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  1. #1
    Join Date
    Jun 2019
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    kiln, Mississippi
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    Question how to tell ton ratings

    Hello, I am very new to this field and I have seen people I have worked with tell tonnage off of the data plate and I am having a difficult time understanding how they do this. if anyone could help me understand how to tell tonnage of a unit I would love to learn. thank you

  2. #2
    Join Date
    Jan 2004
    Location
    PA
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    77,648
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    In the model number, you will generally see something like, 018, 024, 030, etc. 018 is 18,000 BTUs.1.5 ton, 024 is 24,000 BTUs/2 ton, etc.
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  3. #3
    Join Date
    Mar 2010
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    Sunny SoCal
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    Short answer, devide by 12.

    Long answer.......
    Before mechanical refrigeration ice was used to cool.
    It was understood that the latent heat of fusion of water (hidden heat needed to change water @ 32°f into ice @ 32°f) is 144 btu's/lb.
    Therefore 1 ton of ice would absorb 288,000 btu's so the standard came from this.
    It was decide to divide this by hours in a day (24) so a ton of air conditioning became 12,000 btu's.
    Eric

  4. #4
    Join Date
    Jun 2019
    Location
    kiln, Mississippi
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    Thread Starter
    Quote Originally Posted by beenthere View Post
    In the model number, you will generally see something like, 018, 024, 030, etc. 018 is 18,000 BTUs.1.5 ton, 024 is 24,000 BTUs/2 ton, etc.
    Thank you

  5. #5
    Join Date
    Jun 2019
    Location
    kiln, Mississippi
    Posts
    7
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    Thread Starter
    Quote Originally Posted by ESokoloff View Post
    Short answer, devide by 12.

    Long answer.......
    Before mechanical refrigeration ice was used to cool.
    It was understood that the latent heat of fusion of water (hidden heat needed to change water @ 32°f into ice @ 32°f) is 144 btu's/lb.
    Therefore 1 ton of ice would absorb 288,000 btu's so the standard came from this.
    It was decide to divide this by hours in a day (24) so a ton of air conditioning became 12,000 btu's.

    Thank you

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