Goodman Mfg VC8 User Manual download pdf (Page 18)

UPPLY

AND

IPING

A heat pump thermostat with three stages of heat is required to

properly use a two-stage furnace in conjunction with a heat

pump. Refer to the fossil fuel kit installation instructions for

additional thermostat requirements.

Strictly follow the wiring guidelines in the fossil fuel kit installa-

tion instructions. All furnace connections must be made to the

furnace two-stage integrated control module and the “FUR-

NACE” terminal strip on the fossil fuel control board.

115 VOLT L INE C ONNECTION OF A CCESSORIES ( H UMIDIFIER

AND

E LECTRONIC A IR C LEANER)

HIGHVOL TAGE!



AVOID



PERSONAL



INJURY



DEATH



DUE



ELECT RICAL



SHOCK

,

DISCONNECT



ELECT RICAL



POWER



BEFORE



SERVICING



CHANGING



ANY



ELECT RICAL



WIRING

WARNING

The furnace integrated control module is equipped with line

voltage accessory terminals for controlling power to an optional

field-supplied humidifier and/or electronic air cleaner.

The accessory load specifications are as follows:

Humidifier 1.0 Amp maximum at 120 VAC

Electronic Air Cleaner 1.0 Amp maximum at 120 VAC

Turn OFF power to the furnace before installing any accesso-

ries. Follow the humidifier or air cleaner manufacturers’ in-

structions for locating, mounting, grounding, and controlling

these accessories. Accessory wiring connections are to be

made through the 1/4" quick connect terminals provided on the

furnace integrated control module. The humidifier and elec-

tronic air cleaner hot terminals are identified as HUM and EAC.

The humidifier and electronic air cleaner neutral terminals are

identified as NEUTRAL. All field wiring must conform to appli-

cable codes. Connections should be made as shown.

Accessories Wiring

If it is necessary for the installer to supply additional line volt-

age wiring to the inside of the furnace, the wiring must conform

to all local codes, and have a minimum temperature rating of

105°C. All line voltage wire splices must be made inside the

furnace junction box.

The integrated control module humidifier terminals (HUM) are

energized with 115 volts whenever the induced draft blower is

energized. The integrated control module electronic air cleaner

terminals (EAC) are energized with 115 volts whenever the cir-

culator blower is energized.

24 VOLT H UMIDIFIER

A 5" long brown wire in the wire harness at the low fire pressure

switch provides 24 VAC humidifier control. This wire is pow-

ered any time the pressure switch is closed. To connect 24

VAC HUM, connect the 24 VAC line of the humidifier to the 5”

brown wire. The connection can be made by either stripping

the wire and using a wire nut or by using a field supplied quick

connect terminal. The wiring must conform to all local and

national codes. Connect the COM side of the humidifier to the

C terminal on the furnace control board (or to the COM side of

the 24 VAC transformer). Do not connect 115V humidifier to

these terminals.

UPPLY

AND

IPING

The furnace rating plate includes the approved furnace gas in-

put rating and gas types. The furnace must be equipped to

operate on the type of gas applied. This includes any conver-

sion kits required for alternate fuels and/or high altitude.

CAUTION



PREVENT



UNRELIA BLE



OPERATION



EQUIPMENT



DAMAGE

,

THE



INLET



GAS



SUPPLY



PRESSURE



MUST



SPECIFIED



THE



UNIT



RATING



PLATE



WITH



ALL



OTHER



HOUSEHOLD



GAS



FIRED



APPLIANCES



OPERATING

Inlet gas supply pressures must be maintained within the ranges

specified in the following table. The supply pressure must be

constant and available with all other household gas fired appli-

ances operating. The minimum gas supply pressure must be

maintained to prevent unreliable ignition. The maximum must

not be exceeded to prevent unit overfiring.

Natural Gas

Minimum: 5.0" w.c. Maximum:10.0" w.c.

Propane Gas

Minimum: 11.0" w.c. Maximum:13.0" w.c.

Inlet Gas Supply Pressure

NOTE: Adjusting the minimum supply pressure below the limits

in the above table could lead to unreliable ignition. Gas input to

the burners must not exceed the rated input shown on the

rating plate. Overfiring of the furnace can result in premature

heat exchanger failure. Gas pressures in excess of 13 inches

water column can also cause permanent damage to the gas

valve.

At all altitudes, the manifold pressure must be within 0.3 inches

w.c. of that listed in the Specification Sheet applicable to your

model for the fuel used. At all altitudes and with either fuel, the

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Goodman Mfg VC8 User Manual Page 18

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