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  1. #1
    Join Date
    Jul 2009
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    58

    460v to 24v transformer tripping

    The 460v to 24v 4amp transformer overload keeps tripping about every 4 hours. Unit is a dx system. Any ideas why. Thanks

  2. #2
    Join Date
    Apr 2011
    Posts
    114
    could be many things but I would start looking for a short in wire somewhere. Had one similar where a valve would open in a pharmaceutical plant and move the 24v and it happened to have a rip on the wire and it would trip. Took forever to find this out as the damn valve that would move was only opened and closed for a short period of time.

  3. #3
    Join Date
    Jan 2010
    Location
    Toronto,Ontario Canada
    Posts
    355
    the first thing you look at is the max fused/breaker size on unit and see if it has the correct one in. then start looking at the motors see if they are over amping then see any loose connections.. start eliminating components!
    Get er Done!

    Do what has to be done
    when it has to be done
    as well as it has to be done
    And doing it all the time.

  4. #4
    Join Date
    Oct 2009
    Location
    God's country - Shenandoah Valley, VA
    Posts
    339
    Quote Originally Posted by wika_boy View Post
    The 460v to 24v 4amp transformer overload keeps tripping about every 4 hours. Unit is a dx system. Any ideas why. Thanks
    Quote Originally Posted by akelesis View Post
    the first thing you look at is the max fused/breaker size on unit and see if it has the correct one in. then start looking at the motors see if they are over amping then see any loose connections.. start eliminating components!
    Akelesis, did you read his post carefully? He said the 4 amp transformer overload keeps tripping. That overload is in the 24V circuit. What would the breaker or the motor in the 460V circuit have to do with that?

    Wika_boy, are you a DIY. An HVAC tech would know how to diagnose that.

  5. #5
    Join Date
    Nov 2006
    Location
    Southeastern Pa
    Posts
    17,952
    Quote Originally Posted by wika_boy View Post
    The 460v to 24v 4amp transformer overload keeps tripping about every 4 hours. Unit is a dx system. Any ideas why. Thanks
    New transformer?

    Correct tap?

    Measured load on secondary?
    [Avatar photo from a Florida training accident. Everyone walked away.]
    2 Tim 3:16-17

    RSES CMS, HVAC Electrical Specialist

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  6. #6
    Join Date
    Feb 2006
    Location
    USA
    Posts
    4,381
    once you verify correct voltage on the primary side of your xfmr id check the loads like already mentioned. you could ohm each holding coil but depending on size of system & amount of components it might take a while but it beats repeat trips to location

  7. #7
    Join Date
    May 2004
    Location
    SE Pennsylvania
    Posts
    903
    Measure the amp draw on the 24 volt side as the unit runs, somethings coil could be overheating then shorting or the amp draw is close to the breaker trip point that it takes that long to heat up and trip. Had an unloader coil do that a while back, unit would run a good 30 minutes.

  8. #8
    Join Date
    Feb 2012
    Location
    Upstate SC
    Posts
    84
    Quote Originally Posted by hvac69 View Post
    Measure the amp draw on the 24 volt side as the unit runs, somethings coil could be overheating then shorting or the amp draw is close to the breaker trip point that it takes that long to heat up and trip. Had an unloader coil do that a while back, unit would run a good 30 minutes.
    I've run in to the same situation with run contactors. Thank you NAFTA!

  9. #9
    Join Date
    Jan 2010
    Location
    Toronto,Ontario Canada
    Posts
    355
    Akelesis, did you read his post carefully? He said the 4 amp transformer overload keeps tripping. That overload is in the 24V circuit. What would the breaker or the motor in the 460V circuit have to do with that?

    Wika_boy, are you a DIY. An HVAC tech would know how to diagnose that.

    sorry buddy. i misread the thread. i was too quick to respond. sorry guys i do look like an idiot now
    Get er Done!

    Do what has to be done
    when it has to be done
    as well as it has to be done
    And doing it all the time.

  10. #10
    Join Date
    Nov 2007
    Location
    Mississippi
    Posts
    1,307
    I'd check the amp draw on the secondary side with all components energized. If not overamping, replace thermostat wire. Sometimes that is the quick fix.

  11. #11
    Join Date
    Oct 2010
    Location
    Baton Rouge, LA
    Posts
    1,113
    Check the time delay. I have seen time delays do this several times.
    If you're too "open" minded, your brains will fall out.
    Artificial intelligence is no match for natural stupidity.

  12. #12
    Join Date
    Oct 2002
    Posts
    1,260
    Drop a fuse on each control load. See which load is popping fuse. Y1 , G, Y2 loads.

  13. #13
    Join Date
    Dec 2011
    Location
    Kansas City
    Posts
    4
    I'm with timjimbob. Best way to start isolating the problem since it is intermittent.

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