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Thread: True prep table

  1. #14
    Join Date
    Mar 2006
    Location
    cincinnati, ohio
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    258
    I think their taking the pans out at night. Why does it matter if pans are in there? I will check and clean Condensor tomorrow. Thanks for all your help!! If you think of anything else please let me know.
    Knowledge comes with experience

  2. #15
    Join Date
    Oct 2011
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    Chicagoland Area
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    Pans need to stay in as an insulator. Box will not reach temp and compressor will not stop running. Similar to keeping a door open
    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
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  3. #16
    Join Date
    Mar 2006
    Location
    cincinnati, ohio
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    258
    Thanks 2sac! That may be the problem. Because its lasted all week and then it sees to freeze up the day after they've been closed for two days. I'll definitely check that out!! I know my head pressure is high but just couldn't understand the week of running fine and then coming back after being closed for two days being froze up.
    Knowledge comes with experience

  4. #17
    Join Date
    Jun 2009
    Location
    DFW, TX
    Posts
    664
    Its freezing up because it doesn't ever get the evaporator coil down to the 15*F that its looking for to cycle off, so it runs forever.

    Fix the refrigeration problem. Get cap tube specs from True. Replace it and use a C032CAPT drier or the C052-cap-tt-hh drier. Strap cap tube to suction line like OEM. Make sure clean condenser, clean evaporator, good airflow, all fan shrouds in place, etc.

    If a larger drier is used you may need to add a couple of ounces over nameplate to compensate.

    When you work on this unit, you put your temp probe in the coil and watch how fast coil pulls down. Also if you replaced the OEM evap fan which moves very slow, with a normal 9watt fan, it will move to much air and coil will run warm and can freeze the food.

    Good luck. True tech support is helpful and doesn't mind helping you troubleshoot. They know their products very well.

  5. #18
    Join Date
    Mar 2006
    Location
    cincinnati, ohio
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    258
    Thanks everyone! I will go there this evening and check all of that. Why does cap tube have to be strapped to suction line?
    Knowledge comes with experience

  6. #19
    Join Date
    Oct 2011
    Location
    Chicagoland Area
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    To guarantee subcooled lquid is reaching the coil. Attach what you can to the suction line. This is a must. I usually use silver tape, then wrap it all with foam tape. If you have room, coil up the leftovers in the evaporator rather than the condenser section. I like to coil mine around my Maglite before installing it. looks neat and is compact.
    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

  7. #20
    Join Date
    Mar 2003
    Location
    Cochrane, AB
    Posts
    604
    I recently looked at 3 TUC-72 prep tables where the evap fans cycle off with the compressor. Naturally all three are freezing up and have very poor temperature control. Are these supposed to be wired this way? (somewhat related to this post?)

  8. #21
    Join Date
    Jun 2009
    Location
    DFW, TX
    Posts
    664
    Yes the TUC's are usually wired that way from the factory... unless someone rewires it... like me...

  9. #22
    Join Date
    Jun 2003
    Location
    Chicago, IL
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    4,384
    if the cap tube is not strapped to the suction line, the liquid will start flashing earlier in the tube, which effectively increases the restriction provided by the tube. If you are not able to attach the tube, you can shorten it by about 8-12 inches to provide a similar flow rate.


    a good way to attach it is aluminum tape

  10. #23
    Join Date
    Jul 2011
    Location
    Lehigh Valley, PA
    Posts
    427
    Your head pressure is much too high using R134. You did say 250psi? I typically see 140-170psi in a warm kitchen. This problem must be solved. My guess would be you have an overcharge and your cap tube still has a restriction. Did you use a n2 purge? If you used a cheap copper spun dryer, you may need to replace it as someone else mentioned. I've seen those small dryers 'dust apart' internally and create restrictions that come & go.

  11. #24
    Join Date
    Jul 2011
    Location
    Lehigh Valley, PA
    Posts
    427
    Quote Originally Posted by nickellhead View Post
    When I first weighted it in my suction was at 3-4psi. That's why I overcharged. Shouldn't my suction on a refrigerator with 134 be around 25 psi?
    BTDT. You keep charging until the suction comes up near 18psi and before you know it your head is at 250psi. Still a restriction or a new one in the cap tube.

  12. #25
    Join Date
    Mar 2006
    Location
    cincinnati, ohio
    Posts
    258
    Ok. I cut 10" off cap tube. Purged with nitro. Weighted charge back in. My suction psi is 3psi and head is 125psi. My cabinet is 65 degrees and ambient is 85 degrees. System calls for 11oz and I weighted in 12oz. Pressures still don't seem right. Also I have the pans in top and the cap tube is taped to suction with foil tape and wrapped with insulation. I'm clueless at this point!
    Knowledge comes with experience

  13. #26
    Join Date
    Mar 2006
    Location
    cincinnati, ohio
    Posts
    258
    Also line temp 12" from comp is 84 degrees making it 90 degree super heat
    Knowledge comes with experience

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