Goodman Mfg VC8 Circulating AIR and Filters, Gas Altitude Kit Orifice Manifold Pressure

CIRCULATING AIR AND FILTERS

air temperature rise must be within the range listed on the fur- nace nameplate. Should this appliance be converted to LP, refer to the instructions included in the factory authorized LP conversion kit.

HIGH ALTITUDE DERATE

IMPORTANT NOTE: The furnace will naturally derate itself with altitude. Do not attempt to increase the firing rate by changing orifices or increasing the manifold pressure. This can cause poor combustion and equipment failure.

High altitude installations may require both a pressure switch and an orifice change. These changes are necessary to com- pensate for the natural reduction in the density of both the gas fuel and the combustion air at higher altitude.

For installations above 7000 feet, please refer to your distribu- tor for required kit(s).

Gas	Altitude	Kit	Orifice	Manifold Pressure		Pressure
						Switch Change
				High Stage	Low Stage
Natural		None	#43	3.5" w.c.	1.9" w.c.	None
	0-7000
Propane		LPM-05*1	#55	10.0" w.c.	6.0" w.c.	None
		LPM-06*2

1LPM-05* supports White-Rodgers 2-stage valve only

2LPM-06* supports Honeywell and White-Rodgers 2-stage valves NOTE: In Canada, gas furnaces are only certified to 4500 feet.

Contact the distributor for a tabular listing of appropriate manufacturer’s kits for propane gas and/or high altitude instal- lations. 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.

PROPANE GAS CONVERSION

WARNING

POSSIBLE PROPERTY DAMAGE, PERSONAL INJURY OR DEATH MAY OCCUR IF THE CORRECT CONVERSION KITS ARE NOT INSTALLED. THE APPROPRIATE KITS MUST BE APPLIED TO ENSURE SAFE AND PROPER FURNACE OPERATION. ALL CONVERSIONS MUST BE PERFORMED BY A QUALIFIED INSTALLER OR SERVICE AGENCY.

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 instal- lations. 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

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.

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)

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.

•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.

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