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Posted by Noon-Air on May 27, 2007, 7:18 am
>>
>> >Hi everyone,
>> >I got my central ac installed recently. i have nearly 2K sqf 2 story
>> >house and contractor said that trane 2 1/2 ton should be enough to
>> >cool it at summer time. They also said that they guarantee 20F
>> >difference after ac is on. Well, i run it now and can't get even 5F
>> >difference in the house.. i'm just wondering what is the normal
>> >expectation from 2.5 ton unit should be? can it perform to cool down
>> >temperature till 70F when outside temperature is 80-85F?
>> >there is no icing on the pipes coming out from compressor i don't know
>> >there should be any ice at all...
>> >i'm kinda disappointed with it especially remembering that i paid $4k
>> >to install it....
>> >Thanks
>> >D
>>
>> "the contractor SAID that trane 2 1/2 ton should be enough to cool it
>> at summer time"
>> Lemme see. Manual J comes to mind.
>>
>> "they also SAID they guarantee 20F difference after ac is on"
>> I do hope you understand that "SAID" and "guarantee in writing" are
>> two COMPLETLY different things.
>>
>> Start with calling them back and having them see if they can get you
>> satisfied.
>> If that doesnt seem to work, call another independent contractor and
>> have an analysis done (yes, you'll have to pay for that).
>> Now you have your info on what can be expected.
>> Bubba
>
> Thanks for the advice,
> i guess i coud figure out "calling back" part myself.
> I do have in contract :
> desing temperature 70
> on a 90 day for cooling..
> is that what you're talking about or it's not enough?
> D
Whoever did the design is an idiot. Assuming that your design temp is 90
degrees, and not knowing what you design RH is, a correctly sized system
should be able to *MAINTAIN* 75F at 50% RH. Its not designed to bring the
house down to that at the design temp, but to maintain that temp at the
design temp. That means turn the system on at the thermostat, set it for
75F, and leave it to do its job. Do not turn it off when you leave the
house, do not jack the controls around, do not expect the house to go from
90F down to 75F in 20 minutes...thats just not gonna happen, turning the
thermostat down further is not going to make the system work any harder,
just set the thermostat and let it be.
FWIW, $4,000 had to be the lowest bidder and they put in the cheapest
equipment the installer could find. Care to post make/model/serial numbers
to prove me wrong??
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