AC WATTAGE

[Toros]

Hi,
how many input-watt is a 3-ton A.C unit ????????
Thank you

 

[topgone]

Hi,
how many input-watt is a 3-ton A.C unit ????????
Thank you

It depends on the efficiency of the unit. Assuming a machine EER of 12, the ballpark is around (3 tons X 12,000 BTU)/12 = 3 kW! 4.5kW @ 8 EER.

 

[electrofelon]

For what purpose do you seek this information? If for load calcs and circuit sizing, you need to get the mca and mocp from the unit.

 

[Toros]

For what purpose do you seek this information? If for load calcs and circuit sizing, you need to get the mca and mocp from the unit.

FOR SERVICE LOAD CALCULATION
HOW MUCH WATT IS FOR A.C SYSTEM

 

[GoldDigger]

FOR SERVICE LOAD CALCULATION
HOW MUCH WATT IS FOR A.C SYSTEM

You have been told that the relationship between tons of A/C capacity and watts (or VA) of electrical input varies greatly with the efficiency of the A/C unit. And you have been given examples for two different assumed efficiencies (12 EER and 8 EER.)

And you have been told that looking at the nameplate will give you the exact information you need.
If the actual A/C unit has not been chosen, but you know the cooling capacity needed (in BTU or tons), then you can get a conservative answer by using the worst efficiency example from post #2.

Just repeating the question in ALL CAPS does not bring you any closer to the answer. :happysad:

 

[electrofelon]

Doing a quick calc from two units that I think i remember the specs from, both come out to around 1900 watts per ton ( That is mca, so the actual draw will be less, but mca is what you need). If you can't wait for the actual data, I would lookup several units (Google is your friend) and take the highest.

 

[kwired]

MCA is needed for branch circuit conductor selection. Actual load is needed for service and feeder calculations.

As mentioned pick worst efficiency unit possible and use it's data if you don't know what will be installed but do know the BTU capacity the HVAC load calculation came up with.