I am installing a new Bathroom Fan/Light combo to replace an older unit. The new one comes with 5 connections – 2 black and 2 white (one of each labeled fan and light) plus a ground. My wiring has 4 wires – 1 black, 1 white, 1 red and a ground. Need some advice on how to wire this properly. Thanks in advance.
Wiring – Bathroom Fan/Light Combo
bathroomventilationwiring
Related Solutions
No way from here to know which wire fed the light or fan, but you have a continuous hot feed into the box that fed the receptacle, light and fan. The third wire, maybe it fed the fan or maybe something something else farther down the line, if the latter that needs to be tied in 100 percent to the hot feed. All whites still tied together, blacks to the dimmer from the light and hot. All grounds tied together set with a screw to the metal box. Securing the ground to the box is not needed if the box is plastic.
Before I got too wordy, here is a sketch
Still have to learn to format better
The sketch is a little rough, it should get the idea across I hope
Not counting the ground wires, you have four insulated conductors. One could be the supply hot, each of the others could be switched hot leads. The presumption would be that the neutral is in the ceiling box and not present in the wall box. Totally possible. If this is true, please mark the switched hot leads appropriately.
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Best Answer
The old one had a single neutral wire, which absolutely forced you to have fan and light on the same circuit.
The new one has 2 separate neutral wires, allowing you the option of putting fan and light on totally separate circuits. If you don't want to exercise the option, simply add both neutral wires to the place the old neutral was before.
As far as the blacks, one is hot for the fan, the other is hot for the light. Mark one of them with red tape, and wire it like the old unit. If this has now exchanged the switches, then put the red tape on the other black instead, and repeat.