On 30/06/2018 23:27, 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?

There are two sorts of system. The small split units (ready filled and
with self-seal connections) suitable for domestic and portacabin type
just need to be connected up. Systems that don't come charged need the
approach that you describe, same as car aircon.

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