The Inspector's Journal Forums
Username:
Password:
Save Password


Join TIJ Forums
Lost Password?
Subscribe to TIJ's Newsletter

All Forums > Technical Forums > HVAC Forum >

Buried Refrigerant Lines

Previous Topic: testing flue draft - Topic - Next Topic: Dating New TopicReply to TopicShare Topic
Posted By  
Champaign, Illinois
Posts: 515
Joined: Sep, 2006
Currently offline offline
  
Thread Start First Page
[#1] Posted: 07/13/2007 - 6:19:16 PM
Reply with Quote
Is this allowed anywhere? I've seen this situation a few times around here.

Image Insert:

232.93 KB

View Profile
Gaston, Oregon
Posts: 8859
Joined: Dec, 2003
Currently offline offline
  
Buried Refrigerant Lines
[#2] Posted: 07/13/2007 - 7:51:48 PM
Reply with Quote
Quote: Originally posted by fqp25

Is this allowed anywhere? I've seen this situation a few times around here.


I think it's fine. Terry? George?

- Jim Katen, Oregon

Jim Katen, Oregon
www.amipdx.com
View Profile
State: PA & NJ
Posts: 3495
Joined: Jan, 2004
Currently offline offline
  
Buried Refrigerant Lines
[#3] Posted: 07/13/2007 - 8:59:49 PM
Reply with Quote
I've read several Carrier install instructions that state: "Do not bury lineset". I've also seen other brands with R410A that state none to a max of 3' can be buried.
Bill Kibbel, Historic & Commercial Building Inspections - Old House Resources
State: Arizona
Posts: 758
Joined: Jun, 2005
Currently offline offline
  
Buried Refrigerant Lines
[#4] Posted: 07/13/2007 - 9:19:04 PM
Reply with Quote
I see refrigerant lines buried mostly on older homes, I never thought to call it out, some are 40 years old and still apparently not leaking. Usually newer homes ac lines are in the flexible black 4 inch pipe (pvc?), the non-perforated version of foundation drain pipe. Then they shoot a can or two of "great stuff" in the ends.

Is there some limitation to the distance the electrical flex conduit can extend across the ground or in the air?

View Profile
Sagamore Hills, Ohio
Posts: 3113
Joined: Dec, 2003
Currently offline offline
  
Buried Refrigerant Lines
[#5] Posted: 07/14/2007 - 04:05:49 AM
Reply with Quote
In the real world I don't think there would be a problem. I'm not sure I'd even mention it. Only problem I see would not being able to leak check the line set should a leak occur but you can always run a new line set [I was going to say "however, you can always run a new line set" but I see that's not acceptable
Terry



http://www.hlis.net

This space for let - please inquire within.


View Profile
Rochester, New York
Posts: 4350
Joined: Dec, 2003
Currently offline offline
  
Buried Refrigerant Lines
[#6] Posted: 07/14/2007 - 04:07:09 AM
Reply with Quote
Manufacturers' spec is the deciding factor, but there's nothing particularly wrong with a buried line set.

The new direct exchange heat pumps depend on it.

Chad Fabry
StructureSmart Home Inspection Rochester, NY
www.structuresmart.com
View Profile
State: PA & NJ
Posts: 3495
Joined: Jan, 2004
Currently offline offline
  
Buried Refrigerant Lines
[#7] Posted: 07/14/2007 - 07:27:24 AM
Reply with Quote
It can be a problem, depending on certain other factors.

Many years ago, I contacted a manu. rep about an installation that had about 15' of buried lineset. (They wanted the outdoor unit behind the pool fence) He explained the issue and why many specs don't allow or at least recommend against it.

If the air handler is in an above grade floor of the home, the lineset is lower than the evaporator and condenser. In the off cycle, with the ground being cooler, the refrigerant can condense into a liquid. When the system kicks on, the liquid can then be pumped into the compressor. Liquid doesn't compress.

He mentioned troubleshooting many systems that had gone through several compressors, before they contacted him to identify the problem.

Bill Kibbel, Historic & Commercial Building Inspections - Old House Resources
   
Previous Topic: testing flue draft - Topic - Next Topic: Dating New TopicReply to TopicShare Topic
Jump To:
The Inspector's Journal Forums © 2002-2013 all topics or replies that are posted on The Inspector's Journal
are copyrighted material of the original author that posted the topic or reply.
Go To Top Of Page 
 
Pick an RSS Feed

The views expressed on this website are the views of the authors and
do not necessarily reflect the views or policies of the sponsors.
© 2002-2013 Copyright DevWave Software Inc.
Find a Home Inspector

Powered By: Snitz Forums 2000