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  1. #1
    Join Date
    Sep 2002
    Location
    Virginia
    Posts
    2,184

    Using a run cap in place of start cap

    I just left a job and only had a run cap on the truck .... sad yes I know.

    Small Walkin box with a copeland, the start cap was a 88-106MFD which popped the oil out the top.

    I used a 10uf run cap just to see if it would get him running, and it did just fine it seems.

    Im hoping this will get him thru today until I can swith it out tomorrow for the correct cap.

    It didnt get hot or anything on startup, and the wires are not getting hot either ... so I felt pretty comfy leaving it that way.

    Anyone ever tried this ????

  2. #2
    Join Date
    Jun 2006
    Location
    New Jersey
    Posts
    4,090
    Quote Originally Posted by Snapperhead View Post
    I just left a job and only had a run cap on the truck .... sad yes I know.

    Small Walkin box with a copeland, the start cap was a 88-106MFD which popped the oil out the top.

    I used a 10uf run cap just to see if it would get him running, and it did just fine it seems.

    Im hoping this will get him thru today until I can swith it out tomorrow for the correct cap.

    It didnt get hot or anything on startup, and the wires are not getting hot either ... so I felt pretty comfy leaving it that way.

    Anyone ever tried this ????
    What happened when you shut it down and tried to start it again? Like it would when cycling.

  3. #3
    Join Date
    Jun 2003
    Location
    Virginia
    Posts
    376
    10 uf seems quite low considering it had a 88-108 on it. I would have placed a bunch of caps in series to get as close to the original value as I could....

  4. #4
    Join Date
    Sep 2002
    Location
    Virginia
    Posts
    2,184
    It was pulling 45 amps dropping to 10 .... so I felt is was ok.

    I removed a leg from the relay and short cycled it a few times before leaving.

    I was amazed it worked, and probly crazy to try it .... but it did, and yes I am a little bit

  5. #5
    Join Date
    Jul 2009
    Location
    In a mechanical room....
    Posts
    1,879
    Have a hard start kit on your truck next time.
    “It takes courage to grow up and turn out to be who you really are.”

    - E.E. Cummings

  6. #6
    Join Date
    Nov 2006
    Location
    Southeastern Pa
    Posts
    14,458
    I like the idea of having a good start kit with a potential relay on the truck.

    I would not place a cap in service without it being close (20%) to the specification.

    I would say that you were lucky. All of the variables might not work in your favor next time.

  7. #7
    Join Date
    Jul 2009
    Location
    In a mechanical room....
    Posts
    1,879
    Quote Originally Posted by timebuilder View Post
    I like the idea of having a good start kit with a potential relay on the truck.

    I would not place a cap in service without it being close (20%) to the specification.

    I would say that you were lucky. All of the variables might not work in your favor next time.
    Those pot relays on hard start kits and or caps have gotten me out of more jams than a slim jim.
    “It takes courage to grow up and turn out to be who you really are.”

    - E.E. Cummings

  8. #8
    Join Date
    Feb 2010
    Location
    Northeast, PA
    Posts
    235

    A great tool on the truck

    I keep couple of those Turbo Caps, usually gets me out of a jam.
    Never tried what you did before, MFD Range to far out for me to trust operation, but it worked for you.

  9. #9
    Join Date
    Mar 2009
    Location
    Mid-Mo
    Posts
    2,289
    Quote Originally Posted by chrishvacman View Post
    Have a hard start kit on your truck next time.
    X2

  10. #10
    Join Date
    Dec 2005
    Location
    Virginia Beach, Va.
    Posts
    249
    SPP6 is handy to have, I also you them to replace PTC’s in a bind.

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