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Thread: Frozen Lines

  1. #1
    Join Date
    Sep 2011
    Posts
    58

    Frozen Lines

    I need help, R22 18 Ton Rheem 2 stage 3 phase unit with a frozen low side problem...

    One of the compressors is running at 15 Superheat and seems to have no problem at all..

    The second compressor's low side keeps freezing up and therefore affects compressor 1.

    Here are some stats taken earlier today...
    Dry bulb 92F

    27.3 Degrees on Low Side / 51 Psi
    154 Degrees on High Side / 340 Psi
    Superheat approx 5

    The pressure was lower on the high side when I first got there and when I added freon it got up to 350, the low side temperature does not seem to improve at all with the added refrigerant..

    I have checked the evaporator, clean, no restriction on the return...

    Any Ideas?

  2. #2
    Join Date
    Mar 2007
    Location
    north carolina
    Posts
    32
    sounds like txv problem or restricted drier

  3. #3
    Join Date
    Jul 2012
    Location
    Southwest
    Posts
    114
    recover and change the powerhead of the txv, also replace the drier. If thats a heat pump, verify you dont have a restriction at a check valve.

  4. #4
    Join Date
    Sep 2011
    Posts
    58
    In my original post I did not mention (sry) that I left the unit running but there was no frost at the point that I left, also the inside had hit 75degrees, which it had not before...

    This is a bar & I went back out there yesterday because manager said, it was 80 degrees around 6pm, I asked him to shut off the cooling mode and keep the fan running while I got there, which he did.. or did he???

    When I got there though (45min) there was no ice, not even water or moist near or on any of the lines and the evap was pretty dry as well., This is a rooftop package unit I am talking about, it was just funny that with approx 88degrees ambient temperature I had not found "any" evidence of frozen lines, gave me the impression the unit had not been on for at least a few hours, which made sense because this place does not open during the day really.

    Well anyway, make a long story short, this time I just went there to turn the damn thermostat on to 76degrees and stayed there for at least an hour to see about that freezing up issue and nada, pressures and temperatures seemed just fine... During this time, I asked the person in charge not to set the temperature too low. I think all in all what was affecting this system was just poor thermostat skills..

    This morning I found out that system worked like a charm last night so.. I thought I come back and share this with you guys, thanks for your responses..

  5. #5
    Join Date
    Nov 2007
    Location
    Mississippi
    Posts
    1,401
    51 low/ 340 high = unit not cooling properly

  6. #6
    Join Date
    Nov 2007
    Location
    California
    Posts
    15
    Quote Originally Posted by deon View Post
    sounds like txv problem or restricted drier
    Copy that!

  7. #7
    Join Date
    Aug 2012
    Location
    MA
    Posts
    39
    Definetly restricted somewhere.. I would recover that charge and blow some nitrogen through there and see what happens...

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