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Thread: Inline fuse

  1. #1
    Join Date
    Jul 2004
    Location
    Cincinnati Ohio
    Posts
    16
    I'm working on a 2.5 ton rheem ac unit. There is a inline fuse after the transfomer and before the computer board. I have 124v on the line side and 27v @ the transformer. the unit will run for 12 hours then blow the inline fuse if it is replaced it will run for another 12 hours then blow. The transformer has been replaced and i'm still pulling 27v is the bouard bad or a'm I getting a voltage spike.

    Thanks

    Cribbetr

  2. #2
    Join Date
    Dec 2002
    Location
    Houston,Tx.
    Posts
    16,121
    Originally posted by cribbetr
    The transformer has been replaced
    Thanks Cribbetr
    I don't believe it was ever a transformer issue might start checking your low voltage wires for shorts and could also be the 24 volt coil in your contactor outside, could be the board but I doubt it.
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  3. #3
    Join Date
    Jun 2003
    Location
    Florida
    Posts
    9,548
    Do you have the correct size fuse? Only a Short/ high amp draw will cause the fuse to blow...check wires&connections.
    If everything was always done "by the book"....the book would never change.

  4. #4
    Join Date
    Feb 2003
    Location
    Huntsville,AL
    Posts
    4,125
    switch to Slo-Blow type
    transformer VA rating?
    you will also protect the transformer by having fuse in 120v!

    be aware that the 0.25x1.25" fuses are rated 32V above 8 amperes! -- unless ceramic -- most electronic distributors carry them --

    or HOSFELT.com

  5. #5
    Join Date
    Feb 2005
    Location
    Dothan, Al
    Posts
    3,453
    My quess is the board is bad - heating up for twelve hours, causing slow incease in current draw until fuse blows - possible caused by 'tracking' across the 'lands' or just s chip overheating.

    Hope this helps,
    Richard

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