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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 jay-n-123@verizon.net on May 6, 2008, 1:50 pm
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 Noon-Air on May 6, 2008, 2:17 pm

> 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.
Neither of them are correct. The coils *MUST* be replaced when switching to
R-410a(Puron). R-410a and R-22 are not compatable at all, nor are the oils,
and R-410a operates at much higher pressures than R-22....yet another reason
to change the coils. BTW, did you know that the manufacturers will *NOT*
stand behind their warranties if a correctly matched coil is not used with
the new condenser??

I would suggest that you get a properly matched system from and have it
installed by a *COMPETENT*, licensed, insured, professionally trained HVAC
technician. and don't walk, but run away from those two companies. Don't
forget to get that 10 year parts and labor extended warranty with the new
correctly matched system. Also demand a copy of the ARI Certificate of
Performance for the new system. If they can't or won't give you one, then
show them the door.

FWIW, I would not put Carrier in my home on a bet.

http://www.consumerreports.org/cro/appliances/heating-cooling-and-air/gas-furnaces/furnaces-repair-history-205/overview/


Posted by John Gilmer on May 6, 2008, 2:39 pm


>
> I would suggest that you get a properly matched system from and have it
> installed by a *COMPETENT*, licensed, insured, professionally trained HVAC
> technician. and don't walk, but run away from those two companies.

You might still be able to get an R-22 instalation done. We had a
compressor failure a few years ago and our HVAC just replaced the outside
unit for less than $2000. It's only a 5 year guarantee but the man who did
the work is very good and very careful.

If you can't just replace the "outside unit" and/or your HVAC isn't up to
just replacing the compressor you may be stuck with replacing just about
everything but the thermostat and the blower housing.


** Posted from http://www.teranews.com **

Posted by Stormin Mormon on May 6, 2008, 9:48 pm
Just wait till Bubba hears that you're not replacing the thermostat.
OOOHH... I don't want to be here.... oh, yah, maybe I do?

--
Christopher A. Young
Learn more about Jesus
www.lds.org
.





You might still be able to get an R-22 instalation done. We had a
compressor failure a few years ago and our HVAC just replaced the outside
unit for less than $2000. It's only a 5 year guarantee but the man who did
the work is very good and very careful.

If you can't just replace the "outside unit" and/or your HVAC isn't up to
just replacing the compressor you may be stuck with replacing just about
everything but the thermostat and the blower housing.


** Posted from http://www.teranews.com **



Posted by Steve B. on May 6, 2008, 11:37 pm
> 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?


Would you buy a new Honda and have them put the radiator from your
1986 Oldsmobile in it to save a few bucks? The high efficiency
systems are designed to work as a complete package. Have the coil and
the lines replaced with new.

As another poster already suggested, I would find a contractor that
will do a load calculation to confirm the size unit that is needed and
not just assume that what is there now is correct. She can save quite
a bit on the system and the cost to run it by ensuring that the system
is sized properly.

Steve B.

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