Goodman Mfg ACVC9/AMVC95, GCVC9/GMVC95 service manual Product Design, General Operation

PRODUCT DESIGN

General Operation

Models covered by this manual come with a new 4-wire com- municating PCB. When paired with a compatible communi- cating indoor unit and a CTK01AA communicating thermo- stat, these models can support 4-wire communication pro- tocol and provide more troubleshooting information. These models are also backward compatible with the legacy ther- mostat wiring.

The GCVC9, GCVC95, GMVC95, AMVC95, ACVC9 and ACVC95 furnaces are equipped with an electronic ignition device to light the burners and an induced draft blower to exhaust combustion products.

An interlock switch prevents furnace operation if the blower door is not in place. Keep the blower access doors in place except for inspection and maintenance.

These furnaces are also equipped with a self-diagnosing elec- tronic control module. In the event a furnace component is not operating properly, the control module's dual 7-segment LED's will display an alpha-numeric code, depending upon the problem encountered. These LED's may be viewed through the observation window in the blower access door. Refer to the Troubleshooting Chart for further explanation of the LED codes and Abnormal Operation - Integrated Igni- tion Control section in the Service Instructions for an expla- nation of the possible problem.

The rated heating capacity of the furnace should be greater than or equal to the total heat loss of the area to be heated. The total heat loss should be calculated by an approved method or in accordance with “ASHRAE Guide” or “Manual J-Load Calculations” published by the Air Conditioning Con- tractors of America.

*Obtain from: American National Standards Institute 1430 Broadway New York, NY 10018

Location Considerations

•The furnace should be as centralized as is practical with respect to the air distribution system.

•Do not install the furnace directly on carpeting, tile, or combustible material other than wood flooring.

•When suspending the furnace from rafters or joists, use 3/8" threaded rod and 2” x 2” x 1/8” angle as shown in the Installation and Service Instructions. The length of the rod will depend on the application and clearance necessary.

•When installed in a residential garage, the furnace must be positioned so the burners and ignition source are located not less than 18 inches (457 mm) above the floor and protected from physical damage by ve- hicles.

Notes:

1.Installer must supply one or two PVC pipes: one for com- bustion air (optional) and one for the flue outlet (required). Vent pipe must be either 2” or 3” in diameter, depending upon furnace input, number of elbows, length of run and

installation (1 or 2 pipes). The optional Combustion Air Pipe is dependent on installation/code requirements and must be 2” or 3” diameter PVC.

2.Line voltage wiring can enter through the right or left side of the furnace. Low voltage wiring can enter through the right or left side of furnace.

3.Conversion kits for propane gas and high altitude natural and propane gas operation are available. See High Alti- tude Derate chart for details.

4.Installer must supply the following gas line fittings, de- pending on which entrance is used:

Left -- Two 90° Elbows, one close nipple, straight pipe Right -- Straight pipe to reach gas valve.

Accessibility Clearances (Minimum)

*MVC95* MINIMUM CLEARANCES TO COMBUSTIBLE MATERIALS

(INCHES)

POSITION*		FRONT	SIDES	REAR	TOP	FLUE	FLOOR
	Upflow	3	0	0	1	0	C
Horizontal		Alcove	6	0	4	0	C
*=	All positioning is determined as installed unit is viewed from the front.
C=	If placed on combustible floor, floor MUST be wood only.
NC= For instalaltion on non-combustible floors only. A combustible
	subbase must be used for installations on combustible flooring.
*CVC9 MINIMUM CLEARANCES TO COMBUSTIBLE MATERIALS
			(INCHES)
POSITION*		FRONT	SIDES	REAR	TOP	FLUE	FLOOR
	Upflow	1	0	0	1	0	NC
Horizontal		Alcove	6	0	4	0	C
*=	All positioning is determined as installed unit is viewed from the front.
C=	If placed on combustible floor, floor MUST be wood only.

NC= For instalaltion on non-combustible floors only. A combustible subbase must be used for installations on combustible flooring.

Alcove Illustration

	REAR
E	S
	I
D	D
I	E
S
	ALCOVE

24" at front is required for servicing or cleaning.

Note: In all cases accessibility clearance shall take precedence over clearances from the enclosure where accessibility clearances are greater. All dimensions are given in inches.

High Altitude Derate

When this furnace is installed at high altitude, the appropri- ate High Altitude orifice kit must be installed. This is re-

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