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i call electrical system the wires that provide the power from my apart and goes to blower motor(this is a AC water based fan coil unit) so I can tie in the 120v to any of the speeds?You need to look at the wiring diagram. Electric furnaces have 240 blower motors so white wire 120 and black,red or yellow another 120. If 120v blower motor hen white wire neutral and color wire 120v depending what speed you want. Not sure what you call electrical system? What model do you have