Variable Speed Ceiling Fan Wiring Diagram. The wire colors in a basic fan/light kit are typically black, blue, white, and green. This setup allows you to control the light and fan separately.
The ECM variable speed fan motors are used in condensers that have a modulating compressor. Ceiling fan speed control wiring diagram with speed control switch, fan motor, capacitor and supply for low, med and high speeds. More often than not, you're going to have a ceiling light fixture at the location you are planning on installing a ceiling fan.
Some fan motors are sensitive to signals from Solid State variable speed controls.
If this is the case, then odds are that this old ceiling light only has enough wires to switch.
The ECM variable speed fan motors are used in condensers that have a modulating compressor. Ceiling fans are typically equipped with either three or four speeds and two rotational directions. The diagram below shows the actual values that I measured.