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Old 09-24-2013, 01:40 PM   #1
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AC line set through crawl, any helpful hints?

Hi all,
I'll be installing an ac line set through a pretty bad crawlspace. No other options because my condenser is in the center of the home, 1st floor. The crawlspace is minimum code clearance, so it's difficult to maneuver. The distance from end to end will be about 35', shorter if I don't have to make too many wide turns.

I'm concerned about having any dips in the lines going under a beam or some other obstruction like DWV plumbing. What are the acceptable vertical drops and rises in elevation of the piping run? Or, should I be concerned at all about this? I realize I can't make sharp turns without risking a kink in the copper.

Any helpful hints?


Last edited by RM575; 09-24-2013 at 02:21 PM.
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Old 09-24-2013, 02:00 PM   #2
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You can dip up and down all U want. As long as U are under 50 feet of line nothing else needs 2 B done. Use copper or nylon covered perforated strapping NOT steel or galvanized to hang it. Steel/galvanized will react with the copper liquid line.


"Cut it twice and it is still too short".
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Old 09-24-2013, 02:24 PM   #3
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Thanks. I thought I might be fretting over nothing. Got it on the non-galvanic hangers.
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Old 09-24-2013, 05:17 PM   #4
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no worries if its r-410 for sure... lots of velocity there.... As Yuri says dip all you want as long as the line size is correct......
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