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    minibike6969's Avatar
    minibike6969 Posts: 78, Reputation: 1
    Junior Member
     
    #1

    Sep 22, 2017, 08:27 PM
    Attic fan motor wiring
    I'm replacing my attic fan motor and the old motor only had three wires (red,blk,white ).the new motor has four wires( blk-hi,blu-med,red-low) so can anybody help me to wire this motor.
    donf's Avatar
    donf Posts: 5,679, Reputation: 582
    Printers & Electronics Expert
     
    #2

    Sep 23, 2017, 01:03 AM
    Where are you located? The existing wiring you describe would is for a 240vac circuit (three wire)

    Please give us the manufacturer and model number of the fan you are trying to install.
    Stratmando's Avatar
    Stratmando Posts: 11,188, Reputation: 508
    Uber Member
     
    #3

    Sep 23, 2017, 06:11 AM
    Old Fan may have been 2 speed? The New one a 3 speed, You could get a 3 speed rotary switch with an Off position. If existing was 2 speed, Black for low, and red for high or Vice Versa. Maybe?
    You can just use a single pole switch and use the speed you desire(low, medium, or high).
    Seeing how the existing is wired will help a lot, May even have adjustable temp control, When attic exceeds a temperature, it will turn on.

    Good Luck
    minibike6969's Avatar
    minibike6969 Posts: 78, Reputation: 1
    Junior Member
     
    #4

    Sep 23, 2017, 12:36 PM
    Dayton direct drive blower motor 1/2hp #4M101BG also do I need to add a capacitor and can I connect the control box from the old motor to the new motor and wire it to the low speed
    ma0641's Avatar
    ma0641 Posts: 15,675, Reputation: 1012
    Uber Member
     
    #5

    Sep 23, 2017, 12:44 PM
    It is probably a 2 speed fan motor. Look at the switch. Last one I replaced had a double throw switch. 1 hot, 2 speed. Motor should show wiring diagram.
    Stratmando's Avatar
    Stratmando Posts: 11,188, Reputation: 508
    Uber Member
     
    #6

    Sep 25, 2017, 08:36 AM
    You could use s single pole double throw, with a center "off" as mentioned
    Common terminal goes to hot, One pole could be 1 speed, the other pole a second speed, May need a rotary for all three speeds

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