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  1. #1
    Join Date
    May 2007
    Location
    Tyler, TX
    Posts
    719

    Default 3-phase for AC compressor

    Has anyone ever come across an AC compressor wired for 3 phase? This home was built in 1960 and was wired for this.

    This compressor was installed in 1998 and converted.

    An enigma?

    Here's a photo of the breaker.

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    Bruce Thompson, Lic. #9199
    www.TylerHomeInspector.com
    Home Inspections in the Tyler and East Texas area

  2. #2
    Join Date
    Mar 2007
    Location
    Ormond Beach, Florida
    Posts
    26,252

    Default Re: 3-phase for AC compressor

    Frequently on older homes (1950s, 1960s vintage) in South Florida.

    Jerry Peck, Construction / Litigation Consultant
    Construction Litigation Consultants, LLC ( www.ConstructionLitigationConsultants.com )
    www.AskCodeMan.com

  3. #3
    Join Date
    May 2007
    Location
    Tyler, TX
    Posts
    719

    Default Re: 3-phase for AC compressor

    Really? why?

    Bruce Thompson, Lic. #9199
    www.TylerHomeInspector.com
    Home Inspections in the Tyler and East Texas area

  4. #4
    Join Date
    Mar 2007
    Location
    Ormond Beach, Florida
    Posts
    26,252

    Default Re: 3-phase for AC compressor

    Quote Originally Posted by JB Thompson View Post
    Really? why?

    Because 3-phase has advantages for motor efficiencies.

    Jerry Peck, Construction / Litigation Consultant
    Construction Litigation Consultants, LLC ( www.ConstructionLitigationConsultants.com )
    www.AskCodeMan.com

  5. #5
    Join Date
    May 2007
    Location
    Tyler, TX
    Posts
    719

    Default Re: 3-phase for AC compressor

    Spoke with my electrical engineer friend this evening, he said that the motors are substantially cheaper and they run better in 3 phase (just as you said).

    Thanks

    Bruce Thompson, Lic. #9199
    www.TylerHomeInspector.com
    Home Inspections in the Tyler and East Texas area

  6. #6
    john_opwin's Avatar
    john_opwin Guest

    Default Re: 3-phase for AC compressor

    I agree with Thompson A.C requires 3 phase to run efficiently. though it could be run on 2 phase but there will be lot of fluctuation problem


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