installer must supply the following fittings (start-

ing at the gas valve):

• Close Nipple

• 90 Degree Elbow

• Straight Pipe to Reach Exterior of Furnace.

GAS P IPING C HECKS

Before placing unit in operation, leak test the unit and gas con-

nections.



AVOID



THE



POSSIBILITY



EXPLOSION



FIRE

,

NEVER



USE



MATCH



OPEN



FLAME



TEST



FOR



LEA KS

WARNING

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

ter solution, an electronic combustible gas detector, or other

approved testing methods.

NOTE: Never exceed specified pressures for testing. Higher

pressure may damage the gas valve and cause subsequent

overfiring, resulting in heat exchanger failure.

Disconnect this unit and shutoff valve from the gas supply pip-

ing system before pressure testing the supply piping system

with pressures in excess of 1/2 psig (3.48 kPa).

This unit must be isolated from the gas supply system by clos-

ing its manual shutoff valve before pressure testing of gas sup-

ply piping system with test pressures equal to or less than 1/2

psig (3.48 kPa).

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Goodman Mfg VC8 User Manual Page 20

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