Underground Refrigerant Line - Bad Idea?? - HVAC - DIY Chatroom Home Improvement Forum

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Old 11-30-2006, 01:03 PM   #1
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Underground refrigerant line - bad idea??

Rusty or others,
One of the heat pump installation manuals I'm studying says that refrigerant lines can be underground as long as they're placed within a water tight sealed conduit. I'm thinking about this method to go from condenser and then under my foundation (approx. 2-3' depth below condenser pad) and then up the other side into my crawl space. From there it's basicallly a straight run thru the crawl space to the corner of the garage where the air handler/coil is located.

Yea, it's a little more work but it sure looks better and I hate to penetrate outer building walls if I don't absolutely have to.

My concern is the "U" shape line right under the foundation. I thought that refrigerent lines should not have traps where oil can collect. Is this true or not? Should I try and avoid this method or is it really OK?

"Plan B" would route the lines straight thru a nearby foundation vent.

Thanks for the advice.


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Old 11-30-2006, 01:14 PM   #2
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Hi hennyh

Running the refrigerant lines under the heat pump or condensing unit will not hurt it in the least. As long as you don't have a huge trap you will never have any problem. If your fan coil unit is above the height of the heat pump you will want to bring the refrigerant lines above the height of the fan coil before connecting to the evaporator. This is what is called an inverted trap and will keep from flooding the heat pump with refrigerant or slugging it with oil. If you do this you shouldnt have any problem. Let me know if you need any more help.

Forgot to put this in there. Before you poor the pad I would reccomend sleeving with a piece of 2 1/2" to 3" pvc. Incase there is ever a need to remove the refrigerant lines for any reason.

Good luck


Last edited by #CARRIERMAN; 11-30-2006 at 01:37 PM. Reason: Added information
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