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Thread: CONTACTOR FUSE BLEW UP WHEN THE COMMPRESSOR IS ABOUT TO RUN (Trane Chiller)

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    CONTACTOR FUSE BLEW UP WHEN THE COMMPRESSOR IS ABOUT TO RUN (Trane Chiller)

    Good day, I have a Trane chiller RTAC230Tons, the fuse (5 amp) that supply 110V to the contactor through the Starter board control, blew up the moment the compressor is about starting or when it has started. its the starter board that switches the contactor ON/OFF with 110V from the big transformer. It displayed phase loss alarm on the adaptive view, I have checked the contactor, clean the contact terminal. Please help out.

  2. #2
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    Call a professional
    The toy chest is officially full ... I got a new toy..... 2007 Aston Martin V8 Vantage and yes it still gives me goosebumps
    You bend em" I"ll mend em" !!!!!!!
    I"m not a service tech.. I"m a thermodynamic transfer analyst & strategic system sustainability specialist
    In the new big shop , greasin', oilin' . tweakin' n shinin' !!

  3. #3
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    Tell me how you checked the contactor?

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    Thread Starter
    1. All the terminals are ok, even cleaned them and continuity test ok for all terminals
    2. The coil resistance test around 9 ohms
    3 I replaced the fuse with 5amps, and 7amps, all blew up but when I replaced with 10amps the contactor energised and its working since yesterday..

    I want to ask why a contactor coil of 110V 5amp fuse suddenly start blowing up fuse of 5amp, 7amp but work with 10amp fuse, could it be that the continue hotness of the coil has affected the coil and made the coil to draw higher current?
    Thanks for the prompt reply....

  5. #5
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    What level of apprenticeship are you?

    Is it the lug terminals that you cleaned?

    What is magnetic domain to you with out looking it up. Be honest. It’s for your benefit.

  6. #6
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    Quote Originally Posted by Joseph4blues View Post
    1. All the terminals are ok, even cleaned them and continuity test ok for all terminals
    2. The coil resistance test around 9 ohms
    3 I replaced the fuse with 5amps, and 7amps, all blew up but when I replaced with 10amps the contactor energised and its working since yesterday..

    I want to ask why a contactor coil of 110V 5amp fuse suddenly start blowing up fuse of 5amp, 7amp but work with 10amp fuse, could it be that the continue hotness of the coil has affected the coil and made the coil to draw higher current?
    Thanks for the prompt reply....
    S T O P

  7. #7
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    Thread Starter
    The contact terminals of the contactor

  8. #8
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    Why would you use a larger fuse 😲

  9. #9
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    With this analogy would a 20amp be even better 🤔

  10. #10
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    Click image for larger version. 

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    Quote Originally Posted by VTP99 View Post
    With this analogy would a 20amp be even better ��
    Why bother with a fuse when a nail cut to length will do .
    The toy chest is officially full ... I got a new toy..... 2007 Aston Martin V8 Vantage and yes it still gives me goosebumps
    You bend em" I"ll mend em" !!!!!!!
    I"m not a service tech.. I"m a thermodynamic transfer analyst & strategic system sustainability specialist
    In the new big shop , greasin', oilin' . tweakin' n shinin' !!

  11. Likes VTP99, Filthy, lions_lair liked this post.
  12. #11
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    Quote Originally Posted by Joseph4blues View Post
    The contact terminals of the contactor
    This is not wise to do. This changes the profile and removes the coating of the contacts. This will fail soon enough.

    Now you have not answered any of my other questions.

    It is nothing to be ashamed of if your just a first level
    Apprenticeship candidate. We all started somewhere.

    I cannot help you with out knowing your level, in the trades.

    1- to know how to explain the information.
    2- to know that your not a diy trying to kill your self working on something you shouldn’t be.

    Voltage/ohms kills.

    Pressure ruptured, injury or kills.

    So I cannot continue till I know.

    And if you keep going on with what your doing, your going to have a very Bad day.

  13. #12
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    Thread Starter
    Good day, Im a Data Center Facility Engineer, Im in charge of chiller maintenance.
    After replacing with 5amps and 7amps fuses, they blew up also, so I tested with 10amps. The 10amps fuse worked.

    I wanted to ask why a contactor coil of 110V 5amp fuse suddenly start blowing up fuse of 5amp, 7amp etc, but work with 10amp fuse, could it be that the continuous hotness of the coil might have affected the contactor coil and made the coil to draw higher current?
    Thanks for the prompt reply....

  14. #13
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    You have a low voltage control short. Going bigger will not help you . Only make things worse

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    Quote Originally Posted by Joseph4blues View Post
    Good day, Im a Data Center Facility Engineer, Im in charge of chiller maintenance.
    After replacing with 5amps and 7amps fuses, they blew up also, so I tested with 10amps. The 10amps fuse worked.

    I wanted to ask why a contactor coil of 110V 5amp fuse suddenly start blowing up fuse of 5amp, 7amp etc, but work with 10amp fuse, could it be that the continuous hotness of the coil might have affected the contactor coil and made the coil to draw higher current?
    Thanks for the prompt reply....
    So you not in the trades.

    Your a power engineer.

    Not really supposed to be stinking your hands in the panel.

    So even a 5th class Power engineer knows basic electricity. But only to operate and maintain the equipment and building envelope.

    So, you need to call your repair company when that contactor fails.

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