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I just replaced the blower motor on an older Lenox system. Black high speed wire. White and blue medium wire. The blower seems to be running much slower than expected. Not sure where to go from here. I took out the filter and that helped some but still seems quite slow. It might be notable that until the blower went out, it wouldn't turn off. But I never got around to worry about that. But now it won't cool the home because there's just not enough air coming through. And I'm not sure what to look at at this point. Could the capacitor be causing it to be slow? It seems to start just fine.

Thank you

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  • Can you provide a picture of the motor nameplate?
    – JACK
    Jun 14, 2021 at 23:31
  • Is the replacement blower certified, or considered equivalent, by Lenox for the same model?
    – r13
    Jun 15, 2021 at 0:47
  • compare the "boilerplates" of the two motors.
    – Jasen
    Jun 15, 2021 at 10:58
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    It sounds like you may not have the motor wired correctly. Or the new motor is a different speed. Are you only using blue and black? Are both motors the same voltage? Are they similar speeds for the different taps? Photos of the nameplate would be helpful.
    – Ed Beal
    Jun 15, 2021 at 15:47
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    The capacitor is for starting the motor. Jul 5, 2023 at 12:09

1 Answer 1

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Check the RPM rating of both motors, they should be about the same. Validate the color code they may be different. You can always connect it for the other speed to be sure. Check the current rating and draw, they should be about the same. I am assuming it is a squirrel cage fan, is it direct drive or belt driven. If belt driven be sure the pulley is the same size and is tight.You stated: "The blower seems to be running much slower than expected" how did you determine that. Check the condenser, assuming it was working properly before and see if it is icing up, if it is you are correct, if not the speed is probably OK. This should get you close. Be sure they rotate in the correct direction.

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    This is not really an answer to the question but more of a comment.
    – Ed Beal
    Jun 15, 2021 at 15:49
  • I replaced one once. The speed was determined by the which color wire was connected. As suggested, and if it's the same type of configuration, try another colored wire. Jul 5, 2023 at 12:11

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