Goodman Mfg VC8 instruction manual Important Note

ELECTRICAL CONNECTIONS

JUNCTION BOX RELOCATION

WARNING

EDGES OF SHEET METAL HOLES MAY BE SHARP. USE GLOVES AS A PRECAUTION WHEN REMOVING HOLE PLUGS.

Line voltage connections can be made through either the right or left side panel. The furnace is shipped configured for a right side electrical connection. To make electrical connections through the opposite side of the furnace, the junction box must be relocated to the left side prior to making electrical connec- tions. To relocate the junction box, perform the following steps.

WARNING

TO PREVENT PERSONAL INJURY OR DEATH DUE TO ELECTRIC SHOCK,

DISCONNECT ELECTRICAL POWER BEFORE INSTALLING OR SERVICING THIS UNIT.

1.Remove both doors from the furnace.

2.Remove and save the screws holding the junction box to the right side of the furnace.

3.Models that have the junction box located in the burner or blower compartment will need to move the junction box directly over.

4.Attach the junction box to the left side of the furnace, using the screws removed in step 2.

5.Check the location of the wiring. Confirm that it will not be damaged by heat from the burners or by the rotation of the fan. Also confirm that wiring location will not interfere with filter removal or other maintenance.

After the junction box is in the desired location, use washers to connect field-supplied conduit to the junction box in accordance with NEC and local codes. Connect hot, neutral, and ground wires as shown in the furnace wiring diagram. The wires and ground screw are located in the furnace junction box.

NOTE: In downflow applications the power leads should be routed through the supplied wire tabs when locating junction box to the left side.

Low voltage wires may be connected to the terminal strip.

IMPORTANT NOTE: To avoid possible equipment malfunction, route the low voltage wires to avoid interference with filter re- moval or other maintenance.

WARNING

HIGH VOLTAGE !

TO AVOID THE RISK OF INJURY, ELECTRICAL SHOCK OR

DEATH, THE FURNACE MUST BE ELECTRICALLY

GROUNDED IN ACCORDANCE WITH LOCAL CODES OR IN

THEIR ABSENCE, WITH THE LATEST EDITION OF THE

NATIONAL ELECTRIC CODE.

To ensure proper unit grounding, the ground wire should run from the furnace ground screw located inside the furnace junc- tion box all the way back to the electrical panel. NOTE: Do not use gas piping as an electrical ground. To confirm proper unit grounding, turn off the electrical power and perform the following check.

1.Measure resistance between the neutral (white) connection and one of the burners.

2.Resistance should measure 10 ohms or less.

This furnace is equipped with a blower door interlock switch which interrupts unit voltage when the blower door is opened for servicing. Do not defeat this switch.

24 VOLT THERMOSTAT WIRING

IMPORTANT NOTE

WIRE ROUTING MUST NOT INTERFERE WITH CIRCULATOR BLOWER OPERATION, FILTER REMOVAL OR ROUTINE MAINTENANCE.

A REMOVABLE PLUG CONNECTOR IS PROVIDED WITH THE CONTROL TO MAKE THERMOSTAT WIRE CONNECTIONS. THIS PLUG MAY BE REMOVED, WIRE CONNECTIONS MADE TO THE PLUG, AND REPLACED. IT IS STRONGLY RECOMMENDED THAT MULTIPLE WIRES INTO A SINGLE TERMINAL BE TWISTED TOGETHER PRIOR TO INSERTING INTO THE PLUG CONNECTOR. FAILURE TO DO SO MAY RESULT IN INTERMITTENT OPERATION.

As a two-stage non-communicating furnace, the furnace inte- grated control module provides terminals for both “W1” and “W2”, and “Y1” and “Y2” thermostat connections. This allows the furnace to support the following system applications: ‘Two- Stage Heating Only’, ‘Two-Stage Heating with Single Stage Cool- ing’, and ‘Two-Stage Heating with Two-Stage Cooling’. Refer to the following figures for proper connections to the integrated control module.

Low voltage connections can be made through either the right or left side panel. Thermostat wiring entrance holes are located in the blower compartment. The following figure shows con- nections for a “heat/cool system”.

This furnace is equipped with a 40 VA transformer to facilitate use with most cooling equipment. Consult the wiring diagram, located on the blower compartment door, for further details of 115 Volt and 24 Volt wiring.

NOTE: For single stage cooling applications, a jumper must be located between Y1 and Y2 at the furnace control in order to achieve the desired single stage cooling airflow. Use of ramping profiles and dehumidification features require a jumper between Y1 and O and Y1 and DEHUM, respectively.

NOTE: Thermostat “R” required if outdoor unit is equipped with a Comfort Alert™ module or if the out door unit is a part of the ComfortNet™ family of equipment AND is wired as a legacy system.

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