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  1. #1
    Join Date
    May 2007
    Location
    california
    Posts
    223

    capacitor sizing-replacement???

    Last week I was on a job that had blown 35/5 mfd capacitor on acondenser unit. In a pinch we replaced it with a 40/5 - will this cause premature failure or any other electrical problems..The voltage rating was compatible....

  2. #2
    Join Date
    Mar 2005
    Location
    Houston, Texas
    Posts
    11,864
    I think you already know the answer to this question.
    You have the posts, why not apply for pro?

  3. #3
    Join Date
    Sep 2003
    Location
    Portland.OR
    Posts
    313

    FOR AWHILE ....GET THE RIGHT ONE

    Caps are usually 20% tolerance value, so a 35 -or + would be up or down 7 uf.
    Therefore 42 would still be OK. [35+7=42] Some have 10% tolerance depending on the circuit. 40 will work if its a 20% value on the old unit, dig it outa the bad parts box. Read the label...make the decision.

    Next time in the area put in the proper size, if its a 10% cap.

    caps can short/open/change value/or the ESR changes

    Over and out!!

  4. #4
    Join Date
    Sep 2002
    Location
    Northeast Ohio
    Posts
    4,842
    Carry a multi-cap and save the hassle
    A good HVAC tech knows how, an educated HVAC tech knows why!

    DEM


  5. #5
    Join Date
    Feb 2008
    Location
    Waffleville
    Posts
    10,339
    Quote Originally Posted by jmiles View Post
    Last week I was on a job that had blown 35/5 mfd capacitor on acondenser unit. In a pinch we replaced it with a 40/5 - will this cause premature failure or any other electrical problems..The voltage rating was compatible....
    will be ok, just increased starting torque a bit and lost some efficiency of the motor
    If Guns Kill People, Do Pencils Misspell Words?

    http://www.youtube.com/watch?v=An2a1...eature=related

    Before we work on artificial intelligence why don't we do something about natural stupidity?

  6. #6
    Join Date
    Feb 2008
    Location
    Waffleville
    Posts
    10,339
    Quote Originally Posted by heaterman View Post
    Carry a multi-cap and save the hassle
    if this was in pro area..... cost prohibitive, can i say that?
    If Guns Kill People, Do Pencils Misspell Words?

    http://www.youtube.com/watch?v=An2a1...eature=related

    Before we work on artificial intelligence why don't we do something about natural stupidity?

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