Hi guys,
Randen, I made the same fittings you made except for the end return. I suspect that you took a wall stub for roughing in sink and cut the end off for the spun end. It looks nice but I am a bit concerned about its pressure rating for refrigerant. I guess we will see. Also i would make sure the anode is really good or you will loose your refrigerant within a short time. Another option would be to coat the copper in an epoxy paint. Effectiveness may be SLIGHTLY lessened but it may prolong the life quite a bit.
I was making the HX for small solar systems and the problem I had was spinning the big coil into the tank so I made a union type fitting instead which was easy to make a water seal on.
About machining, landlord is selling the building so I got the boot. 600V, 3700lb lathe and mill has to go and I am looking for really nice smaller ones that can run on 240V and fit in the (5000ft down to 600ft) new, perhaps temp, space.
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