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  1. #1
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    Is R404A a problem in hot climate?



    Hi everyone!
    It's an ice cream counter running with R404A, not reaching lower than -13 deg C. Checked everything, the low pressure seems fine (32 psi while starting and 24 psi after running for 1 hour (TEX)). The superheat seems fine since the suction pipe is frozen until the compressor. There is no way to check the high pressure.
    We also have a vertical deep-freezer with R404A, everything seems fine but it doesn't reach -20 deg C.
    The ambient temperature here is around 28 deg C and sometimes reaches 35 deg C, could that be the problem?
    Have you ever heard of R404A machines giving trouble in hot and humid climates?

    Thank you!



  2. #2
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    Re: Is R404A a problem in hot climate?

    R-404 can work in any ambient, its all about how the system is designed.

  3. #3
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    Re: Is R404A a problem in hot climate?

    Not reaching - 13C when even left without products? The load is not too big for the counters (too warm and too often moved). The evaporators are defrosted timely and thoroughly?

  4. #4
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    Re: Is R404A a problem in hot climate?

    Give us full set of measurements and we will tell you where is the probable problem.

    Here is a list of the temps/pressures needed to troubleshoot a system:

    Evap air/water in temp
    Evap air/water out temp
    Low side pressure or saturation temp
    Suction line temp at evap outlet
    Suction line temp at compressor inlet

    Cond air/water in temp
    Cond air/water out temp
    High side pressure or saturation temp
    Liquid line temp at receiver or condenser outlet
    Liquid line temp at TXV inlet
    The more information provided the more accurate the diagnosis.
    Last edited by nike123; 27-07-2011 at 05:41 PM.

  5. #5
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    Re: Is R404A a problem in hot climate?

    Quote Originally Posted by arnout View Post
    There is no way to check the high pressure.
    You could measure temperature of u turns on condenser. Where there is no change in temperature there is saturation. That temperature is what we need.

  6. #6
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    Re: Is R404A a problem in hot climate?

    Try cleaning the condensers may help.

  7. #7
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    Re: Is R404A a problem in hot climate?

    Dear friends, thank you for your answers, i red them all with attention. Right now i have trouble with my Internet connection and am not able to answer to all decently, sorry about that. The counter started to make the breakers break(?) at starting of the compressor. We found out that there was no more gas inside the system, but water! We suspect a sudden gas lick at the level of the water "bucket" in which the discharge line was passing through. The compressor is still running, will try to take out all the water, dry it and fill it with new oil! : D

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