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New Evaporator Coils necessary for new Condenser ? jay-n-123@verizon.net 05-06-2008
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Posted by KJPRO on May 7, 2008, 12:33 pm

> wrote:
> > My mom's 22 year old 4 Ton 10-seer Carrier A/C condenser is shot. Her
> > furnace is relatively new.
> >
> > She wants to replace the old unt with a new Puron Carrier 4 ton
> > condenser.
> >
> > One HVAC company is saying that they do not install new evaporator coils
> > because it is unnecessary, and the efficiency will be around 12 or 13 if
> > the
> > old coils are used with a 15 seer unit. They say they have never had a
> > problem with leaving the old evaporator coils in.
> >
> > Another HVAC company is saying that it is important to install new coils
> > because the efficency won't be good, and also the unit will be under
> > more
> > stress with the old coils and will likely only last for 4 years.
> >
> > Which of the two is correct?
> >
> > Thanks,
> >
> > J.
>
> Am I missing something on AC operation and sizing? I know from the
> many points of what has been said, he needs to replace the coil to.
> But couldnt his old 10 seer be actualy running at 8, won`t he save
> near 50% on his electric bill with a complete 15 Seer unit, yes. So if
> that is the case couldn`t a 2-2.5 ton work and a 4 ton unit be way
> oversized making the house uncomfortable and the extra cost a waste?.
> Of course he also needs pros, not hacks to bid, and do a load
> calculation in writing.



The SEER rating has nothing to do with the units capacity. It just takes
more energy to move the same amount of heat.

Thing of SEER as MGPs, the fuel costs the same and has the same octane, but
one car uses more to travel the same distance.



Posted by on May 7, 2008, 2:27 pm

> > wrote:
> > > My mom's 22 year old 4 Ton 10-seer Carrier A/C condenser is shot. Her
> > > furnace is relatively new.
>
> > > She wants to replace the old unt with a new Puron Carrier 4 ton
> > > condenser.
>
> > > One HVAC company is saying that they do not install new evaporator coi=
ls
> > > because it is unnecessary, and the efficiency will be around 12 or 13 =
if
> > > the
> > > old coils are used with a 15 seer unit. They say they have never had a=

> > > problem with leaving the old evaporator coils in.
>
> > > Another HVAC company is saying that it is important to install new coi=
ls
> > > because the efficency won't be good, and also the unit will be under
> > > more
> > > stress with the old coils and will likely only last for 4 years.
>
> > > Which of the two is correct?
>
> > > Thanks,
>
> > > J.
>
> > Am I missing something on AC operation and sizing? I know from the
> > many points of what has been said, he needs to replace the coil to.
> > But couldnt his old 10 seer be actualy running at 8, won`t he save
> > near 50% on his electric bill with a complete 15 Seer unit, yes. So if
> > that is the case couldn`t a 2-2.5 ton work and a 4 ton unit be way
> > oversized making the house uncomfortable and the extra cost a waste?.
> > Of course he also needs pros, not hacks to bid, and do a load
> > calculation in writing.
>
> The SEER rating has nothing to do with the units capacity. It just takes
> more energy to move the same amount of heat.
>
> Thing of SEER as MGPs, the fuel costs the same and has the same octane, bu=
t
> one car uses more to travel the same distance.- Hide quoted text -
>
> - Show quoted text -


I'm left wondering. In this age of escalating energy prices, who in
their right mind would ever want to use a 22 year old evaporator that
they acknowledge,will turn a new 15 seer system into a 12 seer one?

And if you do, and two years later the compressor fails, who will
warranty it?

As someone previoulsy said, it's like replacing all of a car then
shoving a radiator from a 22 year old junker into it.

Posted by Telstra on May 7, 2008, 8:10 pm
Not a lot of peaple post HERE so they have to make the most
of the one's that do.

Anybody want a 9 Lobe 7 Flute 300 Ton Frick Screw for $10
Come's with 5 Tons of NH3 and a free EVAPORATOR COIL
( NEW ONE ) Very usefull for holding down the roof in a
cyclone ( 3 Ton Weight )

The Interpretation of all the Complex technical terms USED IS
THEY WANT YOU TO BUY A NEW ONE


> My mom's 22 year old 4 Ton 10-seer Carrier A/C condenser is shot. Her
> furnace is relatively new.
>
> She wants to replace the old unt with a new Puron Carrier 4 ton condenser.
>
> One HVAC company is saying that they do not install new evaporator coils
> because it is unnecessary, and the efficiency will be around 12 or 13 if
> the old coils are used with a 15 seer unit. They say they have never had
> a problem with leaving the old evaporator coils in.
>
> Another HVAC company is saying that it is important to install new coils
> because the efficency won't be good, and also the unit will be under more
> stress with the old coils and will likely only last for 4 years.
>
> Which of the two is correct?
>
> Thanks,
>
> J.


Posted by Tony Hwang on May 7, 2008, 8:22 pm
Telstra wrote:

> Not a lot of peaple post HERE so they have to make the most
> of the one's that do.
>
> Anybody want a 9 Lobe 7 Flute 300 Ton Frick Screw for $10
> Come's with 5 Tons of NH3 and a free EVAPORATOR COIL
> ( NEW ONE ) Very usefull for holding down the roof in a
> cyclone ( 3 Ton Weight )
>
> The Interpretation of all the Complex technical terms USED IS
> THEY WANT YOU TO BUY A NEW ONE
>
>
>
>> My mom's 22 year old 4 Ton 10-seer Carrier A/C condenser is shot. Her
>> furnace is relatively new.
>>
>> She wants to replace the old unt with a new Puron Carrier 4 ton
>> condenser.
>>
>> One HVAC company is saying that they do not install new evaporator
>> coils because it is unnecessary, and the efficiency will be around 12
>> or 13 if the old coils are used with a 15 seer unit. They say they
>> have never had a problem with leaving the old evaporator coils in.
>>
>> Another HVAC company is saying that it is important to install new
>> coils because the efficency won't be good, and also the unit will be
>> under more stress with the old coils and will likely only last for 4
>> years.
>>
>> Which of the two is correct?
>>
>> Thanks,
>>
>> J.
>
>
Hi,
Rule of thumb, you always use matched set. Older coil may die
soon(spring a leak) or if you want to reuse it, it needs flushing with
special chemical which is very expensive. (R22 and Puron oil is
different) Most techs does not want to do this. Also Puron runs at
higher pressure. Proper thing to do is to replace line set, coil and use
transfer valve. For more expert advice go to forum at
www.hvacmechanic.com I am not a tech. Just alert consumer.

Posted by KJPRO on May 7, 2008, 9:48 pm

> Telstra wrote:
>
>> Not a lot of peaple post HERE so they have to make the most
>> of the one's that do.
>>
>> Anybody want a 9 Lobe 7 Flute 300 Ton Frick Screw for $10
>> Come's with 5 Tons of NH3 and a free EVAPORATOR COIL
>> ( NEW ONE ) Very usefull for holding down the roof in a
>> cyclone ( 3 Ton Weight )
>>
>> The Interpretation of all the Complex technical terms USED IS
>> THEY WANT YOU TO BUY A NEW ONE
>>
>>
>>
>>> My mom's 22 year old 4 Ton 10-seer Carrier A/C condenser is shot. Her
>>> furnace is relatively new.
>>>
>>> She wants to replace the old unt with a new Puron Carrier 4 ton
>>> condenser.
>>>
>>> One HVAC company is saying that they do not install new evaporator coils
>>> because it is unnecessary, and the efficiency will be around 12 or 13 if
>>> the old coils are used with a 15 seer unit. They say they have never
>>> had a problem with leaving the old evaporator coils in.
>>>
>>> Another HVAC company is saying that it is important to install new coils
>>> because the efficency won't be good, and also the unit will be under
>>> more stress with the old coils and will likely only last for 4 years.
>>>
>>> Which of the two is correct?
>>>
>>> Thanks,
>>>
>>> J.
>>
>>
> Hi,
> Rule of thumb, you always use matched set. Older coil may die soon(spring
> a leak) or if you want to reuse it, it needs flushing with
> special chemical which is very expensive. (R22 and Puron oil is different)
> Most techs does not want to do this. Also Puron runs at
> higher pressure. Proper thing to do is to replace line set, coil and use
> transfer valve. For more expert advice go to forum at www.hvacmechanic.com
> I am not a tech. Just alert consumer.


Using an older coil is for the Hacks, like Stormy.
You don't use a old R22 coil for a new R410 system, PERIOD!!!!!



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