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  1. #1
    Join Date
    Oct 2011
    Location
    Toronto
    Posts
    35

    New install, problem at start up.

    I dont do very much refrigeration, A friend of mine asked me to install a walk in box for his cottage to hang game in

    We put the box up and Installed all the equipment as per the engineers sizing etc

    Its a water cooled unit 404a.

    I can get the box down to desired 38 degrees but sometimes during a cycle it goes off on high pressure. Superheat at LL is 10, I dont see much of a temp difference between inlet and outlet water ( inlet is cold)

    Any ideas?

  2. #2
    Join Date
    May 2010
    Location
    Brooklyn, NY
    Posts
    99
    what's the information on the condenser unit, what's the high pressure at the time it cuts off, is there any high pressure cutoff?, need more infos

  3. #3
    Join Date
    Oct 2011
    Location
    Toronto
    Posts
    35
    the high pressure cut off set point is 400 psi, the unit is controlled by a pressure differential switch

  4. #4
    Join Date
    Jul 2012
    Location
    Western KY
    Posts
    1,221
    What's your water source? Is it on a well or municipal? Do not turn the high pressure switch cut out setting up without checking condenser for a pressure relief, that can get expensive.

  5. #5
    Join Date
    Apr 2010
    Location
    So Cal
    Posts
    74
    When you say water cooled, I am going to assume that you have a unit with a water cooled condenser. Have you verified that water is actually moving through the condenser barrel. What are the exact water inlet/outlet temps. Is this a used unit, or new?

  6. #6
    Join Date
    Oct 2011
    Location
    Toronto
    Posts
    35
    Its a new unit, and you would be right to assume it is a water cooled condenser- by municipal water, Incoming water temperature is 42 degrees. Outlet is no more than 50.

    I'm not adjusting the high pressure cutoff.

  7. #7
    Join Date
    Apr 2010
    Location
    So Cal
    Posts
    74
    What are the operating pressures? Did you leak check with nitrogen and pull a good vacuum (measured with micron gauge)? Do you have a valve on the water outlet that you could throttle the water flow with. If so, you could pinch down the valve while monitoring the temps and see if you get better heat exchange. It's unrelated, but I recommend installing a y strainer on the water inlet. I have seen these barrels fill up with sediment over time and really degrade performance.

  8. #8
    Join Date
    Feb 2009
    Location
    Tallahassee, FL
    Posts
    6,048
    Are you checking liquid pressure and the switch is sensing discharge?

  9. #9
    Join Date
    Jun 2009
    Location
    DFW, TX
    Posts
    673
    If it is a pump down system, it may be overcharged and shutting off during pump down cycle.

    What are system pressures?

    And 10* superheat at the "LL" - what is the "LL"?

  10. #10
    Join Date
    May 2010
    Location
    Canada
    Posts
    835
    Quote Originally Posted by trippintl0 View Post
    If it is a pump down system, it may be overcharged and shutting off during pump down cycle.

    What are system pressures?

    And 10* superheat at the "LL" - what is the "LL"?
    Liquid Line?

  11. #11
    Join Date
    Oct 2011
    Location
    Toronto
    Posts
    35
    It's up and running! Made some adjustment on incoming water

  12. #12
    Join Date
    Jun 2009
    Location
    DFW, TX
    Posts
    673
    Quote Originally Posted by eddiegoodfellar View Post
    Liquid Line?
    How do you check superheat on the liquid line???? That's why I'm confused..

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