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seer rating doesn't match power draw melbjer 07-29-2005
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Posted by on July 30, 2005, 6:50 pm



What is more common around here is water to air, the ground water is
constant 72 degrees. I have another house that has it installed. It
uses an artesian well. I thought the air to air designs had started to
catch up in SEER ratings from looking at the advertised numbers.
Anyway, in 1989 a 4 ton water to air unit was $1100 with a built-in
ECU hot water recovery unit. Installation was almost trivial since the
artesian well was already in, just connect the water lines, pump, and
electrical. I'll check and see if that route is still available.

On Sat, 30 Jul 2005 12:34:31 -0400, "Carolina Breeze HVAC"
>
>You also know that your contractor must make over 150 measurements to make
>sure you have the SEER you bought, right?
>SEER for all intents, is marketing in this example.
>You DO normally get a higher quality unit with the higher SEERs, but with
>most, once you leave the 14SEER realm, and go into the 14+ you have over
>engineered equipment, that while it IS of higher than 10 SEER quality, it
>also is more expensive to replace, or work on.
>If you want the best of both worlds, might I suggest GeoThermal, altho,
>expect to pay out the nose for your initial installation, and you DO have to
>make repairs to it every so often, but with the right installer, and the
>right equipment, you can achieve SEER values that are sky high compared to a
>conventional air to air unit.
>



Plumbing 468x60
Posted by Sherman on July 30, 2005, 12:33 am


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.






Posted by Sherman on July 30, 2005, 12:49 am


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.






Posted by RP on July 29, 2005, 8:44 pm




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




Posted by Sherman on July 30, 2005, 6:29 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?





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