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Thread: Display Cooler

  1. #14
    Join Date
    May 2009
    Location
    The Pas, Manitoba Canada
    Posts
    212
    When I was a rookie you were dealing with refrigerant blends that had to be mixed for the application. R12 days. It does give you a differant opinion of the modern inventions they are pushing at us.

  2. #15
    Join Date
    Nov 2006
    Location
    Southeastern Pa
    Posts
    18,574
    Quote Originally Posted by icemeister View Post
    R134A is a single component refrigerant, not a blend. Therefore, it will not fractionate.

    I the refrigerant were a 400 series blend and you suspect it has indeed fractionated, then it's useless and should be recovered and discarded.
    Ice is correct. I started using 134A in my auto days, and I never had an issue with fractionation.

    No need to jump out the OL.
    [Avatar photo from a Florida training accident. Everyone walked away.]
    2 Tim 3:16-17

    RSES CMS, HVAC Electrical Specialist

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  3. #16
    Join Date
    Oct 2009
    Location
    new jersey
    Posts
    246
    If you didnot check start components it could be a bad relay or cap.

  4. #17
    Join Date
    Sep 2002
    Posts
    2,735
    Hit it with a big lump hammer while trying to start.

  5. #18
    Join Date
    Nov 2006
    Location
    Southeastern Pa
    Posts
    18,574
    Quote Originally Posted by uniservice View Post
    If the OL is tripped on a fractional HP compressor, part of the ohming process is going to show open windings until the OL resets.

    A good note for the rookies.
    [Avatar photo from a Florida training accident. Everyone walked away.]
    2 Tim 3:16-17

    RSES CMS, HVAC Electrical Specialist

    AOP Forum Rules:







  6. #19
    Join Date
    Aug 2011
    Location
    Maine
    Posts
    106
    Would a bad start capacitor trip the breaker? After thinking about it for a second, of course it would. Sort of embarrassing how much I missed on that call...

  7. #20
    Join Date
    Jul 2000
    Location
    Guayaquil EC
    Posts
    10,370
    Quote Originally Posted by Kaedos View Post
    Would a bad start capacitor trip the breaker?
    It could...if you jumped out the overload protector.

    A bad start capacitor would prevent the compressor from starting and so the compressor motor would then draw lock rotor amps. If the OL were connected, it would sense this and trip. That's what it's there for.

    Without the OL protector, it's very likely the motor would burn, very rapidly.

  8. #21
    Join Date
    Aug 2011
    Location
    Maine
    Posts
    106
    Quote Originally Posted by icemeister View Post
    It could...if you jumped out the overload protector.

    A bad start capacitor would prevent the compressor from starting and so the compressor motor would then draw lock rotor amps. If the OL were connected, it would sense this and trip. That's what it's there for.

    Without the OL protector, it's very likely the motor would burn, very rapidly.

    Doh!

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