Not if it uses R290 gas. The law is in place to prevent leaks of F-Gases into the atmosphere, so if you don't actually mess up really bad nobody will come after you. (not legal advice) Like installing your own ceiling lamps, which would also need a certified electrician to do it.
@Neophyst1@robin7331 I never said anything about the legal status at all.
Also you are not quite correct, it all depends on the refridgerant used. Take a R290 system to be on the legal side.
@showp1984@robin7331 The units datasheet states the linelenght for which it is prefilled and does not need adjustment. Yes you can also kill yourself installing a lamp. For someone mildly technically inclined its still not that of a hard job if you understand what to do.
Sure i understand your choices too, i just wanted to clarify that you dont need to fill these units either and it is much less complicated than some make you want to believe. You are right, a proper inspection might be required, the same as when you change a ceiling lamp on your own. We all call an electrician for that.
No, you dont need that. You just need a vacuumpump. All "proper splits" have a prefilled outdoor unit. The process is quite simple actually, after 1h of watching youtube videos and buying a vacuumpump you are able to do it. (I installed 2 multisplits with 6 indoor units last year)
i understand that, there are two options a.) do something b.) imagine having lost that screw around the block without ever noticing it....
for the a scenario you can just buy a cheap tire repair set with those long rubber plugs, drill and insert that. i have done this like 10+ times in my life, and often did 250km/h plus on the german autobahn with tires plugged like that, so i deem it safe. tire manufacturers hate that trick ;-)
Hard to tell from a video anyways, in outdoor conditions it might hit different. Have a friend do a testdrive behind you in day/night conditions maybe to adjust brightness. You probably wont have a brakepressure signal anywhere, but with a small transducer you could make it adaptive to level of braking and only flash above a threshold. A potentiometer on the pedal would do too. (rate of change)