# Thread: Amperage of an AC Unit

1. Junior Member
Join Date
Apr 2003
Posts
12

## Amperage of an AC Unit

What is the amperage draw of a 6 ton 3 phase Air Conditioning Unit? The voltage is 120/208.

Thanks

2. 1.1 HP per ton

I = hp x 746 / 1.732 x E x efficiency x power factor

Eff = output (HP) / input (primary)

PF = watts / volt-amps

3. Can you determine this without the SEER value?

4. Originally Posted by dan316
What is the amperage draw of a 6 ton 3 phase Air Conditioning Unit? The voltage is 120/208.

Thanks
What are you calling the "unit". Air handling unit? Condensing unit? Packaged rooftop unit?

5. Looking at the nameplate would be the ONLY way I determine this...

6. Looking at the nameplate would be the ONLY way I determine this...
that's what i discovered when trying to work that forumula, but i figured what the heck, let 'em give a shot.

Can you determine this without the SEER value?
i would say certainly not.

7. Originally Posted by stickboy1375
Looking at the nameplate would be the ONLY way I determine this...
Seems like when you ask the HVAC contractor for this information, they say something along the lines of, "Just run what you'd normally run for a 6 ton unit". :grin:

8. Originally Posted by mdshunk
Seems like when you ask the HVAC contractor for this information, they say something along the lines of, "Just run what you'd normally run for a 6 ton unit". :grin:

Yeah... exactly... then for some reason they pull the "I decided to go with this unit instead" :grin:

9. "I decided to go with this unit instead"
oh that's classic!

'bout 3 mo. ago, hvac guy says "i'm putting a 15kw and a 10kw heater in this house."

this house was about 2300 sq. ft.

me - "wtf? are you serious?"

so i pull the appropriate wire to where the units are going to be.

next day - "um, yeah, i think i'm going w/ a 10kw and 5 kw."

10. If it's not there, it's not wired... it's that simple... at least for me, I know there are some exceptions to this rule...

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