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  1. #14
    Join Date
    Jul 2007
    Location
    Mount Airy, MD
    Posts
    7,278
    Thread relocated to "Tech to Tech"

  2. #15
    Join Date
    Nov 2005
    Location
    Belgium
    Posts
    6
    Quote Originally Posted by Firerestoration View Post
    Liquid return during the running cycle. More commonly known as refrigerant flood back. The expansion valve plays a part in all the conditions here whether directly or indirectly this is obviously because the refrigerant can only really come this route.
    What about the very special oil separating system of a VRV? Is it not too complex compared to common oil separators? What's the advantage of this system?

  3. #16
    Join Date
    Mar 2009
    Location
    South Africa Cape Town
    Posts
    5
    In short, my findings.

    The original VRV 2 did not have a suction accumulator installed, this caused liquid to wash oil away and eventual seizure of compressor. The compressor would then draw locked rotor amps and blow the inverter board. All models after the RXY**MY1 had suction accumulator installed as far as I know.

  4. #17
    Join Date
    May 2010
    Posts
    23
    I would call that Daikin a rubbish unit.

    Similar situation on a recent job, four Fujitsu units with tandem compressors, 6 comoressors died. Originally No overload installed in power circuit of compressor, bi-flow drier filter is located in a tight corner with sensor cables around, leaving a hard time to the service people who have to struggle on how to torch it off without burning his eyebrow and cables.

  5. #18
    We have a similiar problem. Our site has 19 Daikin VRV condensers and 99 ceiling mounted cassette type evaporators. Within the last 3 years, over 15 compressors have failed as well as the circuit boards. the installation contractor had indicated that the failures are due to voltage problems. However the failures are limited to only five systems. The other systems are not affected. We did our own investigation into the voltage problems, however our data loggers did not reveal any problems. Can anyone assist?

  6. #19
    Join Date
    Mar 2009
    Location
    South Africa Cape Town
    Posts
    5
    Hi Richard

    Did you have these compressor failures on the VRVII Model RXY**MY1

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