Ecm motor controller

Old 12-17-22, 11:39 AM
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Ecm motor controller

My ECM blower motor has 4 programmed speeds that are selectable by providing one of 4 ac voltages (0,-12,+12,+24).
Does the 0v signal select the lowest programmed speed and +24v select the highest programmed speed?
Old 12-17-22, 11:43 AM
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Welcome to the forums.

Are you sure that it takes multiple DC voltages ?
Typically there are multi speed taps that are 24vac.
Selection of the correct tap denotes speed.
ECM blower speed selection

I need a model number or unit wiring diagram to comment further.

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