Quote:
Originally Posted by r290r600
Because the unit is new I will use the R22 charge in it - I am re using the lines that I had the old R410a system on . just wanted to ensure the lines were clean before I put the new
R22 system together.. My question regarding the type of comp oil was because I have previously used "Shellite" as a flush fluid which is a fast evaporating mineral spirit on auto AC R12 systems. But the advice on the air duster/R152a looks like the way to go.
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You can also purge them with liquid propane as long as you are venting it to a safe area. We use a solvent called Citrol to clean resin from hoist chains. It is about 30% propane/isobutane - comes out of the spray can as liquid. The flashing of the propellant alone seems to boil off just about anything oil-based.
AC is correct, however, in that you still should have nitrogen in the lines when you braze them to avoid oxidation. Cap tubes and TEV's don't handle the flakes very well.