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Thread: Airedale Fault

  1. #1
    Davmarr's Avatar
    Davmarr Guest

    Airedale Fault



    HI
    Anyone help, been looking at an airedale ACC 120 D chiller 2 comps 4 stage. unit runs ok then "faults" the comps unload and shut down, as they are doing this the fault clears and it all starts up again run for a bit and faults again. No indication on the Trend panel what the alarm is , all running pressurs are ok when its running. The prob is its just not telling us the fault is.



  2. #2
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    Re: Airedale Fault

    Is this chiller controlled from a BMS system, if so are the run request signal cables healthy?

    Pavilion

  3. #3
    MTX's Avatar
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    Re: Airedale Fault

    The only fault that I have had on these chillers that dont show as a fault are oil pressure. Also check the control protocol is it in local on/off?

  4. #4
    Brian_UK's Avatar
    Brian_UK is offline Moderator I am starting to push the Mods: of RE Site Moderator : and general nice guy
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    Re: Airedale Fault

    As MTX says, check the control strategy.

    Some controls will ramp up and down in percentage points. The cooling could get turned ON at say 65% of signal.

    The temperature then changes slightly and the signal drops to 62% and the cooling is turned OFF again.

    This is the worst type of control for compressor operation. You need a wide deadband to ensure that the compressors get a decent run time.

    I've lost two compressors before due to that type of control.
    Brian - Newton Abbot, Devon, UK
    Retired March 2015

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