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  • ECM 3.0 motor diagnostics

    From bob prohaska@21:1/5 to All on Wed Dec 27 00:53:46 2023
    I've been given a non-starting blower motor that was said to be
    faulty and replaced to the tune of about $1500. When I got
    the motor on the bench, it passed a basic run test, starting
    just fine and running steadily.

    The motor apparently has some sort of serial port with Rx and Tx
    pins, positive power and common terminals. The test procedure
    merely connects 24 volts of 60 Hz AC between common and Rx,
    whence the motor does a soft start and runs steadily, with
    a slight hunt that is reasonable for a no-load condition.

    Does anybody have info or docs which might let me do a
    more thorough test, such as vary the speed or read back
    data from the motor? The motor is simply marked

    Genteq

    ECM 3.0
    GCO8
    1/2 HP 120/240 V
    5/20/2010 15 0006MC5

    Letter O and numeral 0 look the same,
    so the transcription might mix them.

    There is a URL, thedealertoolbox.com, but I could find no
    useful information. YouTube videos proved far more helpful.

    The motor came out of a Carrier central HVAC
    system which has been surprisingly troublesome.

    Thanks for reading,

    bob prohaska

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  • From Jeff Layman@21:1/5 to bob prohaska on Wed Dec 27 10:12:50 2023
    On 27/12/2023 00:53, bob prohaska wrote:
    I've been given a non-starting blower motor that was said to be
    faulty and replaced to the tune of about $1500. When I got
    the motor on the bench, it passed a basic run test, starting
    just fine and running steadily.

    The motor apparently has some sort of serial port with Rx and Tx
    pins, positive power and common terminals. The test procedure
    merely connects 24 volts of 60 Hz AC between common and Rx,
    whence the motor does a soft start and runs steadily, with
    a slight hunt that is reasonable for a no-load condition.

    Does anybody have info or docs which might let me do a
    more thorough test, such as vary the speed or read back
    data from the motor? The motor is simply marked

    Genteq

    ECM 3.0
    GCO8
    1/2 HP 120/240 V
    5/20/2010 15 0006MC5

    Letter O and numeral 0 look the same,
    so the transcription might mix them.

    There is a URL, thedealertoolbox.com, but I could find no
    useful information. YouTube videos proved far more helpful.

    The motor came out of a Carrier central HVAC
    system which has been surprisingly troublesome.

    Thanks for reading,

    bob prohaska

    Anything here of use? Not sure if it applies to your motor or not: <https://unitedhvacmotors.com/manual/>

    --

    Jeff

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    * Origin: fsxNet Usenet Gateway (21:1/5)
  • From bob prohaska@21:1/5 to Jeff Layman on Wed Dec 27 17:50:33 2023
    Jeff Layman <[email protected]d> wrote:
    On 27/12/2023 00:53, bob prohaska wrote:
    I've been given a non-starting blower motor that was said to be
    faulty and replaced to the tune of about $1500. When I got
    the motor on the bench, it passed a basic run test, starting
    just fine and running steadily.

    Genteq

    ECM 3.0
    GCO8
    1/2 HP 120/240 V
    5/20/2010 15 0006MC5


    Anything here of use? Not sure if it applies to your motor or not: <https://unitedhvacmotors.com/manual/>

    Not directly. The webpage refers to a motor standard called X13,
    which I believe is different from ECM 3.0 though it may be functionally
    the same, or at least similar.

    The article did surprise me by saying to swap two of the
    three-phase motor leads to change direction of rotation. I
    thought surely that would be handled by software.

    It would be useful to just find a connection scheme that let me
    run the motor and vary the speed. If speed control works the
    motor is at least good enough to be useful. Actually "talking"
    to the motor via Rx and Tx would be instructive, however.

    https://unitedhvacmotors.com/change-motor-speed/
    makes reference to changing ECM speed, but only
    by setting DIP switches on the furnace control
    board. That's exactly what I don't have available.

    Thanks for writing, I did learn a little more!

    bob prohaska

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