Correct defra legal paperwork for split a/c

over 3kg on a typical small split,
example casssette in ceiling void, 2 flares on condenser 2 flares on cassette and 10 mtr pipe with 2 brazes. 3.5kg r410a

for the annual check......
is an indirect check via temps, plus soap and sniffer check of easily accesable condenser flares and visual inspection of pipe that can be seen satisfactory?
If not is one supposed to get access to cassette, strip back lagging over flares, leaktest, remake insulation, strip insulation over braze, check for oil and sniffer test?? ....................opinions please..

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on under 3kg... For example 7kw wallmount 10 mtr pipe run,
exactly what paperwork are others raising at installation to comply with defra legislation.


On under 3kg
i assume if we are called to a system.. Example 7kw wallmount condenser disconnected by thieves and found by gate so complete loss of gas, that a gas added form same format as with over 3kg has to be filled out and a further leakcheck within 30 days?


And finally
it is highly recommended by en375 to pressure/leak test to 1.3 then 1.1map. Fujitsu when we last enquired admitted 3 way valves could leak by and were designed to seat under condenser positive pressure, and therefore nitrogen pressure testing should be done with condenser flares disconnected and plugged. Unfortunately these are the joints we are trying to check! (the internal joints would have been removed and brazed.)
what are other engineers doing here. We think 1.1map 1 min, and 140psi 1 hour, then looking for .5 torr.....
What if a leak is shown and we 99% sure it is 3 way valve letting by tiny amount. (shows up on torr test) after flares redone, braze and flares checked with soap and elec leaktester......