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#51232 04/25/05 09:48 PM
Joined: Feb 2004
Posts: 41
R
rknikko Offline OP
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Do anyone how many HP if there is a 12 tons HVAC? How do we calculate this?

Thanks.

Joined: Sep 2001
Posts: 806
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Member
According to:
http://www.onlineconversion.com

,12 ton of refrigeration = 56.5713594 horsepower [electric]

The conversion factor is 1 ton = 4.714 HP

However, if you are sizing feeders, etc., you need to go by the nameplate data on the motors, or other manufacturer's data.

[This message has been edited by NJwirenut (edited 04-26-2005).]

Joined: Mar 2005
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Thanks for that site NJ.

Joined: Sep 2001
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I keep that one right at the top of my bookmark list. One of the handiest sites on the 'net...

Joined: Apr 2005
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New Member
NJ is correct that you must use the ampacity and fuse ratings on the unit's data plate to size the feeder. However, the info from the online conversion table may be misleading in regard to your question. In practical A/C application, 1 ton = 12,000btu = 1h.p. compessor motor. Therefore, a 12 ton A/C would have a 12 h.p.(approx.)compessor or two 6 h.p.compressors.

The term "ton" comes from an early measurement of a system's capacity to reject heat. A one "ton" system would reject enough heat to melt a "ton" of ice in 24 hours.


Bob

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Wood work but can't!
Joined: Mar 2005
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Wood work but can't!

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