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  1. #1
    Join Date
    Mar 2014
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    South Africa
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    Retrofitting York YCAS screw chillers from R22 to R407c



    It's been a while since I posted anything here.
    I am about to embark on changing some R22 YCAS chillers to R407c and was wondering if anyone out there has some experience they could share with regards to what problems I can expect to come up against. The local York supplier has told me that we will lose about 5 to 6% capacity but that is not a big problem as the units are already oversized for their duty.
    I would appreciate any advice regarding the above project. I have been reading some blogs where people are talking about o-rings require changing etc because they change shape with 407c?????



  2. #2
    Join Date
    Sep 2009
    Location
    Iran
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    61
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    Re: Retrofitting York YCAS screw chillers from R22 to R407c

    Hi
    main thing to change R22 to 407C
    is cleaning system ( very good) and putting POE type Oli in compressor .
    then after running set superheat
    Last edited by mbc; 15-02-2019 at 09:08 PM.

  3. #3
    Join Date
    Dec 2007
    Location
    australia
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    2,649
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    Re: Retrofitting York YCAS screw chillers from R22 to R407c

    Quote Originally Posted by Miked1 View Post
    It's been a while since I posted anything here.
    I am about to embark on changing some R22 YCAS chillers to R407c and was wondering if anyone out there has some experience they could share with regards to what problems I can expect to come up against. The local York supplier has told me that we will lose about 5 to 6% capacity but that is not a big problem as the units are already oversized for their duty.
    I would appreciate any advice regarding the above project. I have been reading some blogs where people are talking about o-rings require changing etc because they change shape with 407c?????
    “0” rings could definitely be a potential issue internal & external leakage.

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