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  1. #27
    Join Date
    Aug 2004
    Location
    North Richland Hills, Texas
    Posts
    14,914
    Quote Originally Posted by BURL-REF View Post
    I agree with a liquid line solenoid. Not pumping the unit down, just closing when the call is satisfied. Install it in the liquid line close to the evaporator. That will keep liquid from migrating on the off cycle.
    Quote Originally Posted by Snapperhead View Post
    I've seen them at the indoor coil and at the OD unit .... i guess it doesnt really matter
    For a long line set application, with the liquid line and evaporator above the condenser, it is best to have a LL solenoid at the outdoor unit to prevent liquid draining back into the condenser and displacing the vapor in the condenser coil.
    If the condenser coil and discharge line are full of liquid when the compressor starts, there will be a huge spike in the head pressure for a short time, sometimes even rather violent vibrations. I've seen trip discharge line mounted high pressure switches, and cause cracks in the discharge line due to the vibration.
    Scroll compressors sound especially angry starting under those conditions.

    A non bleed TXV will take care of things at the evaporator coil end of the lines.
    If more government is the answer, then it's a really stupid question.

  2. #28
    Join Date
    Jun 2011
    Location
    Seattle WA
    Posts
    1,225
    Yes, this scroll was certainly pissed off by all the liquid. It scared the crap out of me, I left the system off until the solenoid was installed. Now it works like a charm
    America; first we fight for our freedom,
    then we make laws to take it away.

    -Alfred E Newman

  3. #29
    Join Date
    Sep 2007
    Location
    State College, PA
    Posts
    1,022
    Here is a PDF on the issue from Carrier.
    Attached Images Attached Images
    Can someone please explain to me -
    Why is there never enough time to do it right the first time, but plenty of time to do it twice?


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