Hello,Aleksandar again.First I want to thank Brian_UK because help me a lot.Brian_UK if you have that I might
help you please ask!
Because I am so boring,please exuce me.
I have another question.
Please tell me is there anyway to charge unit with refrigerant R410a without using a weight scale(calculating subcooling and superheat with thermometer and pressure readings in order to know how much refrigerant(R410a)add into system ?
Of course if I have some refrigerant in unite in order to
add some refrigerant,because the unite is not fully empty?
Same question with R407c?

Thank you very much!

P.S.
I know that Brian_UK answer that questions and I give
my thanks in advance.

THANK YOU AGAIN BRIAN_UK.