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  1. #14
    Join Date
    Jan 2004
    Location
    Lancaster PA
    Posts
    67,717
    Well, at 109* OD temp, with that low vapor pressure and Sh.

    A guess would be, a restriction at the LLFD if its external to the condenser.
    Or, a restricted or dirty indoor pistion,

    You can refresh my memory.
    Did it ever cool right.
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  2. #15
    Join Date
    Jul 2006
    Location
    NW burbs of Detroit
    Posts
    6,058
    Quote Originally Posted by BigJon3475 View Post
    Just a guess but I'm thinking Arizona....
    My mistake. i was reading 21Degrees city and thought it was the OPs.

  3. #16
    Join Date
    Jul 2008
    Posts
    25
    Yes, for the last 7 years it had no problem going down to 77 or lower during the summer.

    This year, won't go below 80.

    I set the tstat at 81. It gets to 82/83, unit kicks on and cools it to 80 and shuts off. Goes back up to 82/83 and the cycle starts again. If I set it at 80, it just runs for hours.

  4. #17
    Join Date
    Jul 2008
    Posts
    25
    Quote Originally Posted by BigJon3475 View Post
    Just a guess but I'm thinking Arizona....
    Good guess!

  5. #18
    Join Date
    Jan 2004
    Location
    Lancaster PA
    Posts
    67,717
    Then your techs don't know what teh SH, and SC is telling them.
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  6. #19
    Join Date
    Jul 2008
    Posts
    25
    Quote Originally Posted by beenthere View Post
    Then your techs don't know what teh SH, and SC is telling them.
    Can you dumb that down to my level please? What does SH and SC stand for?

  7. #20
    Join Date
    Apr 2008
    Location
    Alberta Canada
    Posts
    2,246

    We use F-280

    Quote Originally Posted by hvaclover View Post
    My mistake. i was reading 21Degrees city and thought it was the OPs.
    We don't use Manual J here different core temp and cooling days. Codes are alittle different so We have to use F-280 Canadian Edition.
    Do it right the first time.

  8. #21
    Join Date
    May 2007
    Location
    DC Metro Area (MD)
    Posts
    3,368
    Quote Originally Posted by mbarizona View Post
    Can you dumb that down to my level please? What does SH and SC stand for?
    Superheat and sub-cooling. These are readings that your service tech can and should take. They're used in charging systems with refrigerant.

  9. #22
    Join Date
    Apr 2007
    Posts
    6,285
    Quote Originally Posted by RyanHughes View Post
    Superheat and sub-cooling. These are readings that your service tech can and should take. They're used in charging systems with refrigerant.
    and diagnosis.

  10. #23
    Join Date
    Jul 2008
    Posts
    25
    Thanks.

    Superheat is 8* and Sub-Cool is 13*. Don't know what those mean to me, but that is what is written down.

  11. #24
    Join Date
    Apr 2007
    Posts
    6,285
    He left out some very useful information that is needed in determining capacity.

  12. #25
    Join Date
    Sep 2002
    Posts
    12,195

    Can I explain the #'s or not ?

    .
    PHM
    --------
    The conventional view serves to protect us from the painful job of thinking.

  13. #26
    Join Date
    Jan 2004
    Location
    Lancaster PA
    Posts
    67,717
    Quote Originally Posted by Poodle Head Mikey View Post
    .
    I don't know, can you.

    Oh, you meant allowed to.

    You can explain them. And then if you get your hands slapped. We'll know were not allowed too.
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