# Thread: how to tell ton ratings

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## 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. 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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Short answer, devide by 12.

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.

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Originally Posted by beenthere
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

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Originally Posted by ESokoloff
Short answer, devide by 12.

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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