One will be for heat and the other for cool. Most guys use high for cool but it really depends on AC size and furnace temp rise.
Wiring 115V gas furnace blower motor
Replacing a 115V 3spd blower motor for air handler in older gas furnace. New motor wiring diagram explains thuroughly exept where red wire of 3 conductor R,WH, BLK coming from control panel. Rotation wiring correct from box. Got 2 browns to capacitor, white to white, and black to black-high speed.
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