Furnace blower motor and capacitor....
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  • 2 Post By dkozloski
Community Lounge, Introductions and General Discussion Discussion, Furnace blower motor and capacitor.... in General Discussion; So I'm replacing my burned out furnace blower motor and capacitor (no heat except the fireplace and a space heater ...
  1. #1
    delerium75's Avatar
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    Furnace blower motor and capacitor....

    So I'm replacing my burned out furnace blower motor and capacitor (no heat except the fireplace and a space heater since Thursday...I'm cold!) and I'm about to install the new motor. In regards to the 2 wires that run to the capacitor from the new motor, one of them is tied off. I'm assuming it's denoting which wire is positive or negative but I'm having trouble finding online exactly which one it means. It's a direct replacement motor from Carrier so all the colors on new and old match up...I'm just trying to figure out what polarity the tied-end wire is. Any help folks?

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  3. #2
    Kingoftypos is online now Cadillac Owners Master
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    Re: Furnace blower motor and capacitor....

    I would think that it's 120 AC, so polarity doesn't really matter.

    What model number Carrier do you have? What search terms did you use to look up the wiring? Did you try your model number "wire schematic", "wire diagram", "service manual" or something along those lines?

    KOT

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    delerium75's Avatar
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    Re: Furnace blower motor and capacitor....

    Ok...I think I got this... The old motor's wiring diagram shows a polarized capacitor. The wiring diagram on the new motor shows a non-polarized capacitor (looks like an equal symbol...no curved line) so I'm assuming it doesn't matter for the new motor.

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    Submariner409's Avatar
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    Re: Furnace blower motor and capacitor....

    If the bent/taped wire is one of 3 or 4 motor leads it might be a speed control lead.

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    delerium75's Avatar
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    Re: Furnace blower motor and capacitor....

    The tied wire is one of two brown wires, both have the same markings...IE, one does NOT have a stripe, etc. Wiring diagram on the new motor shows the browns going to the capacitor, which is not polarized (and once I wiped the dust off the old motor, that one too, does NOT have polarized capacitor...just looked like it before I cleaned it off to compare).

    But there are a couple differences between the motor panel wiring diagram and what I found before I disconnected anything...my pictures I took don't match the wiring diagram. The diagram on the panel shows a polarized capacitor. And the red wire of the others (blue, red, black and white) that seem to govern speed control, depending on which plug it's connected to, doesn't match up to what I found. New and old motors are both 1/3hp, 115v, 1075rpm and 3speed, depending on how it's connected. So I think I'm going to connect the new wires exactly as I had found them...it ran that way fine for the last 4 years (furnace is 10 years old) and in the interest of just having heat tonight, not going to tinker.

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    Kingoftypos is online now Cadillac Owners Master
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    Whoa, why a second, maybe a third, motor for a ten year old furnace? Granted I have a boiler, but it's been going for 35 years. Do you have a lot of power problems in your area? Like brown outs or black outs?

    Since it's 115v, it's most likely a non polarized capacitor. So why it shows a polarized in the diagram is beyond me. KOT

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    Re: Furnace blower motor and capacitor....

    AND IT WORKS! I have warm, glorious central heating again!

    ----------

    @KOT...I think the capacitor went first and then took out the blower motor itself. There was sticky capacitor goo inside the blower box, on the fan wheel and bottom of the furnace. Having dealt with a couple Bose stereos, capacitors do dry out over time...just wish I would have caught this before the blower motor went DOA.

  9. #8
    Kingoftypos is online now Cadillac Owners Master
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    Well the goo was probably one if things that took out the motor. The other was the lack of a capacitor. Because the cap in this situation is to help the motor start. Most motors has two coils, the running and start. The start is only used for a split second, but wreck havoc on impedance in the power grid. The best thing to counteract the impedance is to put a capacitor in parallel with the motor. If the motor requires the cap, and the cap went dead, the most likely the motor will too.

    Gals you got it working though.

    KOT

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    Re: Furnace blower motor and capacitor....

    Working gals? Where?
    Don't mess with Binky Bear!


  11. #10
    Kingoftypos is online now Cadillac Owners Master
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    Quote Originally Posted by dkozloski
    Working gals? Where?
    Ha ha, at the casino that I work at.

    KOT

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