Results 1 to 10 of 10

Thread: Chiller fault

  1. #1
    Join Date
    Feb 2004
    Location
    Australia
    Posts
    286
    Rep Power
    21

    Chiller fault



    Couldn't decide whether to post this thread here or in air conditioning section so did both

    York chiller, dreaded fault code-the usual LOW CURR/MP/HP. Chiller doesn't start on the problem circuit, just a couple of clicks and out on the fault, maybe after about 5 seconds. I thought it must have been the mecahnical HP switch when I got there, so had a look, but it had't tripped (pressed the reset but it was already in). Now usually I would have thought that a motor protection fault would not still be there as the compressor (a screw one) was not hot. If there had been another problem I had expected the chiller to start up for at least a few seconds before any current faults could have been detected, so as no current was ever drawn as the contactor never pulled in, I think perhaps the HP switch must have an open circuit fault.

    HELP please.
    Thanks
    James

    PS I was only asked to look on way home so due to time being a bit short was only there 30 minutes and then we had a thunderstorm.


    a problem shared is a problem halved

  2. #2
    Join Date
    Nov 2005
    Location
    New Zealand
    Posts
    550
    Rep Power
    19

    Re: Chiller fault

    Hi James, A few years ago we had a York Chiller that had to be reset everyday with the types of faults that you are seeming to get> One of my service guys came and said i dont no what happened. Anyway i went to the buiding in late afternoon looked around and discovered that the make up water in cooling tower couldn`t keep up with the water being evaporated, low and behold all it took was to open the make up water to full open and let the let the float valve control it. That was the cure no more nuisence calls

    regards Toosh

  3. #3
    Join Date
    Jul 2004
    Location
    england
    Age
    52
    Posts
    64
    Rep Power
    20

    Thumbs up Re: Chiller fault

    Its the auxiliary contacts on the top of contactor, it will fire in star and when she changes over it fails. Had loads of them go on me Trane have the same problem with Abb contactors, if its not the top set then try the cal5 at the sides they play up. Abb have changed them to cal18 i think.

  4. #4
    Join Date
    Mar 2001
    Location
    ireland
    Age
    53
    Posts
    1,471
    Rep Power
    41

    Re: Chiller fault

    james

    There are two hp in series, one may have water in or may just be faulty, link it out and try again. if you had a current or motor failure the module would be flashing a code.

    Alec

  5. #5
    Join Date
    Apr 2006
    Location
    England
    Posts
    15
    Rep Power
    0

    Re: Chiller fault

    I have changed many auxillary contacts on York chillers. The ABB auxillaries are very crudely made and fall apart at the drop of a hat.
    Last edited by colinmcmanus; 12-05-2006 at 12:16 PM.

  6. #6
    Join Date
    Apr 2006
    Location
    England
    Posts
    15
    Rep Power
    0

    Re: Chiller fault

    The fault shows up as a motor overload fault and can deceive you into looking for a motor fault or HP

  7. #7
    Join Date
    Feb 2004
    Location
    Australia
    Posts
    286
    Rep Power
    21

    Re: Chiller fault

    Thanks Guys

    It doesn't even start in star, the motor pulls nothing. After 5 seconds it flashes the fault on the panel. Theres no code on the blac box just flashes HA084, which I think is the setting for current.

    So because it doesn't actually start or try to, that's why I think it's the HP. The mechanical one doesn't seem to have tripped, the primary transducer I think might be the problem, or the machanical switch perhaps has an open circuit. All will be revealed next week.

    Thanks again Alec (this isn't the same as the last chiller)

    Cheers
    James
    a problem shared is a problem halved

  8. #8
    scuba6936's Avatar
    scuba6936 Guest

    Re: Chiller fault

    Hi Theres a control relay board sometimes located in the motor terminal box or in the panel depends which model of chiller but this is most likely to be at fault assuming you have checked HP wiring

    Charlie

  9. #9
    Join Date
    Oct 2004
    Location
    INDIA
    Age
    57
    Posts
    15
    Rep Power
    0

    Re: Chiller fault

    Quote Originally Posted by iceman007
    Couldn't decide whether to post this thread here or in air conditioning section so did both

    York chiller, dreaded fault code-the usual LOW CURR/MP/HP. Chiller doesn't start on the problem circuit, just a couple of clicks and out on the fault, maybe after about 5 seconds. I thought it must have been the mecahnical HP switch when I got there, so had a look, but it had't tripped (pressed the reset but it was already in). Now usually I would have thought that a motor protection fault would not still be there as the compressor (a screw one) was not hot. If there had been another problem I had expected the chiller to start up for at least a few seconds before any current faults could have been detected, so as no current was ever drawn as the contactor never pulled in, I think perhaps the HP switch must have an open circuit fault.

    HELP please.
    Thanks
    James

    PS I was only asked to look on way home so due to time being a bit short was only there 30 minutes and then we had a thunderstorm.
    James
    Is this chiller microcontrolled.If it is microconrolled pls check transformer ratio
    Thanks

  10. #10
    Join Date
    Jul 2001
    Location
    Good bay
    Posts
    50
    Rep Power
    24

    Thumbs up Re: Chiller fault

    Check wether the MCB installed for the Compressor Circuit is ON. If it has tripped the Circuit will trip indicating the fault. YORK chillers have a HP Switch installed at the compressor, try to reset that switch too or check wether it is stuck Open. If nothing else works check the I/O board for that particular circuit.

    All the best
    Setrite

    A group of Donkey's Led by a Lion can defeat a group of Lion's led by a Donkey

Similar Threads

  1. Dunham Bush Chiller Alarm
    By Regulator in forum Air Conditioning
    Replies: 11
    Last Post: 08-12-2010, 02:42 AM
  2. DIY aquarium chiller
    By BarraCuda in forum Technical Discussions
    Replies: 18
    Last Post: 06-10-2010, 11:02 PM
  3. carrier chiller fault codes
    By al in forum Air Conditioning
    Replies: 7
    Last Post: 20-07-2009, 10:10 PM
  4. York Screw Chiller How low will it go?????
    By bruceboldy in forum Industrial Compressors
    Replies: 11
    Last Post: 10-08-2007, 10:29 PM
  5. Chiller Fault
    By iceman007 in forum Air Conditioning
    Replies: 2
    Last Post: 13-05-2006, 07:23 PM

Posting Permissions

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