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  1. #1
    Join Date
    Feb 2008
    Location
    Winnipeg, Manitoba, Canada
    Posts
    14

    Question Compressor contacts

    Today I was checking contactors on a rack. They were controlling Carlyle compressors which only gave me an LRA of 120. Is a rule of thumb divide by 7 and that should be your RLA? With this information the contactors were 40amp I even found a 60 amp contactor. What size contactors should be installed?

  2. #2
    Join Date
    Dec 2009
    Posts
    147
    Call Carlyle with the M# never use rule of thumb

  3. #3
    Join Date
    Nov 2006
    Location
    Southeastern Pa
    Posts
    18,784
    The current rating of a contactor CAN be greater than needed, but not LESS than needed.

    I agree that I would not be using a rule of thumb.
    [Avatar photo from a Florida training accident. Everyone walked away.]
    2 Tim 3:16-17

    RSES CMS, HVAC Electrical Specialist

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