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Wrot Copper Fittings - ACR vs. H/W store - Any difference??

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Wrot Copper Fittings - ACR vs. H/W store - Any difference?? Howard 01-28-2007
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Posted by dadstansell on January 28, 2007, 9:49 pm
I regularily use standard copper fittings on refrigeration lines. But
there are enginering considerations


> Is sizing the only difference?? Would a 7/8" ACR coupling be
> identical to a 3/4" water coupling? (ie nothing different about the
> metalurgical properties of the copper that make it better for HVAC)
>
There are three grades of copper piping. These are labeled K, L, M
L is also called ' blue" M is also called " red "

Refrigeration is always L or K as M is not acceptable. Soft copper
or rolled copper is usually a L grade.

Secondly any copper used must be exceptionally clean. Refrigeration
copper has a 'dry' gas inside to keep out the moisture. Moisture will
destroy a compressor motor. And be expensive. Technicians know how
to remove the moisture.

Fitttings. Couplings and Tees are almost the same. Elbows are
not. Most water elbows are short radius and creates back pressure
friction greater than is acceptable in refrigeration. You will
need to go to a plumbing wholesaler to get long radius elbows that can
be used with refrigeration. An alternate is to only use 45 degree
elbows as they do not restrict as much.

Solder -- Soft solder can be used in some reffrigeration but probable
not what you are doing and not with the off the shelf flux. So you
will need to get a high temperature solder with a high temperature
torch.


Posted by Geoman on January 30, 2007, 9:17 pm

>I regularily use standard copper fittings on refrigeration lines. But
> there are enginering considerations
>

> Secondly any copper used must be exceptionally clean. Refrigeration
> copper has a 'dry' gas inside to keep out the moisture. Moisture will
> destroy a compressor motor. And be expensive. Technicians know how
> to remove the moisture.

One correction if I may.

Most think the nitrogen is to keep moisture out because it will hurt the
compressor. Well, if that's so, I want to see who is fast enough to pull the
end cap off and soldier it in place before moisture and air get into the
copper <g>

The nitrogen is in the tubing to prevent it from oxidizing over time before
the tubing is used. Its the installer who needs to purge the tubing before
soldiering and evacuation.

If one installs a system and comes back months later without first
evacuating and then pressurizing with nitrogen the tubing will oxidize and
cause possible problems with valves and the compressor, how much depends.

Rich



Posted by on January 30, 2007, 9:37 pm
wrote:

>
>>I regularily use standard copper fittings on refrigeration lines. But
>> there are enginering considerations
>>
>
>> Secondly any copper used must be exceptionally clean. Refrigeration
>> copper has a 'dry' gas inside to keep out the moisture.

        When did you ever see fittings packed with dehydrated gas ?
They come in cardboard boxes and are open to the air, 100 % of the
time.



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Posted by Geoman on January 31, 2007, 11:25 pm

> wrote:
>
>>
>>>I regularily use standard copper fittings on refrigeration lines. But
>>> there are enginering considerations
>>>
>>
>>> Secondly any copper used must be exceptionally clean. Refrigeration
>>> copper has a 'dry' gas inside to keep out the moisture.
>
> When did you ever see fittings packed with dehydrated gas ?
> They come in cardboard boxes and are open to the air, 100 % of the
> time.

Stay tuned for an answer in a day or two. :-)


>
>
>
> --
> Click here every day to feed an animal that needs you today !!!
> http://www.theanimalrescuesite.com/
>
> Paul ( pjm @ pobox . com ) - remove spaces to email me
> 'Some days, it's just not worth chewing through the restraints.'
> 'With sufficient thrust, pigs fly just fine.'
> HVAC/R program for Palm PDA's
> Free demo now available online http://pmilligan.net/palm/



Posted by James on January 28, 2007, 9:51 pm
No, it's outside diameter. Just go to the supply store and buy the right
stuff, it's not like it is vastly more expensive or anything.

> Is sizing the only difference?? Would a 7/8" ACR coupling be
> identical to a 3/4" water coupling? (ie nothing different about the
> metalurgical properties of the copper that make it better for HVAC)
>
> TIA
> On Sun, 28 Jan 2007 17:45:57 -0500, "Stormin Mormon"
>
>>Slightly different sizes. 7/8 ACR is same as 3/4 water copper.
>>ACR is outside diameter, and water is inside.
>



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