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  1. #1
    Join Date
    Aug 2013
    Posts
    16

    Display Freezer High Super Heat

    Service call for a low temp display freezer. Customer stating not reaching desired set point.

    Found a small leak at High Side flare fitting.
    Added 25oz of R404A.

    Checked the system;
    404a
    Ambient temp 80
    Suction pressure 14
    Liquid line pressure 275
    Super Heat Approx 90
    Sub Cooling 10
    All fans were running and coils clean
    Box pulled to set point (-10 degrees)

    Found a small at High Side flare fitting.
    Added 25oz of R404A.

    This is throwing me off... I adjusted the unit using sub cooling. Should I be concerned with the super heat?
    just looking for some input.

  2. #2
    Join Date
    Aug 2002
    Location
    Southold.calm
    Posts
    5,678
    What metering device,

    X-Valve or Cap tube?

  3. #3
    Join Date
    Aug 2013
    Posts
    16
    TXV

    It is a Carrier ULG80BC-5, Three Door Glass Freezer (Bottom Mounted Compressor).

  4. #4
    Join Date
    Aug 2002
    Location
    Southold.calm
    Posts
    5,678
    Quote Originally Posted by Tbone39 View Post
    TXV

    It is a Carrier ULG80BC-5, Three Door Glass Freezer (Bottom Mounted Compressor).
    Forget SC with a receiver.
    Clear the SG and adjust the SH

  5. #5
    Join Date
    Aug 2012
    Location
    willowick ,oh
    Posts
    261
    is there a cpr valve on it. whats the actual #'s on the txv valve itself.Just want to see what kind of valve you got.

  6. #6
    Join Date
    Aug 2013
    Posts
    16
    Yes to the CPR Valve - 10PSIG
    Not sure what #'s are for the TXV.

  7. #7
    Join Date
    Aug 2013
    Posts
    16
    I am not sure if I was clear or not… but the unit is operating normal since I have serviced it (About 4 days ago).

  8. #8
    Join Date
    Jul 2012
    Location
    Western KY
    Posts
    1,221
    Self contained RI freezer. All the time u took to fiddle and think about it you could have pulled charge evacuated and weighed the exact proper charge in. Not picking but I never guess on charge on RIs when the charge weight is on the data plate. Just saying

  9. #9
    Join Date
    Aug 2013
    Posts
    16
    Since the unit is working now, do I go back, recover, pressure test, evacuate, and weigh in charge. Or should I just leave it since it is operating properly (for now). I am trying to be proactive.

  10. #10
    Join Date
    Aug 2002
    Location
    Southold.calm
    Posts
    5,678
    Compressor manufactures call for 20 – 40*f SH at the compressor to prevent damage.

  11. #11
    Join Date
    Aug 2013
    Posts
    16
    And of course a 90*f Super Heat is bad... Could contaminates cause a high super heat?

  12. #12
    Join Date
    Jul 2011
    Location
    Lehigh Valley, PA
    Posts
    447
    How can you possibly have 90F superheat? On a working freezer?

  13. #13
    Join Date
    Oct 2011
    Location
    Chicagoland Area
    Posts
    4,615
    Quote Originally Posted by Tbone39 View Post
    Since the unit is working now, do I go back, recover, pressure test, evacuate, and weigh in charge. Or should I just leave it since it is operating properly (for now). I am trying to be proactive.
    If your customer wants to pay for it, go right ahead. Otherwise hope for the best. As far as the SH, first I'd calibrate your thermometer and gauges because somethings not right. You're telling us you essentially have a 70degree suction line at the pump? That pump won't last long and I'm surprised the unit is cooling like you say it is.
    Officially, Down for the count

    YOU HAVE TO GET OFF YOUR ASS TO GET ON YOUR FEET

    I know enough to know, I don't know enough
    Liberalism-Ideas so good they mandate them

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