Blower Fan Switch Wiring

Blower fan wire color codes. The speed wires connected to the blower motor are connected to a fan relay which uses a low voltage signal to activate a high voltage switch. Typical fan wire colors in an air handler or at the blower motor will be not all of these are always present.

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On yours the 12 volt goes right to the fan motor and from there to all the resistors then one of them is grounded by the switch.

Blower fan switch wiring. Medium fan speed power lead. The common terminal on the switch goes to ground and that is shown as a black wire. Constant voltage for the blower motor is maintained via a capacitor supplying voltage across its secondary winding. Low fan speed power lead.

4 6 out of 5 stars 10. Get it as soon as thu jul 23. Hope this helps a few folks out. Wpt1285 645 512 blower motor resistor connector wpt1285 wire assembly ac fan blower wire harness pigtail compatible with 2010 2015 ford fusion 11 14 lincoln mkz base hybrid 10 11 mercury milan.

In my diagram current starts at a 60 amp fuse which will be under the hood and it will feed other systems. High fan speed power lead. This fan and limit control combines in one enclosure a fan switch with an adjustable differential which operates the blower in a forced warm air furnace and a limit switch with a fixed differential which automatically shuts off the burner if the furnace temperature exceeds a predetermined high point. Video demonstrating the standard wiring for the primary blower motor found in most furnaces and air handlers in residential hvac.

Medium high fan speed power lead. The blower motor capacitor mounts to the outside of the blower s housing.