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  1. #14
    Join Date
    Feb 2007
    Location
    Central NJ
    Posts
    458
    any dual cap should be replaced if one side is bad. if you have to get one for each fan/compressor they need to share a common. it almost sounds like the compressor cap side was week or went dead and it opened on thermal overload or the fan stopped running on a call for cooling causing thermal overload. high amps during operation will expose potential weak/dead cap(s).
    You have to pay your due's before you pay the rent!

  2. #15
    Join Date
    Nov 2006
    Location
    Southeastern Pa
    Posts
    17,015
    Essentially, a "run" cap is a kind of a start cap, and we call it a "run" because it STAYS in the circuit while the unit RUNs. It is designed to stay in the circuit according to the design of the start windings, and the fact that it is oil filled, and can take the heat.

    A START cap is only in the circuit while the motor STARTS. It is removed using a relay of some type. It is a dry cap, and cannot take the heat of staying in the circuit like the run cap can.

    Hope that helps.

    My bet is united sold the OP a defective replacement cap.
    [Avatar photo from a Florida training accident. Everyone walked away.]
    2 Tim 3:16-17

    RSES CMS, HVAC Electrical Specialist

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  3. #16
    Join Date
    Jul 2007
    Location
    Virginia
    Posts
    5,021
    Quote Originally Posted by jnsrose View Post
    Rundawg I will definitely try that formula on the next one I come across.
    I sent you an email on capacitors that shows the testing of one while under load.
    Instead of learning the tricks of the trade, learn the trade.

  4. #17
    Join Date
    Jun 2002
    Location
    south jersey
    Posts
    1,088
    Quote Originally Posted by timebuilder View Post
    Essentially, a "run" cap is a kind of a start cap, and we call it a "run" because it STAYS in the circuit while the unit RUNs. It is designed to stay in the circuit according to the design of the start windings, and the fact that it is oil filled, and can take the heat.

    A START cap is only in the circuit while the motor STARTS. It is removed using a relay of some type. It is a dry cap, and cannot take the heat of staying in the circuit like the run cap can.

    Hope that helps.

    My bet is united sold the OP a defective replacement cap.
    Thanks Time Builder this helps alot.
    You need to put the phone down and get back to work!

  5. #18
    Join Date
    Jun 2002
    Location
    south jersey
    Posts
    1,088
    Quote Originally Posted by rundawg View Post
    I sent you an email on capacitors that shows the testing of one while under load.
    Email received. Thank you very much. I will save this an refer back to it often. Great info in this email. Again thanks to everyone for there help. This is why I love this site and been a member for so long.
    You need to put the phone down and get back to work!

  6. #19
    Join Date
    Nov 2006
    Location
    Southeastern Pa
    Posts
    17,015
    Back to the United on the Black Horse Pike in Mt. Ephraim, I presume....
    [Avatar photo from a Florida training accident. Everyone walked away.]
    2 Tim 3:16-17

    RSES CMS, HVAC Electrical Specialist

    AOP Forum Rules:







  7. #20
    Join Date
    Jun 2002
    Location
    south jersey
    Posts
    1,088
    Quote Originally Posted by timebuilder View Post
    Back to the United on the Black Horse Pike in Mt. Ephraim, I presume....
    That is exactly where I got the first one. The one that is in there now is an oem from Pierce Phelps. Unit has been running for a while now just did not know why it didn't with the first one. I am sure your right about the cap being bad like I said earlier I will have to find it at the bottom of my truck and test it under load.
    You need to put the phone down and get back to work!

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