GAS Supply and Piping, Accessories Wiring

GAS SUPPLY AND PIPING

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.

115VOLT LINE CONNECTION OF ACCESSORIES (HUMIDIFIER AND ELECTRONIC AIR CLEANER)

WARNING

HIGH VOLTAGE !

TO AVOID PERSONAL INJURY OR DEATH DUE TO

ELECTRICAL SHOCK, DISCONNECT ELECTRICAL POWER

BEFORE SERVICING OR CHANGING ANY ELECTRICAL

WIRING.

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 HUMIDIFIER

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.

GAS SUPPLY AND PIPING

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

TO PREVENT UNRELIABLE OPERATION OR EQUIPMENT DAMAGE, THE INLET GAS SUPPLY PRESSURE MUST BE AS SPECIFIED ON 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.

Inlet Gas Supply Pressure

Natural Gas	Minimum: 5.0" w.c.	Maximum:10.0" w.c.
Propane Gas	Minimum: 11.0" w.c.	Maximum:13.0" w.c.

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

VC8 specifications

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