1. Junior Member
Join Date
May 2008
Location
California
Posts
7

## 5 ton AC

What are the electrical specs on a 5 ton AC?
Is there a table in the N.E.C that might help me convert to Amps, and explain d:confused, disconnect sizing, breaker sizing, conductor sizing, fuse sizing etc? :confused:

2. Originally Posted by juz73
What are the electrical specs on a 5 ton AC?
Is there a table in the N.E.C that might help me convert to Amps,
No, but there are some members here that have ways of getting close enough for estimates.

As far as disconnect sizing, breaker sizing, conductor sizing, fuse sizing etc you will have to see the units specifications or label, no way around that.

3. Lable on the unit usually gives you what you need

4. Member
Join Date
Jun 2007
Posts
50

## 5 ton AC

Some people say ,convert to BTUH ,then to KW then divide by COP which may be 2 to 3 (to be obtained from manufacturer). The result will give you rough estimation of Elect power consumed. But I am not sure. See if someone can confirm this guideline.

gk

5. 8900 va roughly

6. Rule of thumb for single phase is 10 amps per ton. For an example of a 4 ton calculation, click here.

As the others have said, the name plate tells you what you need to know. Install your wire sized for the minimum amps and your OCP for the maximum amps.

7. 1 Ton (air cond.) = 12,000 Btu/hr and 1 kW = 3,412 Btu/hr
so you can get: 1 Ton (air cond.) = 12,000 Btu/hr / (1 kW / 3,412 Btu/hr) = 3.52 kW

If you have the EER (Btu/hr-watt): kW/ton = 12 / EER

8. TH's way:

1.25 HP per ton for 1/2-5 ton capacity
1.1 HP per ton for 5-50 ton capacity
1.0 HP per ton for capacity above 50 tons

9. Senior Member
Join Date
Jul 2004
Location
Ca and Wa
Posts
1,507

## HP-capacity

Originally Posted by brantmacga
TH's way:

1.25 HP per ton for 1/2-5 ton capacity
1.1 HP per ton for 5-50 ton capacity
1.0 HP per ton for capacity above 50 tons
Does this apply to different types of compressors and their efficiencies...such as scrolled vs. piston? Just curious. rbj

10. Originally Posted by gndrod
Does this apply to different types of compressors and their efficiencies...such as scrolled vs. piston? Just curious. rbj
it doesn't say. that's all the info given. I haven't used that table before; i've always been able to get the nameplate specs ahead of time. I'm sure you can e-mail tom and ask him.

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