ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals
ECN Shout Chat
ShoutChat
Recent Posts
Old Computers?
by gfretwell - 11/21/23 03:45 PM
Simplify MOSFET Test With Source Measure Meter
by gfretwell - 11/18/23 09:20 PM
Ontario Electrical Safety Report
by Admin - 11/02/23 08:56 PM
New in the Gallery:
This is a new one
This is a new one
by timmp, September 24
Few pics I found
Few pics I found
by timmp, August 15
Who's Online Now
1 members (Scott35), 23 guests, and 25 robots.
Key: Admin, Global Mod, Mod
Previous Thread
Next Thread
Print Thread
Rate Thread
#51232 04/25/05 09:48 PM
Joined: Feb 2004
Posts: 41
R
rknikko Offline OP
Member
Do anyone how many HP if there is a 12 tons HVAC? How do we calculate this?

Thanks.

Joined: Sep 2001
Posts: 806
N
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
Posts: 42
N
Member
Thanks for that site NJ.

Joined: Sep 2001
Posts: 806
N
Member
I keep that one right at the top of my bookmark list. One of the handiest sites on the 'net...

Joined: Apr 2005
Posts: 8
I
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

Joined: Mar 2005
Posts: 1,803
Member


Wood work but can't!
Joined: Mar 2005
Posts: 1,803
Member


Wood work but can't!

Link Copied to Clipboard
Featured:

Tools for Electricians
Tools for Electricians
 

* * * * * * *
2023 National Electrical Code (NEC)
2023 NEC + Exam Prep Study Guides Now Available!
 
* * * * * * *

2020 Master Electrician Exam Preparation Combos
2020 NEC Electrician
Exam Prep Combos:
Master / Journeyman

 

Member Spotlight
RonKipperDatacom
RonKipperDatacom
Kansas City, KS
Posts: 30
Joined: January 2013
Top Posters(30 Days)
Admin 1
Popular Topics(Views)
313,232 Are you busy
239,166 Re: Forum
222,914 Need opinion
Powered by UBB.threads™ PHP Forum Software 7.7.5