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    zanec's Avatar
    zanec Posts: 26, Reputation: 3
    New Member
    		  
    #1

    Apr 16, 2009, 03:29 PM
    Working pressure of R-12
    I have a pressure/temperature chart of different refrigerants but my question is, in a refrigeration unit (ice maker) charged with R-12, what is the working pressure of it and where would I find this info in the future?
    letmetellu's Avatar
    letmetellu Posts: 3,151, Reputation: 317
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    #2

    Apr 16, 2009, 07:28 PM
    At 32 pounds R 12 will be 30 F That is a good point for running an automobile.

    At 9.1 pounds it will be 0 F degrees.

    At -21 pounds that is the boiling point of Freon R 12.

    I am not sure that ths is what you want.
    KISS's Avatar
    KISS Posts: 12,510, Reputation: 839
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    #3

    Apr 16, 2009, 07:40 PM

    Pressures are not enough. You need to learn about superheat and subcooling.

    Start here:

    Charge by sub cooling? - HVAC-Talk: Heating, Air & Refrigeration Discussion
    zanec's Avatar
    zanec Posts: 26, Reputation: 3
    New Member
    		  
    #4

    Apr 17, 2009, 07:29 AM
    Quote Originally Posted by letmetellu View Post
    At 32 pounds R 12 will be 30 F That is a good point for running an automobile.

    At 9.1 pounds it will be 0 F degrees.

    At -21 pounds that is the boiling point of Freon R 12.

    I am not sure that ths is what you want.

    I think what I was looking for is the PSI low side and high side when a system is properly charged without the superheat/subcooling calculation. Like the other answer I received, I need to be refreshed on superheat and subcooling if I want to be precise on my charge.
    Thanks for the help though.
    zanec's Avatar
    zanec Posts: 26, Reputation: 3
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    #5

    Apr 17, 2009, 07:31 AM
    Quote Originally Posted by KeepItSimpleStupid View Post
    Pressures are not enough. You need to learn about superheat and subcooling.

    Start here:

    Charge by sub cooling? - HVAC-Talk: Heating, Air & Refrigeration Discussion
    I know I need to refresh myself on superheat and subcooling. Thanks for the help.
    sutrimo's Avatar
    sutrimo Posts: 1, Reputation: 1
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    #6

    Apr 15, 2011, 08:48 PM
    How many pressure work for R12
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