LG ARUB115BT2 Installation Manual - Page 39

ENGLISH Refrigerant piping installation (3) Refrigerant Charged Method After vacuum completion, primarily charge the calculated amount of additional refrigerant through the high pressure gas pipe and the liquid pipe. If the refrigerant is not charged any more, secondarily charge the remaining refrigerant through the low pressure gas pipe and the liquid pipe. Vacuum and Primary charging Secondary charging High pressure gas pipe Liquid pipe Low pressure gas pipe High pressure gas pipe Liquid pipe Low pressure gas pipe WARNING • If the primary charging through the high pressure gas pipe and the liquid pipe is not performed after vacuum, wet air may go into the outdoor unit. If air is mixed with the refrigerant, the refrigerant cycle may malfunction and the unit may be damaged. • Charging of refrigerant while the compressor is working is prohibited. Otherwise, liquid may go into the compressor. It may cause faults of the compressor. • Use a gravimeter accurate to 0.1kg(0.2lb). • Pipe to be vacuum: liquid pipe, high pressure gas pipe (low pressure gas pipe is vacuumed via the HR unit). • If other refrigerants are mixed in the original refrigerant, a refrigerant cycle may cause malfunction or damage. • Add accurate refrigerant quantity via calculation. Too much or too little refrigerant may cause problems • Repeated on and off of the indoor units without charging refrigerant may cause faults of EEV. • Since R410A is a mixed refrigerant, the required additional refrigerant must be charged in its liquid state. If the refrigerant is charged in its gaseous state, its composition changes and the system will not work properly. Installation Manual 39