Goodman Mfg GHS8 General Furnace Layout, GAS Piping Connections General, Upflow Installations

This unit is configured for natural gas. The appropriate manufacturer’s propane gas conversion kit, must be applied for propane gas installations. Refer to the “Propane Gas and/or High Altitude Installations” section for details.

Contact your distributor for a tabular listing of appropriate manufacturer’s kits for propane gas and/or high altitude installations. The indicated kits must be used to insure safe and proper furnace operation. All conversions must be performed by a qualified installer, or service agency.

GAS PIPING CONNECTIONS

GENERAL

CAUTION

TO AVOID POSSIBLE UNSATISFACTORY OPERATION OR EQUIPMENT DAMAGE DUE TO UNDERFIRING OF EQUIPMENT, USE THE PROPER SIZE OF NATURAL/PROPANE GAS PIPING NEEDED WHEN RUNNING PIPE FROM THE METER/TANK TO THE FURNACE.

When sizing a trunk line, be sure to include all appliances which will operate simultaneously when sizing a trunk line.

The gas piping supplying the furnace must be properly sized based on the gas flow required, specific gravity of the gas, and length of the run. The gas line installation must comply with local codes, or in their absence, with the latest edition of the National Fuel Gas Code, NFPA 54/ANSI Z223.1.

Natural Gas Capacity of Pipe

In Cubic Feet of Gas Per Hour (CFH)

Length of			Nominal Black Pipe Size
Pipe in Feet		1/2"	3/4"	1"	1 1/4"	1 1/2"
	10	132	278	520	1050	1600
	20	92	190	350	730	1100
	30	73	152	285	590	980
	40	63	130	245	500	760
	50	56	115	215	440	670
	60	50	105	195	400	610
	70	46	96	180	370	560
	80	43	90	170	350	530
	90	40	84	160	320	490
100		38	79	150	305	460
(Pressure 0.5 psig or less and pressure drop of 0.3" W.C.; Based on
0.60 Specific Gravity Gas)
CFH =	BTUH Furnace Input
	Heating Value of Gas (BTU/Cubic Foot)

•Use two pipe wrenches when making connection to the gas valve to keep it from turning. The orientation of the gas valve on the manifold must be maintained as shipped from the factory.

•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.

Location of Manual Valve

(Installed Ahead of Ground

Joint Pipe Union)

Height Required

By Local Code

Ground Joint Pipe Union

To Be Installed Ahead Of

Gas Valve

Drip Leg ``

Reducing Coupling 1/2" x 1/8" with 1/8" Pipe Plug To Measure Line Gas Pressure

To connect the furnace to the building’s gas piping, the installer must supply a ground joint union, drip leg, manual shutoff valve, and line and fittings to connect to gas valve. In some cases, the installer may also need to supply a transition piece from 1/2" pipe to a larger pipe size.

The following stipulations apply when connecting gas piping.

•Use black iron or steel pipe and fittings for the building piping.

•Use pipe joint compound on male threads only. Pipe joint compound must be resistant to the action of the fuel used.

•Use ground joint unions.

•Install a drip leg to trap dirt and moisture before it can enter the gas valve. The drip leg must be a minimum of three inches long.

•Install a 1/8" NPT pipe plug fitting, accessible for test gage connection, immediately upstream of the gas supply connection to the furnace.

General Furnace Layout

UPFLOW INSTALLATIONS

When the gas piping enters through the right side of the furnace, the installer must supply the following fittings (starting from the gas valve):

•90 degree elbows (2).

•Close nipple.

•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):

•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.

IO-242C 19 05/05