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  1. #1
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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
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    Sep 2009
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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 08:08 PM.

  3. #3
    Join Date
    Dec 2007
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    australia
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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.

  4. #4
    Join Date
    Mar 2014
    Location
    South Africa
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    Re: Retrofitting York YCAS screw chillers from R22 to R407c

    Thank you gents. It seems that it shouldn't be too difficult as the systems already have POE oil in the compressors.

  5. #5
    Join Date
    Dec 2007
    Location
    australia
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    Re: Retrofitting York YCAS screw chillers from R22 to R407c

    You can find a procedure here, I'm assuming accurate.

    https://www.honeywell-refrigerants.c...07c&download=1

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