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  1. #1
    Join Date
    May 2007
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    North Carolina
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    24

    why do capacitors fail

    Changed alot of Dual caps lately maybe just can't disipate heat

  2. #2
    Join Date
    Jun 2003
    Location
    Hell Hole Swamp
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    4,180
    If they are swollen it was due to overheating

  3. #3
    Join Date
    Jan 2004
    Location
    Lancaster PA
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    68,603
    Quote Originally Posted by lovecoldair View Post
    and keep in mind the 440 caps are alot more expensive than the 370 caps ,
    Not around here. Not much of a difference in price, and we charge accordingly.
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  4. #4
    Join Date
    Jun 2003
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    Hell Hole Swamp
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    Quote Originally Posted by JBM1000 View Post
    China!
    Actually most OEM are GE's made in Mexico, The Chinese replacements seem to be more reliable, time will tell

  5. #5
    Join Date
    Dec 2002
    Location
    Toledo, Ohio, United States
    Posts
    12,914
    Goodmans fault ,who else could it be?
    No Heat No Cool You need Action Fast

  6. #6
    Join Date
    Jan 2004
    Location
    Lancaster PA
    Posts
    68,603
    Quote Originally Posted by tyrone_bak View Post
    Trane equipment.. I think.

    I turned off everything because I heard that you can damage the compressor.

    Do you think my fan went out?

    How much do one cost?
    Leave it off.

    The tech will tell you how much it cost.
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  7. #7
    Join Date
    Jan 2004
    Location
    Lancaster PA
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    68,603
    Now try a run capacitor.

    Also. Next time your working on a compressor, read the voltage across the run capacitor while the compressor is running.

    It will not be 240 volts.
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  8. #8
    Join Date
    Jun 2007
    Location
    Greenwood Indiana (Indianapolis)
    Posts
    420
    Capacitors used to be filled with pcb's and seldom went bad. Now their filled with dialectricts (Can't spell) and yes they over heat. Most generally are the systems that are overcharged. Yes lennox caps. go bad but what about bryants?

    I'm sure everyone here knows how to take 2-3 or more capacitors and wire them to get a certain mfd. reading.

    Are those Turbo universal caps. any good?

  9. #9
    Join Date
    Jun 2007
    Location
    Greenwood Indiana (Indianapolis)
    Posts
    420

    Smile

    its ok to replace a 370vac cap with a 440vac cap but never the other way!!! Also all Lennox require 440vac.
    If you combine say a 35mfd with a 10 mfd to get a 45 mfd. do it in parrell and make sure they are both the same vac!

  10. #10
    Join Date
    Jun 2003
    Location
    Hell Hole Swamp
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    Quote Originally Posted by cep a/c View Post
    Truck, I never said it would be 240. I said it would not be above 370 volts. Have a nice day.
    I tested several today after reading this thread


  11. #11
    Join Date
    Jan 2004
    Location
    Lancaster PA
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    68,603
    Quote Originally Posted by VOMranger View Post
    Here's what we were taught on replacing caps-

    Use the exact one if you can
    Voltage must be equal to or greater
    Start cap- mF equal to but not more than 20% greater
    Run cap- mF +/-10%

    In parallel, the sum of the caps equals the total cap (20+15=30)
    In series- (C1*C2) / (C1+C2)=C
    Fix your math, 20 + 15 = 35.
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  12. #12
    Join Date
    Jun 2003
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    Hell Hole Swamp
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    Quote Originally Posted by Jabarco View Post
    Made in China maybe?


    Who cares?


    Jabs
    Exactly

    /thread

  13. #13
    Join Date
    Jul 2009
    Location
    South Carolina
    Posts
    3,350
    Its got to be how the capacitors are made today that causes all the excessive failure rates. No different than copper evaporator coils corroding out after a few years. The manufacturers tell us its the heat that causes the caps to fail & the
    chemicals in homes causes the copper to corrode. If you ever look at the size of the old capacitors that rarely ever went bad & compare them to the modern no pcb caps its laughable. They wouldn't even fit in the cabinets. The heat that is the major cause of failures today never seemed to bother the old ones. I guess it never got hot 20 years ago.
    Gary
    -----------
    http://www.oceanhvac.com
    An engineer designs what he would never work on.
    A technician works on what he would never design.

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