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  1. #1
    Join Date
    Jul 2003
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    Thumbs up Carrier 30RA aquasnap

    Anyone expierenced alarm A140 phase reversal and existing chiller that has been running. schematic doesnt show phase protection. any recommendation other than swapping leads.and how does logic confirm phase reversal. any help will be great.

  2. #2
    Join Date
    Jan 2008
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    East of big city prices.
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    Suction pressure dropping within a few seconds? What part of Texas you around?

  3. #3
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    West Texas- El Paso area. Alarm happens intermittently, once in a while.

  4. #4
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    Quote Originally Posted by chillerguru View Post
    West Texas- El Paso area. Alarm happens intermittently, once in a while.
    Is it a single or dual circuit chiller?

  5. #5
    Join Date
    Jul 2011
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    I've seen this alarm on aquasnaps and package units that also use comfort link. I've resolved it by cleaning the transducers or once a broken wire on the suction presure swith. The controller looks at suction and discharge presure for 10 seconds and if they do not have a 50 psi difference it thinks the phases are reversed.

  6. #6
    Join Date
    Jun 2007
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    I have a 30RA055 ton aquasnap i'm working on and the chiller seems to be generating the T051, T052, T055 & T056 alarms after about 5 hours of run time. It seems as if the 5amp circuit breaker on the control panel trips right before these alarms are generated. I tried investigating but have no luck.

    Any ideas on what this could be?

  7. #7
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    Jan 2008
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    It's either a shorted contactor coil or a shorted wire. Put it in test mode and check it with an amp clamp.

    c
    Quote Originally Posted by LeroyForbes View Post
    I have a 30RA055 ton aquasnap i'm working on and the chiller seems to be generating the T051, T052, T055 & T056 alarms after about 5 hours of run time. It seems as if the 5amp circuit breaker on the control panel trips right before these alarms are generated. I tried investigating but have no luck.

    Any ideas on what this could be?

  8. #8
    Join Date
    Jul 2003
    Location
    Orange County N.Y.
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    Quote Originally Posted by chillerguru View Post
    Anyone expierenced alarm A140 phase reversal and existing chiller that has been running. schematic doesnt show phase protection. any recommendation other than swapping leads.and how does logic confirm phase reversal. any help will be great.
    The phase reversal alarm just means that the computer did not see a pressure differential on the 2 transducers when it attempted to start what ever compressor that alarm is associated with. Contactor isn't pulling in, the circuit breaker is tripped, or you have locked rotor.

    ...Ron

    Sorry for the redundancy.
    Last edited by rscamaro; 06-16-2013 at 01:32 AM. Reason: redundant post
    Roof Rat

  9. #9
    Join Date
    Dec 2005
    Location
    North America
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    Do you have a digital scroll compressor

  10. #10
    Join Date
    Apr 2007
    Location
    uk
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    Controller needs to see a pressure differential of 1 bar/min upon start up

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