Corrosion forming on copper line


Old 01-25-15, 08:07 AM
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Corrosion forming on copper line

Hi, I noticed some corrosion on the refrigerant lines where they first enter through the basement wall, I did not see any corrosion anywhere else either inside or outside. This is a new install, only about 3 months old. I was just looking at everything not too long ago, maybe a couple weeks ago, and did not notice anything then, so this has happened very quickly. This is a heat pump, but it has not been running much lately because of low outside temps being below the balance point, plus I burn wood also when I am home to do so.
Any ideas on the cause, and then what to clean it with, and anything to prevent more corrosion? thanks

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Old 01-25-15, 11:48 AM
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That's surface corrosion caused by water. Is the outside sealed ?

It looks like water is running in from outside.
Old 01-25-15, 05:16 PM
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That sealant around the tubing appears to be silicone. NOT GOOD. Uncured silicone contains glacial acetic acid which will corrode copper. Also, those lines don't appear to be sleeved. When going thru masonary walls, the tubing must be in a plastic sleeve, usually a short piece of PVC pipe.
Call your installer back & make them fix it.

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