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I have an A.O. Smith f48l47a50 blower motor, and I need help with wiring. First it's a 460v,1phase,1/2hp,975rpm,3spd motor. My question with the wiring is do I need to supply a wire for line power? I know the brown and purple go to the capacitor. The green is ground. I guessing the blue and orange are to designate low/med speed, but that's all the wires that are attatched. I think I need to supply a wire from the blower motor relay to the motor's hi spd terminal. Could you confirm this?

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  • steelhead20 Jul 30, 2009

    dmftrucker- Yes, it's definitly a 460, 1 phase motor. The RTU itself is a 3-phase, but the supply and condenser fan motors are 1 phase.

  • t1m130
    t1m130 May 11, 2010

    what brand/model furnace are you installing this in ? is this an exact replacement from the one that went bad?


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Are you SURE its 460volt single phase??? that voltage is normally a 3phase motor voltage,and color of wires is right for 480/277, but that would be 3 phase.....not saying your wrong,just make sure

Posted on Jul 30, 2009

  • daniel  hendrickson
    daniel hendrickson Jul 30, 2009

    hi again youre right, go to aosmith website maybe they can give you some input or the maker of the unit its installed on...sorry


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Thank you for posting your question here on

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For details look at the AOSmith print here.

If this answer does not fix your problem, please comment with additional details prior to rating the answer. Positive feedback is appreciated once your problem is solved!


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Hello. If the unit is rated 460v, 3phase, the only way you can get it to meet your supply of 208v, 3phase, is:
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b) replace the heating elements for the 208v supply, have the pump motor checked to see if it will work on 208v, and a control transformer for the control circuit, as well as all the wiring related to the pump and heaters, as on 208v, they will draw more current than on 460.
so, can it be done? yes. Is the expense worth it? only you can answer that, However I would suggest that you resell that machine, and get the correct one from the start.

Hope that helps, and thank you.

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