Results 1 to 5 of 5
  1. #1
    Join Date
    Mar 2005
    Posts
    701
    Post Likes

    YORK YCUL condensing unit

    Hello all , i posted this in commercial , but thought id post here as well , as very similar controls to chiller model

    YORK YCUL condensing unit millennium controls circ 2002

    trying to change out lcd display and ribbon cable ordered from jci w m/n s/n

    existing one works but not well , had found 1 pin eroded , suspect from moisture , poor door seal,

    well got new one and doesnt want to work? my question is has anyone else had this problem , is there a compatibilty issue?

    also anyone had nuisance mp/hpco alarms with these units?


    thanks in advance stan


    http://cgproducts.johnsoncontrols.co...150.63-NM5.pdf
    Last edited by stanbyyourword; 07-31-2015 at 08:30 AM.
    Keep it simple to keep it cool!

  2. #2
    Join Date
    Dec 2014
    Location
    New Mexico
    Posts
    91
    Post Likes
    Try checking the orientation of the ribbon cable, I have gotten it it plugged in back wards before . Sometimes the cable looks like it should be plugged one way and it should folded over and then plugged in, look at old cable and how it was folded at display end .
    Are the alarms on both systems on just one. Go thru history and see if transducer head pressure is high at time of trip or normal . If normal could be bad mechanical high pressure switch or it is motor protector. Could be the CR relay as well.


    Sent from my iPhone using Tapatalk

  3. #3
    Join Date
    Mar 2005
    Posts
    701
    Post Likes
    hi thanks for reply, I did try the cable both ways , one way it did give me a solid black line , but this was the direction that seemed wrong , so put it back. hmm strange one. as you know it only plugs into processor plug one way.

    the mp/hp is odd one too i jumped the safety circuit stilll trips, possibly this relay, i did check all the contacts switching , I think i`ll try swapping the other ckt control relay for test.
    Keep it simple to keep it cool!

  4. #4
    Join Date
    Dec 2014
    Location
    New Mexico
    Posts
    91
    Post Likes
    Do you have another unit to try display in? Could be connection at main board for the alarm , you said that there was corrosion on the one cable. May have lost the whole board.

  5. #5
    Join Date
    Mar 2005
    Posts
    701
    Post Likes
    no I wish I did, finished testing , erratic operation processor ckt 2 so hard wired 1 ckt2 compressor and lls off ckt 1 temporary, back to display , Im fairly sure the board isn't compatible with it , so new processor and eprom to quote, thanks for replys
    Keep it simple to keep it cool!

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  

Related Forums

Plumbing Talks | Contractor MagazineThe place where Electrical professionals meet.
Quality Home Comfort Awards