3 phase semi-herm compressor overload ?
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  1. #1
    Join Date
    Jul 2003
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    218
    I do residential air conditioning and have not done much refrigeration work with semi- hermatic compressors. Can some one help me to understand how a three phase compressor w/overload is wired ? A diagram of the windings and overload would help please?

  2. #2
    Join Date
    Apr 2002
    Location
    most of the time in the Philippines
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    1,211
    It breaks all 3 legs at once. Get a copy of the Copeland Electrical Handbook from your wholesaler. You'll find some example diagrams in there. You can also call Tecumseh for a copy of their Compressor Service Handbook [free] or download it from the website. http://www.tecumseh.com The phone # is at the website. My 2 cents worth- all techs should have a copy of each of these books.

  3. #3
    Join Date
    Jul 2003
    Posts
    218
    thank you so much

  4. #4
    The Copeland handbook is very useful, but be very careful because there are hundreds of variations on compressor wiring. For a Copeland compressor, the last three positions in the nomenclature tell you what kind of electrical set-up you have.

    Most three phase compressors in the US are -TFC for 208/60/3, -TFD for 460/60/3 and -TSK for 208 or 460. The -TFC/TFD have internal line break overloads that require no external wiring. The TSK uses an external electronic overload wired into the control circuit.

    Just make sure you are looking at the right diagram in the book and you'll be OK.

  5. #5
    Join Date
    Jul 2003
    Posts
    218
    alright, I appreciate all of the great information. Is both wiring shcematics in the copeland book on internal and external overload? And is all of the external overloads on semi-hermatic compressors electronic?

  6. #6
    Join Date
    Apr 2002
    Location
    most of the time in the Philippines
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    1,211
    The Copeland book covers wiring diagrams for their entire product line. Only larger horsepower Copeland compressors use the electronic module. A lot of the smaller compressors use an external overload that is not electronic. For example, some of the L body 3 phase models have a line break type overload in the control box.

  7. #7
    Join Date
    Dec 2007
    Location
    New York
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    23

    Copeland Handbook

    Do they still make the Copeland Electrical Handbook? The one I have is from 1995.

    Syd

  8. #8
    Join Date
    Jun 2005
    Location
    Las Vegas NV
    Posts
    1,149
    Quote Originally Posted by emerson climate tech View Post
    The Copeland handbook is very useful, but be very careful because there are hundreds of variations on compressor wiring. For a Copeland compressor, the last three positions in the nomenclature tell you what kind of electrical set-up you have.

    Most three phase compressors in the US are -TFC for 208/60/3, -TFD for 460/60/3 and -TSK for 208 or 460. The -TFC/TFD have internal line break overloads that require no external wiring. The TSK uses an external electronic overload wired into the control circuit.

    Just make sure you are looking at the right diagram in the book and you'll be OK.
    emerson climate tech,

    Check my profile and send me an email.

    powell

  9. #9
    Up date your Copeland book yearly. They are always making changes.
    FEN

  10. #10
    Join Date
    Jun 2005
    Location
    Las Vegas NV
    Posts
    1,149
    Quote Originally Posted by Flare Nut View Post
    Do they still make the Copeland Electrical Handbook? The one I have is from 1995.

    Syd
    Look on the back for the part number. It will have "6400 R28 Revised 2/07" for the latest version. At least that is the one I have, there could be a newer one. Anyway, that's how you know what version you have.

  11. #11
    Join Date
    Dec 2007
    Location
    New York
    Posts
    23
    My book says #6400-R18 Dated 1995

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