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What if it is 80 feet of line and two stories, and down a brick wall?
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Replace the lines.
The process to clean them out for the different lubricant is not worth the time., effort, or chance.
What if it is 80 feet of line and two stories, and down a brick wall?
If it is rather easy and practical to do so, sure, go ahead and replace it. Depending on if you are increasing/decreasing sizes, the diameters of the lineset (especially the suction line) may change. Typically, the liquid line (the smaller one) is usually 3/8", but the larger (suction) line will vary depending on the size of the unit. Sometimes I've seen where contractors who are re-using the lineset have to match up the new units size to the old suction line and there's a 1/8" difference. There's
usually no harm in this, but anything more than 1/8" can be looking for trouble to start down the road.
Also what I mean by "easy", is the lineset on the outside of the exterior wall? When it goes into the home, would it be easy to gain access to braze the joint where the lines would meet? For my own house, the lineset is actually inside the wall so I'll be re-using that thing for quite a while.