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  1. #1
    Join Date
    Nov 2012
    Location
    Arlington, TX
    Posts
    11

    Blowing transformer in air handler

    I am at my wits end with this air handler. I have replaced the the transformer 7 times in the last 3 months. I have replaced every component in the control box, the heat strip and replaced the control box itself. I've also replaced the thermostat in hopes that this would resolve the problem. The system is a First Company Horizontal Fan Coil HX series pumping R22 through a Bryant 3 ton condenser. This problem begin during the summer. The resident would get at least a week of no problems with the condenser and then the transformer would blow. We are now in heating season and as soon as the 10Kw strip is energized, there goes yet another transformer. Any ideas of what may be causing this aggravation and why it isn't happy with heating or cooling?

  2. #2
    Join Date
    Oct 2004
    Location
    Central WA
    Posts
    1,311
    Sorry, we cannot give DIY advice here. I will tell you this, however: fuses cost less than transformers.

  3. #3
    Join Date
    Nov 2012
    Location
    Arlington, TX
    Posts
    11
    Quote Originally Posted by cjpwalker View Post
    Sorry, we cannot give DIY advice here. I will tell you this, however: fuses cost less than transformers.
    I am not a DIY. I am HVAC certified and have been for the past 2 years. Thanks for your reply, anyways.

  4. #4
    Join Date
    Dec 2002
    Location
    Houston,Tx.
    Posts
    15,506
    Quote Originally Posted by micsand View Post
    I am not a DIY. I am HVAC certified and have been for the past 2 years.
    Then you should know to fuse the transformer until you find the issue and you would not be replacing them.
    __________________________________________________ ____________________________
    “Reality is merely an illusion, albeit a very persistent one.” –Albert Einstein

    “Experience is a hard teacher because she gives the test first, the lesson afterwards.”-Vernon Law

  5. #5
    Join Date
    Oct 2010
    Location
    Baton Rouge, LA
    Posts
    1,083
    I could tell you what to CHECK but because of your status does not Verify you as a certified professionAl we would be breaking the rules. I hope your TRANSFORMER issue gets resolved.
    If you're too "open" minded, your brains will fall out.
    Artificial intelligence is no match for natural stupidity.

  6. #6
    Join Date
    Nov 2012
    Location
    Arlington, TX
    Posts
    11
    Thank you cjpwalker and Mr Bill for the advice. I appreciate your responses and will do so. Just been a long 3 days of trying to isolate this problem. I have run into this issue several times with other units and have been successful with correcting the problem. Been going through my notes and talking with other techs. I'll get it solved, just need to figure what I missed.

  7. #7
    Join Date
    Sep 2008
    Location
    Western PA
    Posts
    24,993

  8. #8
    Join Date
    Nov 2006
    Location
    Southeastern Pa
    Posts
    17,020
    Quote Originally Posted by micsand View Post
    Thank you cjpwalker and Mr Bill for the advice. I appreciate your responses and will do so. Just been a long 3 days of trying to isolate this problem. I have run into this issue several times with other units and have been successful with correcting the problem. Been going through my notes and talking with other techs. I'll get it solved, just need to figure what I missed.
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  9. #9
    Join Date
    Oct 2002
    Posts
    1,135
    Fuse every load, then determine where your problem is.
    Your trouble shooting skills are poor. Be more systematic. Learn, advance to next step. Replacing same part over and over is wasting your bosses time and inventory.

  10. #10
    Join Date
    Nov 2012
    Location
    Arlington, TX
    Posts
    11
    I appreciate your response. I'll get it. It hasn't beat me yet. :-)

  11. #11
    Join Date
    Nov 2012
    Location
    Arlington, TX
    Posts
    11
    I appreciate your candor. Your are absolutely right and is wasting my time as well. I am still learning and improving everyday. Thanks.

  12. #12
    Join Date
    Dec 2002
    Location
    Houston,Tx.
    Posts
    15,506
    Quote Originally Posted by micsand View Post
    I appreciate your candor. Your are absolutely right and is wasting my time as well. I am still learning and improving everyday. Thanks.
    Hey, I can remember back in the early 70's when I was kicking off, I would carry 10 transformers because I had to learn from someone to fuse them also.
    __________________________________________________ ____________________________
    “Reality is merely an illusion, albeit a very persistent one.” –Albert Einstein

    “Experience is a hard teacher because she gives the test first, the lesson afterwards.”-Vernon Law

  13. #13
    Join Date
    Nov 2008
    Location
    baltimore
    Posts
    26
    never understood why all transformer don't come with built-in breaker.

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