copper vs pvc compressor lines?
They silver solder the joints in ac apps.
"Silfos" is not exactly "silver solder," and the use of the term is somewhat mis--used over the years because of the fairly recent introduction of LOW temp silver BEARING solder being used in plumbing.
"Silver solder" in the case of AC/ refrigeration should probably be called "silver braze"
"Silver solder" in present form is usually low temp, IE water lines, not what we want here
"Silfos" is a brand name but is DIFFERENT than hi- temp silver braze / solder
"Silfos" or similar material is a very interesting silver bearing rod which can braze copper to copper with no flux. You just clean the copper, heat with oxy/ acet to temp, and flow the rod. It is truely marvelous stuff.
I used to work in this field and am well acquainted with it.
Only time I used actual hi temp silver solder / braze was to connect copper to steel, IE replacing compressors.
There were SOME PEOPLE that used low temp (back then lead) solder to connect AC piping, and in one case I had to go clear through several systems that had been done that way and rework all the joints because they were starting to corrode and leak. These were odd--ball Trane computer room systems which had the compressors in the ID units with only the condenser coil and fans sitting OD. This means that one line going out is not only high pressure, but it's also very hot, as it's the "hot gas" line. I would guess these are more subject to failure due to temperature changes.
