Haier HPU-48C03/NAF Operation Manual page 19

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
Refrigerant charge (g)
5m 10m
325
17
15m 20m
650 975
25m
30m
1625
1300