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Posted by JohnR66 on July 30, 2005, 2:17 am
>
> I am looking afor a new central AC. I live in Florida so efficiency is
> important. I looked at Tranes, and found that the 4 1/2 ton unit I
> looked at was rated at a 14 SEER, yet the specs stated it drew 27.5
> amps for the compressor, an amp or so for the compressor fan, and 7
> amps for the air handler blower (full speed). Now 4 1/2 tons is 54000
> BTU's per hour, and the power draw is (27.5+1+7)amps X 220V, or 7800
> watts. This would seem to me to give a SEER of 6.9. This is less than
> half of the stated SEER of 14. Can anyone explain this? I looked at
> the ARI website and this seems to be the case for every manufacturer.
> If I buy a buy a 14 SEER 54000 BTU/hour AC, I would expect it to draw
> 54000/14 watts, or 3850 watts. Can anyone explain this? Neither the
> Trane dealer or distributor could answer this. Thank you in advance.
>
>
On the current draw side:
1) volts X amps is not watts in AC. It is volt-amps (VA). Actual watts will
be less.
2) 7 amps on a 240 volt blower motor? It is probably a 120 volt motor.
3) As the other guy said, amps on the name plate is usually maximum load.
John
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