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  1. #1
    Join Date
    Sep 2012
    Posts
    373

    Inducer motor running at high amps

    We had our systems checked up last October for our annual tune-up/inspection.

    The technician found the inducer on our first floor furnace (2002 Lennox G40) running at high amps (running 2.4 amps rated for 1.95). I don't know if this is considered "high" or not. He said that it was overheating. The furnace has been performing fine lately with no issues.

    What could be causing the inducer to be running at high amps? The inducer was also checked during last year's tune-up and it was fine. Will the inducer eventually fail? Thanks in advance. Thanks for the input in my previous posts.

  2. #2
    Join Date
    Dec 2002
    Location
    Houston,Tx.
    Posts
    15,849
    Easiest thing you can do is to ease your mind, is have someone else check the amps with another meter, chances are two meters won't be wrong, then you can make the decision at that time to change it.
    __________________________________________________ _______________________
    “Experience is a hard teacher because she gives the test first, the lesson afterwards". - Vernon Law

    "Never let success go to your head, and never let failure go to your heart". - Unknown

  3. #3
    Join Date
    Sep 2012
    Posts
    373
    Thank you for the advice. Earlier this month we had another tech come out from a different company and he said the same thing. He did use a different meter.

  4. #4
    Join Date
    May 2012
    Location
    Upper Michigan
    Posts
    3,588
    It's something that if over amping can fail, do you want it to go out on Saturday night when it will cost 25% or more? The problem is it hard to estimate how long it will last, but lets just say they fail quite often.

  5. #5
    Join Date
    Sep 2012
    Posts
    373
    So are you saying that it might be a good idea to go ahead and have the inducer replaced? Both techs said that it will eventually fail sometime in the future but you never know when. The furnace is oversized (90,000 BTU for 2200 sq. ft. - that's too big) and it short cycles a lot and we thought about replacing it in a few years with a smaller size (maybe a 60,000 BTU 2 stage or 45,000 BTU single stage, depends on what manual j calls for)

  6. #6
    Join Date
    May 2012
    Location
    Upper Michigan
    Posts
    3,588
    If you are thinking About replacing it may be ok to wait, but it's hard to say how long It may last.

  7. #7
    Join Date
    Dec 2002
    Location
    Houston,Tx.
    Posts
    15,849
    Most inducer motors run high rpm's around 3000 and to add to that, they are surrounded by heat, those are already two minuses, if the rpm's start to drop any, maybe due to existing bearing damage, it can still run, but the furnace will shut down.
    __________________________________________________ _______________________
    “Experience is a hard teacher because she gives the test first, the lesson afterwards". - Vernon Law

    "Never let success go to your head, and never let failure go to your heart". - Unknown

  8. #8
    Join Date
    Sep 2012
    Posts
    373
    The inducer has gotten a little bit louder lately. The motor looks black too.

  9. #9
    Join Date
    Jul 2006
    Location
    Virginia
    Posts
    4,614
    it would be a good time to replace the furnace
    We really need change now

  10. #10
    Join Date
    Sep 2012
    Posts
    373
    We probably will replace the whole furnace when the inducer fails since it is oversized. It really depends on price of course. I might post a picture of the inducer in our current furnace so you can see the blackness on the motor. I don't know if the blackness has anything to do with the overheating or not.

  11. #11
    Join Date
    Sep 2012
    Posts
    373
    Here's the image: Name:  DSC00351.jpg
Views: 222
Size:  40.6 KB I took this pic while the tech was here for the tune-up. Is the blackness on the motor normal?

  12. #12
    Join Date
    Mar 2005
    Location
    burlington county n.j.
    Posts
    9,708
    where the arrow is pointing at is black when the motor is new.
    below that at the windings shows no signs of over heating.

  13. #13
    Join Date
    Sep 2012
    Posts
    373
    Quote Originally Posted by t527ed View Post
    where the arrow is pointing at is black when the motor is new.
    below that at the windings shows no signs of over heating.
    Thanks for the input. I feel stupid now. It just kinda didn't look normal. Well at least I know now! I'm guessing that the tan color I see on some tiny areas of the motor is probably rust. The motor is original from the furnace when it was installed. Both companies did find the inducer running on high amps.

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