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  1. #27
    Join Date
    Mar 2018
    Posts
    8
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    Quote Originally Posted by pecmsg View Post
    Pressures without temperatures are worthless!
    Temps are in the OP

  2. #28
    Join Date
    Mar 2015
    Location
    Hamersville, Ohio
    Posts
    2,479
    Post Likes
    "30 feet below the air handler and the lineset is about 75 feet long."

    That keeps "Shooting off flares" in the back of my mind.

    Another thing, & I haven't read through the other pages yet, but, .... How did this unit perform, up to when you got the call?

  3. #29
    Join Date
    Dec 2013
    Location
    TN
    Posts
    193
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    Did you do your loop in the linesets at AH?

  4. #30
    Join Date
    Dec 2013
    Location
    TN
    Posts
    193
    Post Likes
    And what size suction line did you use?

  5. #31
    Join Date
    Sep 2016
    Posts
    18
    Post Likes
    You didn't actually give the pressures, but assuming they are normal for this application, there is a phenomenon that could cause this. You said 30' up, is the rest of the line set in a hot attic? If the attic temp. is above condensing (saturation) temp. then the subcooled liquid could be flashing in the liquid line before getting to the TXV, creating less heat absorption in the evaporator and higher SH. TXV's on newer equipment are pressure limiting to prevent overloading compressors in high heat load situations as well. So if the evaporator is running warm, (which would account for the not cooling complaint), the TXV flow would max out, keeping more refrigerant in the condenser, hence higher SC readings. Essentially, the evaporator has more vapor than it should due to the TXV getting hot liquid/vapor mix, and the excess refrigerant ends up in the condenser. Make sense? The answer, if this is the case, would be to insulate the liquid line in the attic.

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