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  1. #1
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    Ciat PRS1 control problem



    Hi!

    Due to a faulty display on a "ciat LW M 1600z 2" I was forced to replace it. After the switch I have noticed that the machine can't manage to get down to the desired setpoint (as it did before). The machine goes down to 0.5 degrees from setpoint but never stops. I reckon it's a problem with the capacity regulation because the capacity used lowers when the water temp lowers but it never gets down to setpoint. It may be a small problem but as it never stops it can't switch the running compressor either so I'm currently only using one comp all the time. I have checked every parameter I can think of but I must be missing something. (Another weird thing is that I cant access the parameter p24 which is the parameter for min position of slide valve.)

    Has anyone had the same problem before? Anyone got any pointers?

    Kind regards

    Fredrik



  2. #2
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    Re: Ciat PRS1 control problem

    Your compressor is CSH or HSKC?

  3. #3
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    Re: Ciat PRS1 control problem

    It's a HSKC (two of them).

  4. #4
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    Re: Ciat PRS1 control problem

    HSKC doesnt have slide valve. You mentioned your leaving water T is just 0.5 C below setpoint?

  5. #5
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    Re: Ciat PRS1 control problem

    I really think it got a slide valve. I can be wrong about the model because I just checked google and compared to a pic I got. Which do you think I have? 4961.jpg

    No temp only gets down to 0,5 C over setpoint but never gets the down to setpoint as it did before the display switch.

  6. #6
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    Re: Ciat PRS1 control problem

    It is HSKC. Controls capacity opening bypass inside compressor. You control water on inlet or outlet?

  7. #7
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    Re: Ciat PRS1 control problem

    Oh okay, I just took for granted that there was a slide valve. We control on inlet temp.

  8. #8
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    Re: Ciat PRS1 control problem

    Play with P36, P37.

  9. #9
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    Re: Ciat PRS1 control problem

    Okay, tanks! I will try that

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