Heater-fan-light combination units use metal duct to vent to the exterior.
A heat-fan-light unit combines three separate appliances in one compact piece of equipment. A heat-fan-light unit wires into a standard residential 120-volt electrical system. Each portion of the unit operates on a switch designed specifically for a heat-fan-light combination unit. The fan connects to a duct that must vent to the exterior of the home, usually through the closest soffit. The heater portion uses a blower motor to force air over a resistance-style heating element and into the room the combination unit services.
Instructions
1. Remove the fan, light and heater assemblies from the unit's housing with the correct screwdriver. In most cases two hex-head screws hold each part to the housing and each piece plugs into a receptacle that mounts to the housing's electrical connection box. Open the electrical connection box's lid with the correct screwdriver.
2. Cut a hand-sized hole in the ceiling's drywall in the desired installation location with a drywall saw. Remove the drywall hole. Reach through the hole and verify the ceiling's trusses will not interfere with the combination unit.
3. Press the unit's housing against the ceiling over the hand-sized hole. Trace the housing's outline with a pencil. Cut the outline with the drywall saw.
4. Mount the heater-fan-light unit's housing to the rafters with 1-inch drywall screws. Keep the housing centered over the hole in the ceiling.
5. Run the metal flex duct from an approved termination point, usually a soffit, to the fan's exhaust port. Slide the duct over the port and secure the duct to the port with duct tape. Check with the local building department for a list of approved vent termination points.
6. Turn the breaker off in your homes main electrical panel which feeds the switch where you intend to feed the unit from. Verify there is no power present in the box by removing the cover plate and touching the wires with a non-contact voltage tester. Run two sections of 12-2 wire with ground from the switch's electrical box to the unit's housing, leaving about 12 inches of extra wire at the combination unit. Cut each wire to length cutters. The switch's electrical box contains a 12-2 wire with ground that leads to the circuit breaker. Wrap both ends of one of the wire sets that travel between the switch and the unit's housing with electrical tape. Each 12-2 with ground wire-set contains two 12-gauge insulated wires and an uninsulated wire. A plastic protective shield covers the wires in each set.
7. Push the ends of the wires into the wire access holes located on the unit's housing and in the switch's electrical box.
8. Remove 6 inches of the plastic shield from each end of each wire set with a razor knife. Strip 1/2 inch of insulation from the insulated wires in each wire set with wire strippers.
9. Cut a 6-inch section of wire, called a jumper wire, with wire cutters. Remove 1/2 inch of insulation from both ends of the jumper wire.
10. Twist all of the uninsulated wires in the switch's electrical box and the jumper wire together. Screw a wire nut over these wires.
11. Loosen the terminal screws on a heater-fan-light combination switch with a Phillips screwdriver. The switch contains an input terminal, called "Line," a terminal for each function and a green ground screw. Each function terminal has an identification label stamped into the switch's housing.
12. Wrap the end of the jumper wire around the switch's green ground screw and tighten the screw with the Phillips screwdriver.
13. Wrap the black-colored wire from the circuit breaker around the switch's "Line" terminal screw. Tighten the terminal screw with the Phillips screwdriver.
14. Twist the white-colored wire from the circuit breaker to the white-colored wire in the wire set marked with electrical tape. Secure these wires with a wire nut.
15. Wrap the black-colored wire from the wire set marked with electrical tape around the switch's "Heater" terminal screw. Tighten the screw with the Phillips screwdriver.
16. Wrap the black-colored wire from the remaining wire set around the switch's "Fan" terminal screw. Tighten the screw with the Phillips screwdriver.
17.Wrap the remaining white-colored wire around the switch's "Light" terminal screw. Tighten the screw with the Phillips screwdriver.
18. Push the switch into its electrical box and tighten its mounting screws with a slotted screwdriver.
19. Twist the two ground wires from the switch to the green-colored wire in the heater-fan-light combination unit's electrical connection box. Secure these wires with a wire nut.
20. Twist the white-colored wire in the wire set marked with electrical tape to the unit's three neutral wires, the white-colored wires. Secure these wires with a wire nut. Each part of the heater-fan-light unit uses a plug with two wires, one hot and one neutral. Each plug uses a label, wrapped around the hot wire, for identification.
21. Twist the black-colored wire from the wire set marked with electrical tape to the unit's wire with a "Heater" label and secure them with a wire nut. Usually the unit's red-colored wire connects to the heater's plug.
22. Twist the remaining black-colored wire from the switch to the unit's wire with a "Fan" label and secure them with a wire nut. Usually the unit's black-colored wire connects to the fan's plug.
23. Twist the remaining white-colored wires from the switch to the unit's wire with a "Light" label and secure them with a wire nut. Usually the unit's blue-colored wire connects to the light's plug.
24. Close the electrical connection box's lid.
25. Plug the heater, fan and light assemblies into their respective plugs. Secure each piece into the unit's housing with the retaining screws. Press the heater-fan-light's cover onto the housing. Turn the breaker on and test the unit.
Tags: with wire, wire with, unit housing, black-colored wire, Phillips screwdriver