Liquid refrigerant charging of a system is normally accomplished in the liquid line. For example, when a system is out of refrigerant, liquid refrigerant can be charged into the king valve on the...
with an electronic leak detector or other professional leak detection equipment. Professionals should be called immediaterly as it could be a serious health and safety risk, also a threat to the...
How much it takes, or how much it has in the system at any given time? To know how much refrigerant goes into the system, there'll be a sticker from the manufacturer - usually on the section of the...