Fedders Official Manual for Furnace: Installation and Safety Guidelines

DANGER

THE FURNACE CABINET MUST HAVE AN UNINTERRUPTED GROUND.

A GROUND WIRE IS PROVIDED IN THE ELECTRICAL JUNCTION BOX.

DO NOT USE GAS PIPING AS A GROUND.

FAILING TO GROUND THE FURNACE PROPERLY CAN RESULT IN ELECTRIC SHOCK RESULTING IN PERSONAL INJURY OR DEATH.

In the United States, all electrical work must be in accordance with the latest edition of the National Electrical Code, ANSI / NFPA 70, in Canada, all electrical work must be in accordance with the latest edition of CSA-C22.1, Canadian Electrical Code Part 1, and any applicable local code.

Although a suitably located circuit breaker may serve as a service switch, a separate service switch is recommended.

A separate in service switch is necessary if the circuit breaker is in a location where accessing it would require getting close to the furnace, or if the furnace is located between the main electrical panel and the entry to the furnace room. The furnace switch (service switch) should be clearly labeled and installed in a location where it is not likely to be mistaken as being a light switch or similar control.

FURNACE CONNECTION

120V: The furnace is shipped fully wired except for the connections to the house wiring. The furnace power connections are made in a junction box inside the blower compartment. The junction box is factory installed on the left hand side however, it may be moved to the right hand side. The junction box contains a BLACK wire to be connected with L1 (hot), a WHITE wire to be connected with L2, the Neutral, and a GREEN wire to be connected to the ground.

Use good quality wire nuts; e.g. Marrette® connectors, Ideal® wire nuts, etc.

IMPORTANT: USE COPPER CONDUCTORS ONLY

If the junction box must be moved to the right hand side:

1.Unfasten the junction box from the left hand side.

2.Remove the right side panel knockout.

3.Remove the junction box cover hook screw and reinstall it on the opposite side of the box.

4.Fasten the junction box to the right hand panel.

NOTE: L1 (hot) and L2 (Neutral) polarity must be observed when making field connections to the furnace. The ignition control may not sense flame if L1 and L2 are reversed. The ground is also essential.

NOTE: The furnace shall be installed so the electrical components are protected from water.

WARNING

THIS FURNACE IS EQUIPPED WITH A BLOWER DOOR SAFETY SWITCH. DO NOT DISABLE THIS SWITCH. FAILURE TO FOLLOW THIS WARNING CAN RESULT IN ELECTRICAL SHOCK, PERSONAL INJURY, OR LOSS OF LIFE.

CAUTION

ELECTRICAL WIRING AND COMPONENTS MUST BE PROTECTED FROM MOISTURE, INCLUDING WATER AND CONDENSATE.

WARM AIR FURNACE

LOW VOLTAGE WIRING

The low voltage terminals are located on the control board mounted to the blower assembly; see Figure 11 on page 19.

The furnace is prewired for air conditioning. Insert the thermostat and air conditioner contactor low voltage wiring through the bushing provided in the side panel. Route the control wiring through the blower compartment to the 24 volt terminal screws.

THERMOSTAT

The room thermostat must be compatible with the integrated control in the furnace. Electromechanical thermostats should be rated 30 V / 1.5 amps.

Most electronic or microprocessor based thermostats except those with "current robbing" circuits should work satisfactorily. Consult the instructions of the thermostat manufacturer for technical and installation details.

Most compatibility problems can be overcome by the use of an isolation relay. The isolation relay should be SPST with a 24- volt coil. The switch ratings should be a minimum of 0.5 amps; see figure 9 below.

The thermostat and control wiring should be a minimum of 18 AWG copper. Excessive lengths of wire may result in enough voltage drop to impair the proper functioning of the furnace. For thermostat wires in excess of 25 feet, use 16 AWG; 50 feet, use 14 AWG.

FigureFigure9:13:IsolationRelayrelay

R	THERMOSTAT
G		COOLING
Y	Y
		CONTACTOR
W		G
		FAN
		RELAY
	W
	HEATING RELAY
115V	24V

THERMOSTAT LOCATION

The thermostat should be located approximately 5 feet above the floor, on an inside wall where there is good natural air circulation, and where the thermostat will be exposed to average room temperatures. Avoid locations where the thermostat will be exposed to cold drafts, heat from nearby lamps or appliances, exposure to sunlight, heat from inside wall stacks, etc.

THERMOSTAT HEAT ANTICIPATOR SETTING: 0.45 AMP (White-Rodgers)

See page 21 for information on connecting optional accessories such as electronic air cleaners and power humidifiers.

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