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  1. #1
    Join Date
    Nov 2012
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    Minnesota
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    Carrier 19XRV "high line voltage" alarm. ISM bad?

    Trouble shooting a customers 19XRV. Prestart failure on High line voltage. Panel shows 200-1000v jumps around. Incoming is rock steady at 480v.
    Trouble shot panel with power off, now alarms with reverse phase?
    Power and phasing is normal, anyone seen this? I'm guessing the ISM board. But that is a $2100 guess, Any help is appreciated

    Greg

  2. #2
    Join Date
    Jan 2008
    Location
    East of big city prices.
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    Me thinks you need to remove your pricing per the rules.

  3. #3
    Join Date
    Nov 2012
    Location
    Minnesota
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    Thread Starter
    I don't see how to edit? Oops.

  4. #4
    Join Date
    Aug 2002
    Location
    Greenville SC
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    Most likely the ISM

  5. #5
    Join Date
    Nov 2010
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    Im sure you already fixed this but i have replaced 2 isms for the same reason in the past 5 years on the same 19xrv. Just thought id post for others

  6. #6
    Join Date
    May 2012
    Location
    California
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    Most likley ISM

  7. #7
    Join Date
    Aug 2007
    Location
    Southern NJ
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    You could even have something as simple as a loose connection on the communication wiring connecting all the control boards, or corrosion on a pin connecting a sensor to a board. In my experience I have noticed Carrier chillers to be very prone to nuisance faults that do not actually exist. I would check every connection on every board before replacing components. I wish you luck.

  8. #8
    Join Date
    Apr 2011
    Location
    Southern Indiana
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    36
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    What the ISM the problem? I'm having similar issues.

  9. #9
    Join Date
    May 2012
    Location
    California
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    What is yours doing?

    Sent from my SM-G930V using Tapatalk

  10. #10
    Join Date
    Apr 2011
    Location
    Southern Indiana
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    I'm almost positive that it has a bad ISM. Voltage on the CVC display are all out of wack. "Actual Line Voltage" is giving a reading of 528 Volts. Line Voltage Phase1 602v, phase 2- 524v, phase 3 458 volts. I know that's wrong because I have checked it on the panel and all voltages and phase are correct there. I keep getting "Phase Reversal Trip", Line Voltage Imbalance", 1M Aux Contact Faul". Different alarms.

  11. #11
    Join Date
    Jan 2013
    Location
    United Kingdom
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    I would scope the 3 phase input voltage waveform and look for transients and other potential issues on the line, also check the control voltage is within specified parameters and components are not overheating.

  12. #12
    Join Date
    May 2012
    Location
    California
    Posts
    590
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    Bad ism

    Sent from my SM-G930V using Tapatalk

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