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  1. #1
    Join Date
    May 2006
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    Hitachi Screw Compressor Retrofit



    Hello!
    Has anyone had any experience of retrofitting a water chiller with Hitachi 6002SC-H screw compressor running with R22? We have a leak on the system and it seems pointless to recharge with R22R post repair. According to some websites Hitachi ship the compressors with POE so oil return can't be a problem with R22. We will change the oil during the retrofit but again not sure what grade/make is best. By the Hitachi UK say they have no experience using retrofits with this compressor so any help would be greatly appreciated!



  2. #2
    Join Date
    Aug 2006
    Location
    England
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    Re: Hitachi Screw Compressor Retrofit

    hi hitachi screws on r22 used bp enersyn lps 68 grade oil
    hitachi on r407c the 6005 sc h compressor uses ester 220 grade

    what refrigerant are you going to use

  3. #3
    Join Date
    May 2006
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    uk
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    Re: Hitachi Screw Compressor Retrofit

    Hi Ghaz,
    I'm at a a complete loss with refrigerant choice. We've tried R422D on large recips but the performance has not been good and I'm not sure if anyone has used it in a screw compressor. R407C sounds like a good option but I'm worried that glide may be a problem. Dupont are looking at options for us via BOC so we'll see what refrigerant they propose,

  4. #4
    Join Date
    Aug 2006
    Location
    England
    Posts
    469
    Rep Power
    16

    Re: Hitachi Screw Compressor Retrofit

    With 407c use ester 220 oil other wise the compressor wont pump up pressure

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