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New Evaporator Coils necessary for new Condenser ?

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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 Stormin Mormon on May 6, 2008, 8:00 pm
Sounds like you have some really interesting HVAC techs, there. Mix Puron
and R-22? Not a good idea. If it works at all, it won't work for long.

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


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 KJPRO on May 7, 2008, 1:51 am

> Sounds like you have some really interesting HVAC techs, there. Mix Puron
> and R-22? Not a good idea. If it works at all, it won't work for long.


Are you visiting the area Stormy???
Sounds like something you'd do...



Posted by Katy-West Houston Air on August 27, 2008, 4:39 pm


Katy-West Houston Air had written this in response to
http://www.thestuccocompany.com/hvac/Re-New-Evaporator-Coils-necessary-for-new-Condenser-31920-.htm
:

Mixing R-22 and R410A is serious invitation for trouble. Once Mineraloil
mixes with the Polyolester oil you can just about guarantee compressor
failure after compressor failure. Using the old lineset is OK, but they
MUST be flushed with RX-11, and no chinching. We use a minimum of 1 can
per system after an inital high pressure nitrogen purge to insure all of
the old oil is stripped from the lines. We then follow up with a second
high pressure dry nitrogen purge to help remove any RX-11 liquid that may
be present in the lines and provide about a 2 hour vacuum to the system.
-------------------------------------
KJPRO wrote:

> wrote in message
>> Sounds like you have some really interesting HVAC techs, there.
>> Mix Puron
>> and R-22? Not a good idea. If it works at all, it won't work for
>> long.


> Are you visiting the area Stormy???
> Sounds like something you'd do...







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Posted by Bubba on May 6, 2008, 10:31 pm
On Tue, 06 May 2008 17:50:41 GMT, "jay-n-123@verizon.net"

>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.

J,
Drop the lazy fool that doesnt want to change your indoor coil. Total
bull. You might as well just toss your money into a firepit it you
dont install a matching indoor coil. R-410a (Puron) and R-22 dont mix.
You dont need to replace your lineset to switch from R-22 to R-410a.
(Sorry guys, its just not that big a deal) That being said, Yes it is
a good idea to replace it though. You can also blow the lineset with
nitrogen and/or flush it with Calgon RX-11 but the flush aint cheap.
In reality, if you get a new A/C system, why do you want to use the
outdoor disconnect over? or the old pad it sets on? Why do you still
want that 22yr old stat on the wall? If you are getting a new A/C get
someone that will replace your A/C SYSTEM! Get a warranty and dont
worry about it breaking again until that warranty period is up. I even
replace the low voltage wiring to the outside unit on a new install. I
dont like old shit on new shit. It saves me from going on callbacks
for free and I dont do nuthin for free.
Bubba

Posted by KJPRO on May 7, 2008, 2:04 am

> On Tue, 06 May 2008 17:50:41 GMT, "jay-n-123@verizon.net"
>
>>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.
>
> J,
> Drop the lazy fool that doesnt want to change your indoor coil. Total
> bull. You might as well just toss your money into a firepit it you
> dont install a matching indoor coil. R-410a (Puron) and R-22 dont mix.
> You dont need to replace your lineset to switch from R-22 to R-410a.
> (Sorry guys, its just not that big a deal) That being said, Yes it is
> a good idea to replace it though. You can also blow the lineset with
> nitrogen and/or flush it with Calgon RX-11 but the flush aint cheap.
> In reality, if you get a new A/C system, why do you want to use the
> outdoor disconnect over? or the old pad it sets on? Why do you still
> want that 22yr old stat on the wall? If you are getting a new A/C get
> someone that will replace your A/C SYSTEM! Get a warranty and dont
> worry about it breaking again until that warranty period is up. I even
> replace the low voltage wiring to the outside unit on a new install. I
> dont like old shit on new shit. It saves me from going on callbacks
> for free and I dont do nuthin for free.
> Bubba


Right on Bubba...
New condenser, evap, line-set, control, pad, stat, drain, etc...

It not only saves the client in the long run with fewer callbacks that are a
nuisance. But, it also provides for the best efficiency and system longevity
one can ask for.

As a client, ask yourself this question, can the current contractor stand
behind the existing line-set? It doesn't leak (I know this by doing a
pressure/vacuum test) but, is there any kinks in the existing line? Is there
a weak spot that could turn into a leak in the future? Is there a sag in the
line that could trap oil? Has there been a compressor burnout on this line
set?

Your answer is the same as it is for this one... would you let your
automachanic put old "used" oil into your new car engine?



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