ECN Forum Forums General Topics of the Trade General Discussion Area 12 tons HVAC = how many HP?

Do anyone how many HP if there is a 12 tons HVAC? How do we calculate this?

Thanks.

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).]

Thanks for that site NJ.

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

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

http://www.eng-tips.com/viewthread.cfm?qid=987528&page=5
This may help.
Alan

typo! should be-
http://www.eng-tips.com/viewthread.cfm?qid=98752&page=5

Alan