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  1. #1
    Join Date
    Jul 2004
    Location
    Poughkeepsie, Ny
    Posts
    632
    Have a system on an 84 deg. day

    I'm there for a yearly service.

    Liq. 165
    Suc. 80

    Has a TXV.

    Sub cooling tells me that @ 163 deg. I should have 78 deg. liq. temp w/10 deg subcooling.

    These were the temps.

    85.1 - 91.0
    Added ref.
    82.7 - 89.7
    Added ref.
    81.5 - 92
    Stopped adding ref.
    This was over about a 15 min. period of time. Suc. and Liq. did not change. what's happening?
    Happiness is the only good. The time to be happy is now. The place to be happy is here. The way to be happy is to make others so.
    -Robert Green Ingersoll

  2. #2
    Join Date
    Aug 2002
    Posts
    490

    Lightbulb

    suction pressure 80
    head pressure 165
    condenser inlet temp 84
    suction line temp 81
    high line temp 92

    the superheat is high 33 the pressure difference is small
    could be a mismatch
    causes
    oversized evap. coil
    the evap has more heat absorbing capacity than the condenser can handle. check the coil model number and the condenser model compare capacities.

    or weak undersized compressor
    the compressor output is to small for the system rating or the compressor valves are leaking.

  3. #3
    Join Date
    Jan 2005
    Location
    daytona florida
    Posts
    76


  4. #4

    Stated Conditions...

    Originally posted by atufano
    Have a system on an 84 deg. day

    I'm there for a yearly service.

    Liq. 165
    Suc. 80

    Has a TXV.

    Sub cooling tells me that @ 163 deg. I should have 78 deg. liq. temp w/10 deg subcooling.

    These were the temps.

    85.1 - 91.0
    Added ref.
    82.7 - 89.7
    Added ref.
    81.5 - 92
    Stopped adding ref.
    This was over about a 15 min. period of time. Suc. and Liq. did not change. what's happening?
    Your indicating normal suction pressures with abnormal high superheat, you may be slightly under charged, have an undersized metering device or the RA system is being compromised with severe infiltration into the system.
    AllTemp Heating & Cooling

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