Wiring Diagram Bathroom Fan And Light. Wiring a new exhaust fan with a heater and a light requires an understanding of how the electrical circuits control the fan heater and light. Look at the way your old exhaust fan.
Connect the blue light wire to the red wire in the 3 cable. The wiring diagram below shows the wiring setup you need to connect your new timed fan to your existing light circuit ceiling rose so that when the ligh is turned on so is the fan. Black wire is for the fan.
Shelly Lighting July 13 2018.
It shows the elements of the circuit as simplified forms and also the power and also signal connections in between the tools. Blue wire is for the light if light is included with the fan. Black wire is for the fan. Wire connections are as follows.
