Goodman Mfg CVC9/95, MVC95 installation instructions Gaspipingconnections

GAS SUPPLY AND PIPING

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

GAS VALVE

This unit is equipped with a 24 volt gas valve controlled during furnace operation by the integrated control module. As shipped, the valve is configured for natural gas. The valve is field convertible for use with propane gas by replacing the regulator spring with a propane gas spring from an appropriate manufacturer’s propane gas conversion kit. Taps for measuring the gas supply pressure and manifold pressure are provided on the valve.

The gas valve has a manual ON/OFF control located on the valve itself. This control may be set only to the “ON” or “OFF” position. Refer to the lighting instructions label or Startup Procedure & Adjustment for use of this control during start up and shut down periods.

GASPIPINGCONNECTIONS

WARNING

TO AVOID POSSIBLE UNSATISFACTORY OPERATION OF EQUIPMENT DAMAGE DUE TO UNDERFIRING OR 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, NFPA54/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)

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. Re- fer to Gas Piping Connections figure for typical gas line connec- tions to the furnace.

•Use black iron or steel pipe and fittings for building piping. Where possible, use new pipe that is properly chamfered, reamed, and free of burrs and chips. If old pipe is used, be sure it is clean and free of rust, scale, burrs, chips, and old pipe joint compound.

•Use pipe joint compound on male threads ONLY. Always use pipe joint compound (pipe dope) that is APPROVED FORALLGASSES. DO NOT apply compound to the first two threads.

•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.

•Always use a back-up wrench when making the connection to the gas valve to keep it from turning. The orientation of thegasvalveonthemanifoldmustbemaintainedasshipped from the factory. Maximum torque for the gas valve connection is 375 in-lbs; excessive over-tightening may damage the gas valve.

•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. In order to seal the grommet cabinet penetration,rigidpipemustbeusedtoreachtheoutside of the cabinet. Asemi-rigid connector to the gas piping may be used from there.

•Use listed gas appliance connectors in accordance with their instructions. Connectors must be fully in the same room as the furnace.

•Protect connectors and semirigid 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.

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