Whirlpool WGFD293 Instruction Manual download pdf (Page 26)

Fossil Fuel Applications

This furnace can be used in conjunction with a heat pump in a

fossil fuel application. A fossil fuel application refers to a

combined gas furnace and heat pump installation which uses an

outdoor temperature sensor to determine the most cost efficient

means of heating (heat pump or gas furnace).

A heat pump thermostat with 3 stages of heat is required to

properly use a 2-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 installation

instructions. All furnace connections must be made to the

furnace 2-stage integrated control module and the FURNACE

terminal strip on the fossil fuel control board.

115-Volt Line Connection of Accessories (Humidifier

and Electronic Air Cleaner)

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:

NOTES:

■ Turn off power to the furnace before installing any

accessories.

■ Follow the humidifier or air cleaner manufacturers’

instructions 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 electronic 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 applicable codes.

■ Connections should be made as shown in the “Optional

Accessories Wiring” illustration.

Optional Accessories Wiring

If it is necessary for the installer to supply additional line voltage

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

circulator blower is energized.

24-Volt Humidifier

A 5" (12.7 cm) long brown wire in the wire harness at the low-fire

pressure switch provides 24 VAC humidifier control. This wire is

powered any time the pressure switch is closed. To connect

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

(12.7 cm) brown wire. The connection can be made by either

stripping the wire and using a wire connector 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).

NOTE: Do not connect 115-Volt humidifier to these terminals.

GAS SUPPLY AND PIPING

The furnace rating plate includes the approved furnace gas input

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

on the type of gas applied. This includes any conversion kits

required for alternate fuels and/or high altitude.

Inlet gas supply pressures must be maintained within the ranges

specified in the Inlet Gas Supply Pressure chart. The supply

pressure must be constant and available with all other household

gas-fired appliances operating. The minimum gas supply pressure

must be maintained to avoid unreliable ignition. The maximum

must not be exceeded to keep the furnace from overfiring.

Humidifier 1.0 Amp maximum at 120 VAC

Electronic Air Cleaner 1.0 Amp maximum at 120 VAC

HIGH VOLTAGE!

WARNING

To avoid personal injury or death due to

electrical shock, disconnect electrical

power before servicing or changing any

electrical wiring.

15-Circuit Connector

Integrated Control Module

Humidifier

Electronic

Air Cleaner

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.

CAUTION

Inlet Gas Supply Pressure

Natural gas 5.0" W.C. minimum; 10.0" W.C. maximum

Propane gas 11.0" W.C. minimum; 13.0" W.C. maximum

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Whirlpool WGFD293 Instruction Manual Page 26

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