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  1. #1
    Join Date
    Oct 2011
    Location
    Bromsgrove, Worcs
    Posts
    33
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    York YCAS1215 Current/HP/MPX



    Hello,

    I have been working on a York YCAS1215 chiller which has 4 screw compressors. I am getting a Current/HP/MPX fault on 1 of the circuits.
    I have checked for this fault before and have found various reasons (HP cutout, Motor Protection) and I am used to the basic circuit from the relay board through the HP, MP and then to the Texas Instrument controller. My problem this time is that when the display says the compressor is running, the contactors do not pull in. The power for the contactors starts at the relay board from terminal 20 and then goes to the HP, Mp etc. However, when the unit tries to start, you can hear the relay on the board click but there's no power from terminal 20 so the unit will not start and after 3 attempts it trips on Current/HP/MPX. Any Ideas?



  2. #2
    Join Date
    Aug 2006
    Location
    England
    Posts
    495
    Rep Power
    21

    Re: York YCAS1215 Current/HP/MPX

    Your texas instrument module is faulty

  3. #3
    Join Date
    Oct 2011
    Location
    Bromsgrove, Worcs
    Posts
    33
    Rep Power
    0

    Re: York YCAS1215 Current/HP/MPX

    I'm going back next week so i'll try your suggestions then - Thanks

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