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  1. #1
    Join Date
    Jul 2003
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    218
    On a txv system with a recip. compressor do you need a start capacitor?

    On a scroll compressor with a txv do you need a start capacitor?

  2. #2
    Join Date
    Jul 2006
    Posts
    1,091
    Yes and yes... kick start

  3. #3
    Join Date
    Jan 2004
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    PA
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    68,758
    Scrolls don't need a start cap.
    But it doesn't hurt if they have one.
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  4. #4
    Join Date
    Jul 2006
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    1,091
    beenthere is right

  5. #5
    Join Date
    Jun 2006
    Posts
    628
    Do I have this confused, mostly I hear about using a "hard start kit" with a txv, and all compressors us a combined run/start cap don't they?

  6. #6
    Join Date
    May 2006
    Location
    Philadelphia, PA
    Posts
    1,398
    txv + hard start kit = mostly, but not always
    all compressor use combined run/start cap - nope

  7. #7
    Join Date
    Mar 2005
    Location
    burlington county n.j.
    Posts
    9,763
    have never put start kit on scroll compressor. 99.99% of my units are lennox scroll units with txv. have been using scroll units since they came out around 1990.

  8. #8
    Join Date
    Jul 2006
    Posts
    1,091
    The refrigerant does not equalize when a reed compressor is matched with a txv, therefor the compressor starts under a load... ya need a kick

    I was was wrong about the scroll. I should have yep and nope.

  9. #9
    Join Date
    Dec 2002
    Location
    Houston,Tx.
    Posts
    16,121
    Originally posted by t527ed
    have never put start kit on scroll compressor.
    Ruud and Rheem puts one on "every" one of there 14 seer units must be doing it for some reason, or it could be maybe they just like to spend the extra money, yea thats it.
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  10. #10
    Join Date
    Mar 2005
    Location
    burlington county n.j.
    Posts
    9,763
    Originally posted by mrbillpro
    Originally posted by t527ed
    have never put start kit on scroll compressor.
    Ruud and Rheem puts one on "every" one of there 14 seer units must be doing it for some reason, or it could be maybe they just like to spend the extra money, yea thats it.

    have never seen or put one on a lennox unit. maybe they are using different txv's???? as i said i have been installing lennox units with scrolls since 1990. to date i may have had 6 compressor failures.

  11. #11
    Join Date
    Jul 2006
    Posts
    613
    I think I undestand the reason for a "hard start kit" for 14 SEER units with a TX valve based on coments from here.

    I was taught that a hard start kit was a bandaid for worn compressors essentially on their way out.

    Why arent NEW high SEER units designed with a cap or compressor to handle the designed start up load?

    Old compressor technology?

    Just wondering...

  12. #12
    Join Date
    Jan 2004
    Location
    PA
    Posts
    68,758
    Recip compressors for A/C, H/P applications are made with low torque starting motors, Even with a TXV that equalizes most of them need a start cap.


    Start, run caps are seperate things. Duel caps are run caps for both the compressor and fan.


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  13. #13
    Join Date
    Jul 2003
    Posts
    218
    thanks for the comments

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