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Old 03-20-2010, 04:44 PM   #1
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plumbing copper for HVAC refrigerant lines?


I realize one issue is lack of soldered joints on a long tubing set but other than that is there a problem with using regular plumbing copper for HVAC refrigerant lines? Are the HVAC tubing sets dried or something? Would it matter which type of copper tubing (M or L I think) was used?

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Old 03-20-2010, 05:06 PM   #2
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plumbing copper for HVAC refrigerant lines?


AC line sets are cleaned, capped and have a nitrogen smell. Water line copper is open on the ends in storage so gets all kinds of dirt and oxidation inside.

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Old 03-20-2010, 06:04 PM   #3
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plumbing copper for HVAC refrigerant lines?


We have to use thicker type "K" for HVAC as the discharge pressure is well over 200 psi.
http://www.engineeringtoolbox.com/as...bes-d_779.html
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Old 03-20-2010, 10:04 PM   #4
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plumbing copper for HVAC refrigerant lines?


What Yuri Said. Only use K Tube that is "Capped". Now, the fittings are another thing. The fittings (elbows, couplers, etc.) are the same as the plumbing fittings, just remember that refrigeration measures OD (outside diameter) and plumbing uses ID (inside diameter). So, a 3/4" refrigeration fitting is actually 5/8" in the plumbing world.

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Old 03-20-2010, 11:00 PM   #5
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plumbing copper for HVAC refrigerant lines?


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Originally Posted by Home Air Direct View Post
What Yuri Said. Only use K Tube that is "Capped". Now, the fittings are another thing. The fittings (elbows, couplers, etc.) are the same as the plumbing fittings, just remember that refrigeration measures OD (outside diameter) and plumbing uses ID (inside diameter). So, a 3/4" refrigeration fitting is actually 5/8" in the plumbing world.

Good Luck
HVAC long radius elbows
Plumbing short radius elbows
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Old 03-20-2010, 11:03 PM   #6
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plumbing copper for HVAC refrigerant lines?


Good Catch. You are correct. I left that out. The fitting grades are the same, but the LR is the standard for Ref.
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Old 03-21-2010, 04:20 AM   #7
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plumbing copper for HVAC refrigerant lines?


As others have said. Refrigeration copper lines are cleaned and dehydrated.

Type M copper is not approved for use as a refrigerant line in any area.
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Old 03-21-2010, 08:36 AM   #8
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plumbing copper for HVAC refrigerant lines?


Uhh. We have regular radius and long radius elbows. The long radius are 2-3x the price. Ouch. A standard radius elbow is longer than a standard plumbing elbow.Usually there is a S or M for Streamline or Mueller who make most of the fittings, stamped on a refrig fitting.
http://www.muellerindustries.com/

http://www.muellerindustries.com/wudfs/curacrf.pdf
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Last edited by yuri; 03-21-2010 at 09:10 AM.
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Old 03-21-2010, 02:09 PM   #9
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plumbing copper for HVAC refrigerant lines?


Thanks everyone. Guess, I'll just go with the refrigeration set.
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Old 03-21-2010, 08:52 PM   #10
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plumbing copper for HVAC refrigerant lines?


Quote:
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HVAC long radius elbows
Plumbing short radius elbows
what he said

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