Results 1 to 12 of 12

Thread: Rhoss Chiller

  1. #1
    Join Date
    Feb 2007
    Location
    Norfolk
    Posts
    8
    Rep Power
    0

    Question Rhoss Chiller



    Hi all

    I have been working on a Rhoss chiller Mod: TCAVB2045010247
    R407c screw compressors 2 circuits.

    Ive had Hp pressostat faults alm16
    lots of issues, ranging from blocked gomax to transducers, faulty main contactor as star delta config.
    The system starts ok usually and runs on head of about 15bar to 19bar.... Hp switch is set 25bar man reset.
    All of a sudden the circuits will shutdown and trigger a Hp pressostat alarm????? When I check the switch it hasn't broken, also thermistor module is ok.... seem to trip when pressures are ok.
    I have replaced the pcb for comp 2 which was faulty not outputing to run comp.....

    Would be grateful for any info advice if anyone has had similar faults.....
    I have called chiller4service but tech assist not much help.

    Regards
    Darren



  2. #2
    Join Date
    Oct 2007
    Location
    manchester
    Age
    50
    Posts
    5,707
    Rep Power
    45

    Re: Rhoss Chiller

    can u test the hp switch to see if it does trip at the 25 bar rated pressure- may be out of sync- best to test with nitrogen if possible

  3. #3
    Join Date
    Oct 2012
    Location
    Russia
    Age
    42
    Posts
    392
    Rep Power
    18

    Re: Rhoss Chiller

    Мммм, unit have big red button like "emergency shutdown" ? Usually press the button initiates an accident at high pressure and turning off the unit.

  4. #4
    Join Date
    Mar 2005
    Location
    Birmingham U.K.
    Age
    70
    Posts
    54
    Rep Power
    20

    Re: Rhoss Chiller

    Check the Hp switch circuit again,

    The Rhoss chiller I worked on a number of years ago had a dual HP switch.

    one part of the switch was auto reset, the other part of the switch was the manual reset.

  5. #5
    Join Date
    Feb 2007
    Location
    Norfolk
    Posts
    8
    Rep Power
    0

    Re: Rhoss Chiller

    Thanks for replying... Yes I guess I could test it when next on site but as its a mechanical HP/LP switch you can clearly see it hasnt tripped and electricall has a circuit through it.

  6. #6
    Join Date
    Feb 2007
    Location
    Norfolk
    Posts
    8
    Rep Power
    0

    Re: Rhoss Chiller

    No big button just standard carel keypad

  7. #7
    Join Date
    Feb 2007
    Location
    Norfolk
    Posts
    8
    Rep Power
    0

    Re: Rhoss Chiller

    Thats correct. Its an alco mechanical switch. Auto LP man HP but clearly not tripped Thanks anyway

  8. #8
    Join Date
    Oct 2007
    Location
    manchester
    Age
    50
    Posts
    5,707
    Rep Power
    45

    Re: Rhoss Chiller

    had an issue with an hitatchi vrf- occasionally alarmed on hp failure- but all checked out ok, after a week of swapping hp switch,sensors,pcbs finally suspected the alarm relay- swapped and no problems- weak coil was the culprit- system was 8 yr old - just thinking outside the box

  9. #9
    Join Date
    Jun 2009
    Location
    Lusk , Dublin
    Posts
    1,120
    Rep Power
    25

    Re: Rhoss Chiller

    Had this on a mercury unit with a Carel unit retro fitted to it.
    When it was fitted one of 4 available HP I/O's was used for a fault from a fan speed controller.
    Took a while to figure it out.
    Interrogate the controller programing and check for hp transducer limits !!
    Cheers
    Stu
    Last edited by stufus; 19-05-2013 at 10:52 PM.
    Tool's ? check ! Condom's ? check !
    If you can't fix it , f*ck it !!!

  10. #10
    Join Date
    Feb 2007
    Location
    Norfolk
    Posts
    8
    Rep Power
    0

    Re: Rhoss Chiller

    cool. Thanks for that I will change the parts ive condemned then will take another look.

  11. #11
    Join Date
    Feb 2007
    Location
    Norfolk
    Posts
    8
    Rep Power
    0

    Re: Rhoss Chiller

    thanks Stu good1

  12. #12
    Join Date
    Apr 2009
    Location
    israel
    Age
    50
    Posts
    778
    Rep Power
    18

    Re: Rhoss Chiller

    Hi
    if this unit uses a carel pco controller then the hp input 230 v is faulty , either id13h or id14h
    you can swap inputs and change to 24vac on the same input accordingly using the id13 or id 14 depending.
    good luck
    THE DEFINITION OF A SMART PERSON IS ONE WHOM LEARNS FROM HIS MISTAKES!!!

Tags for this Thread

Posting Permissions

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