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  1. #1
    Join Date
    Jan 2012
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    Trane CGAM 100B 2M02 AXD2

    The two circuits have a compressor fault lock out on each circuit compressor B.

    Is this alarm triggered by the High, low pressure, or scroll protection module only?
    What is standard approach for each circuit? I've noticed them as high as 7 degrees. The unit has 4 scrolls and a dual circuit stainless steel plate heat exchange.
    The unit is about 10 months old here and I know it was put in over sized to accommodate future air handlers. Im not thinking the two issues I've mentioned are related as of yet but i want to see if there is something i could do if that approach is too high.

  2. #2
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    Thread Starter
    I just realized that the low pressure switch is not used in this machine sorry. Same question no low pressure

  3. #3
    Join Date
    Jul 2007
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    Compressor fault means the compressor protection module (located in the peckerhead of each compressor) has tripped. The module monitors the 3 phase power coming into the compressor and the winding temp sensor. If you have 2 compressors that tripped, more than likely you had a power anomaly that occurred on the line side power. To reset the compressor protection module, you have to power cycle the module before you clear the alarm in the DynaView. The easiest way to power cycle the compressor protection module is to shut down the chiller and kill the disconnect.

    7 degrees approach is normal.

  4. #4
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    Thread Starter
    It was the compressor protection module. Thanks very much. I used the harness connector to open line volts (XJ10 & XJ13 I think) to compressor scroll module.
    It did reset however I found amp draw a little to funky for me. Current draw on compressors are 73,73, and 84 mostly identical on all compressors when running. Line volts are 242,242,238.
    This unit has been operable since late last summer. I've noticed while reading alarm yesterday the compressor 1 for any circuit would always run but second one of the compressors would run like two minutes to ten minutes and shut iff. It would over shoot the control temp by several degress. I wonder if the compressors may be short cycling causing the alarm .

  5. #5
    Join Date
    Dec 2011
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    Checked water flow threw braze plate heat exchanger and check for dirty strainers. What is your water temp split?

  6. #6
    Join Date
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    Quote Originally Posted by hvactech357 View Post
    Checked water flow threw braze plate heat exchanger and check for dirty strainers. What is your water temp split?
    More importantly ....what are your design conditions for temp/flow .
    The toy chest is officially full ... I got a new toy..... 2007 Aston Martin V8 Vantage and yes it still gives me goosebumps
    You bend em" I"ll mend em" !!!!!!!
    I"m not a service tech.. I"m a thermodynamic transfer analyst & strategic system sustainability specialist
    In the new big shop , greasin', oilin' . tweakin' n shinin' !!

  7. #7
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    Thread Starter
    Quote Originally Posted by Healey Nut View Post
    More importantly ....what are your design conditions for temp/flow .
    Interestingly I called Trane months ago when I first posted and they had a DP of like 9psi across the evaporator and I had like 6.7. psi . I thought that was okay.

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