I'm hoping someone can put me right on this.
Basically, i have a friend who works for a HVAC maintenance company his job entails cleaning filters on splits, vrv, and package units,
It is my understanding to do this you require at LEAST C&G 2079 CATIII or equivelant,
I'm sure that i read all persons carrying out the installation,service, maintenance or repair to systems covered by F-gas regs must hold the above qualification.

i say changing belts cleaning filters is maintenance work therefore you need to hold the above.

He says he doesnt break into the fridge circuit so he doesnt need it.