Page 1 of 2 12 LastLast
Results 1 to 13 of 25
  1. #1
    Join Date
    May 2013
    Location
    Baton Rouge, La
    Posts
    42

    1075rpm 1/2hp condenser fan motor bad

    On a recent call, i found the condenser fan motor bad. I have seen motors do this before but not known why. When off, the motor spins freely. When power is applied the motor locks tight and does not spin. The motor is not too expensive and has been replaced. I would like to know how and why this happens...

  2. #2
    Join Date
    Apr 2013
    Location
    New York City
    Posts
    21
    Who's the manufacture of the motor?

  3. #3
    Join Date
    May 2013
    Location
    Baton Rouge, La
    Posts
    42
    this one was by 1 Source
    but as i say i have seen it before and i believe it was OE

  4. #4
    Join Date
    May 2009
    Location
    In the Hudson Valley of New York
    Posts
    1,694
    Bad bearings, magnetic field locks it up when power is applied by pulling it into the windings.

  5. #5
    Join Date
    Mar 2009
    Location
    Mid-Mo
    Posts
    3,429
    Did you ohm out the windings by chance?

  6. #6
    Join Date
    Nov 2007
    Location
    Tucson, AZ
    Posts
    89
    the real question might be what made it fail. was it over charged too much heat was the wrong capacitor used. was it the right Hp rating. voltage drop?

  7. #7
    Join Date
    May 2009
    Location
    In the Hudson Valley of New York
    Posts
    1,694
    What is the cause of bad bearings? Purely mechanical failure, maybe the fan was not balanced? Or maybe the OP just had a bad capacitor?

    Bearing Failure
    My Blower motor Hums, Spins free but won't run?

    Bearing Failure
    One of the most common problems in furnace blowers and light duty motors that use an all angle sleeve bearing is that as that bearing wears and becomes looser the magnetic field that makes the rotor assembly go around is able more easily to pull that rotor assembly against the stationary iron preventing it from rotating while power is applied. The easiest way to determine if this is the issue is to firmly grab the motor shaft while holding the motor against a bench or allowing the mounting to hold it, and see if there is movement side to side or up and down against the side of the bearings. NOTE: it is normal for the shaft of these motors to have end play- that is to be able to push the shaft in toward the motor or pull it out slightly, however there should be no play side to side. One other possibility for the failure of these motors to run, while humming, is a bad motor run capacitor. If there is an externally mounted capacitor on this motor, you can easily remmove it & bring it in we will be glad to test it for you.
    http://www.enyartelectric.com/index....&id=2&Itemid=8

  8. #8
    Join Date
    May 2013
    Location
    Baton Rouge, La
    Posts
    42
    The run cap checked good.
    The when no power was applied the blade spun smooth as butter on a hot skillet
    could be a imbalance issue but the fan appears to be undamaged, i know this does not mean one of the weights are all present but it sounds well while running.
    as far as ohm windings, i had no reason to, because i knew it was bad anyhow.
    ill check it later when i get off. its in the back of the truck still. Let ya know.
    Voltage was not out of balance

  9. #9
    Join Date
    May 2009
    Location
    In the Hudson Valley of New York
    Posts
    1,694
    No big deal, motors will fail, maybe the OE was made in China or just old? It is nothing to over analyze, I just put some anti seize on the shaft for next time so the blade comes off easy.

  10. #10
    Join Date
    May 2013
    Location
    Baton Rouge, La
    Posts
    42
    yess indeed!
    changing the same part repeatdly on the same equipment is a great way to keep the pocket fat but does not keep the business name shiny.
    matter of fact this motor came with a one year warranty and we changed it 14 months ago.
    personally i am somewhat embarassed.
    I pride myself in what i do and if my repairs dont last i feel it has something to do with install error.
    Not necessarily, i kno, but i still would like to learn from my mistakes and not make money off them.
    Thank you for your opnion Mr. Eugene.

  11. #11
    Join Date
    May 2009
    Location
    In the Hudson Valley of New York
    Posts
    1,694
    14 months ago, was it made it China? If so it tell your customer, hopefully they understand?

    I got over the fact that parts being supplied went to crap about 10 years ago, and the trend is getting worse on bigger items, it is not your fault or mine. Blame the corporations with the politicians in their pockets. Hopefully the politicians and CEOs have multiple failures on their durable goods, and I hope they get uncomfortable while waiting for the repeat failures due to crappy imported parts.

  12. #12
    Join Date
    May 2013
    Location
    Baton Rouge, La
    Posts
    42
    Funny guy!!!!
    ill keep that in mind next time im on a call 7:30 on a friday!!!!

  13. #13
    Join Date
    Sep 2005
    Location
    Atlanta GA area
    Posts
    20,287
    Quote Originally Posted by 02JeepKing View Post
    yess indeed!
    changing the same part repeatdly on the same equipment is a great way to keep the pocket fat but does not keep the business name shiny.
    matter of fact this motor came with a one year warranty and we changed it 14 months ago.
    personally i am somewhat embarassed.
    I pride myself in what i do and if my repairs dont last i feel it has something to do with install error.
    Not necessarily, i kno, but i still would like to learn from my mistakes and not make money off them.
    Thank you for your opnion Mr. Eugene.
    One's pocket will not stay fat long if the business name becomes tarnished...

    Probably a different wording of a Proverb or Chinese saying.
    GA-HVAC-Tech

    Galatians 2:20-21; Colossians 1: 21-22 & 26-27; 3:1-4; Romans Ch's 5-6-7-8

    2 Chronicles 7:14

    Quality work at a fair price with excellent customer service.

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  
Comfortech Show Promo Image

Related Forums

Plumbing Talks | Contractor Magazine
Forums | Electrical Construction & Maintenance (EC&M) Magazine
Comfortech365 Virtual Event