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#51232 - 04/25/05 07:48 PM 12 tons HVAC = how many HP?
rknikko Offline
Member

Registered: 02/02/04
Posts: 41
Loc: NY
Do anyone how many HP if there is a 12 tons HVAC? How do we calculate this?

Thanks.

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#51233 - 04/26/05 03:21 PM Re: 12 tons HVAC = how many HP?
NJwirenut Offline
Member

Registered: 09/15/01
Posts: 816
Loc: Bergen County, NJ
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).]

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#51234 - 04/29/05 05:54 PM Re: 12 tons HVAC = how many HP?
northstar Offline
Member

Registered: 03/10/05
Posts: 40
Loc: Long Island, New York
Thanks for that site NJ.

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#51235 - 04/29/05 06:18 PM Re: 12 tons HVAC = how many HP?
NJwirenut Offline
Member

Registered: 09/15/01
Posts: 816
Loc: Bergen County, NJ
I keep that one right at the top of my bookmark list. One of the handiest sites on the 'net...

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#51236 - 05/02/05 09:13 PM Re: 12 tons HVAC = how many HP?
ironman Offline
New Member

Registered: 04/14/05
Posts: 7
Loc: Va
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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#51237 - 05/03/05 03:26 AM Re: 12 tons HVAC = how many HP?
Alan Belson Offline
Member

Registered: 03/23/05
Posts: 1801
Loc: Mayenne N. France
_________________________
Wood work but can't!

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#51238 - 05/03/05 03:38 AM Re: 12 tons HVAC = how many HP?
Alan Belson Offline
Member

Registered: 03/23/05
Posts: 1801
Loc: Mayenne N. France
_________________________
Wood work but can't!

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