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Posted by Carolina Breeze HVAC on July 30, 2005, 7:24 am
> wrote:
>
>>
>>
>>Sherman wrote:
>>
>>> wrote:
>>>
>>>
>>>>On Fri, 29 Jul 2005 19:31:43 GMT, melbjer@hotmail.com wrote:
>>>>
>>>>
>>>>>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.
>>>>>
>>>>
>>>>
>>>>You are wrong to assume that amps are indirectly proportional to
>>>>SEER.
>>>
>>>
>>> What I mean.....
>>>
>>> I notice that increasing the size of the evaporator will increase
>>> the SEER. The figures from several evaluations show that a 3 ton
>>> compressor connected to 5 ton evaporator is a couple of points higher
>>> in SEER that when matched.
>>>
>>> Using controls that let the inside fan continue blowing after the
>>> compressor shuts down also increases the SEER.
>>>
>>> In other words, it's not all about the amps.
>>
>>Right, it's about true power, of which amps are required to compute.
>>IOW, it is indeed about amps, but in ways that you apparently don't
>>understand.
>>
>>hvacrmedic
>
> How does a bigger coil reduce the amps?
>
>
>
Reduces load for starters.
Amps mean nothing of great importance here..you can have a 16SEER unit
pulling 50 amps and its still 16SEER.
Bottom line, for every watt used, how many BTUs are being removed?
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