On Sat, 30 Jun 2018 15:27:42 -0700, Cynic wrote:

I've been online reading up a bit about air conditioning after seeing a
neighbour having it fitted. I notice some installation manuals stress
the need for the pipework to be nitrogen purged and pressure tested then
a full(ish) vacuum be drawn before introducing the refrigerant. Other
sources don't seem to mention this. Is a small proportion of nitrogen in
the system a serious defect and what would it's effect be during
operation?

I can't see anything too horrible happening. Nitrogen gas is very
unreactive; in fact it's used in place of the noble gas argon in
chemistry experiments where a *relatively* inert atmosphere is required
at minimum cost.



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