hvac fan

Discussion in 'HVAC' started by frodo, May 29, 2015.

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  1. May 29, 2015 #1

    frodo

    frodo

    frodo

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    hello guys, i have a hvac central unit fan i took out of an old unit

    which wire is the hot and common?

    i have red,blue,yellow white black

    i thought it was white black,,i was wrong

    want to put it in the shop,,to keep cool with

    wires 002.JPG

    wires 001.JPG
     
  2. May 29, 2015 #2

    nealtw

    nealtw

    nealtw

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    I can tell you that trial and error does not work, I tried with one a few years ago, it ran for about ten minutes bfore it broke into flames.:eek:
     
  3. May 29, 2015 #3

    frodo

    frodo

    frodo

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    yeah,,,,,,i touched wh blk to a cord and it said errrrrrrrrrrrrrrrrr...so i stopped to ask directions
     
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  4. May 29, 2015 #4

    bud16415

    bud16415

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    There is supposed to be a rotary switch to go along with your fan I think. The blue red and black will go to the switch. I think white would be common and yellow power. The switch would make connections for speeds.
    That’s just my guess without really digging into it.
     
  5. May 29, 2015 #5

    frodo

    frodo

    frodo

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    i got it

    white- common
    blk- high speed
    blue- medium
    red--low speed

    yellow, some kinda safety bs
     
    Last edited: May 30, 2015
  6. May 29, 2015 #6

    bud16415

    bud16415

    bud16415

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    Again I’m just guessing but I think it’s a two speed fan. Switching between blue and red or blue and black maybe to get a high and low speed. Power to yellow and white to common??????
    Are there any identification markings on it? If you get an idea of how it might be wired you could connect those wires and then measure resistance to get a clue.

    Or wait around till a pro sees your post and get a good answer. I wouldn’t just start throwing power to wires though. Good way to burn something out.
     
  7. May 30, 2015 #7

    frodo

    frodo

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    still,working on it.

    i have blue abnd white to a pig tail fan is running

    but.

    what is the yellow?

    i found a generic wire diagram,,but it has a purple where i have a white

    Univwersal Fan Motor.jpg

    motor nomenlature
    motor 001.jpg
     
  8. Jun 14, 2015 #8

    frodo

    frodo

    frodo

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    put a pair of wire cutters and a screwdriver in my pocket
    walked around the junk yard..founda old fan, motor gone but switch still their

    got the 3 speed switch, and wired it

    it was easy,,,blk to blk, blue to,bl,,,red to rd

    white to white, grey to grey green to scrw

    works great..

    fan 3 w switch 001.JPG

    fan 3 w switch 002.JPG
     
    Last edited: Jun 14, 2015
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  9. Jun 29, 2015 #9

    falconbrother

    falconbrother

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    I replaced the motor in my air handler this winter. Came home from the Caribbean too 22 degrees and no heat.. Anyway, there was a label on the old motor and the replacement motor that laid out where all the wires go and/or what they do. Glad you got it running. Good idea.
     

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