hi
after vacuuming system
if i want to charge it
what is the best way
as example
if i have 2 ton window type ac and r22
some people say
i must charge it with liquid in the beginning then after turning it i must charge it with vapor only
other say i must charge it with vapor when unit is off
then after turning on it i can charge with liquid and vapour
so what is the properly way to charge ac
others say