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  1. #14
    Join Date
    Aug 2016
    Location
    PA USA
    Posts
    42
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    X2 on draft motor. Centrifugal switch could be intermittently failing to close. I would also check integrity of heat relay and limit wire/ terminal on main board.

  2. #15
    Join Date
    Jan 2017
    Posts
    6
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    Thread Starter
    Quote Originally Posted by VTP99 View Post
    Per your model number you have a factory installed smoke detector in the return air section. Have you looked over the smoke detector ?
    I did not check that, but the smoke detector would kill the entire unit correct? and then have to be manually reset?
    Ill have to give the inducer a check and see if the amp draw is high

  3. #16
    Join Date
    Nov 2006
    Location
    Southeastern Pa
    Posts
    32,174
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    Quote Originally Posted by dmartin528 View Post
    I did not check that, but the smoke detector would kill the entire unit correct? and then have to be manually reset?
    Ill have to give the inducer a check and see if the amp draw is high
    Where a centrifugal switch is used to prove inducer operation, you not only have to check for amp draw of the motor, but also voltage drop across the centrifugal contacts. A more definitive contact check would be to remove the centrifugal switch wires and run the motor, and look for resistance when connected to those now-unpowered centrifugal switch leads.
    [Avatar photo from a Florida training accident. Everyone walked away.]
    2 Tim 3:16-17

    RSES CMS, HVAC Electrical Specialist
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  4. #17
    Join Date
    Nov 2011
    Location
    East Side
    Posts
    7,469
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    Inducer uses a pressure switch.
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