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  1. #1
    Join Date
    Jun 2007
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    Leicester
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    R134A Running Pressures



    Hi

    Apologies if this is in the wrong thread!

    We have been asked to look at a walk in freezer operating on on R134A i have never been to look at a freezer running on R134A what sort of running pressures should i be looking for to get the freezer down to -18oC? Currently the freezer is only achieving around -8oC

    Am i right in thinking the suction should be around 1psig?

    Thanks in advance for any help



  2. #2
    Join Date
    Jan 2008
    Location
    Somerset
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    75
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    Re: R134A Running Pressures

    Hi Borodave,

    Forget about pressures and use temperature. You should be evaporating at about -25'C for a freezer. So look for -25'c on your blue gauge on the 134a scale.

    To keep it simple, use these rules of thumb:
    Freezer = SST of -25'c
    Coolroom = SST of -5'c
    AC = SST of +5'c

    Using these 3 temperatures you will be able to work with any refrigerant.

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