Haier HPU-42H03 User Manual - Page 30

Installation procedures 3. Piping connection of outdoor unit. Connect the connecting pipe and inlet and outlet liquid pipe according to the piping method. 4.Purging method Discharge the air out of the indoor unit and the refrigerant pipe by vacuumizing (1) Fasten all the nuts of the indoor and outdoor pipes to make these parts out of leakage. (2) Under the condition of the complete close of the indoor and outdoor valve center (both liquid and gas side),dismount the repair valve cap.Vacuumizing through the charge mouth of the repair valve. (3) After vacuumizing fasten the repair valve,and dismount the cap of the big and small stop valve,then loosen the stop valve center completely and fasten the big and small stop valve. 5.Extra charging amount of the refrigerant When piping is longer than 5 m, charge additional refrigerant specified in this list. Pipe length 5m Refrigerant charge (g) 10m 250 15m 500 20m 750 25m 1000 30m 1250 28