D.C. Inverter Multi-variable Modular
24
tape so tightly, otherwise the insulation effect will be weakened.
6)
After wrapping the pipe, adopt sealing material to completely fill the hole so as to prevent wind
and rain from entering the room.
4.3.4 Support and protection for pipeline
(1) Support should be made for hanging connection pipe. Distance between each support can not
be over 1m.
(2) Protection towards accidental damage should be made for outdoor pipeline. When the
pipeline exceeds 1m, a pinch board should be added for protection.
4.4 Air Purging and Refrigerant Charge
4.4.1 Air purging
(1)
Confirm outdoor liquid and gas valves are closed. Air puring from the nozzel located on liquid
and gas valves by vacuum pump.See Fig.33.
(2) When there are more than 2 outdoor units, air purging from the nozzel located on the oil
balance valve. Confirm outdoor oil balance valves are closed. See Fig.34.
Liquid pipe
Gas pipe
Oil checking valve
Oil balance pipe
Low pressure
check valve
"LO"Knob
"HI"Knob
Vacuuming pump
Manometer
Manometer
Connection hose
liquid valve
Gas valve
Fig.33 Fig.34
4.4.2 Additional refrigerant charging
Outdoor unit has been charged refrigerant before delivery.
Charge additional refrigerant for field-installed connecting pipe. If the pipeline is longer than 1m,
please refer to the following table for charging amount of refrigerant. (Liquid pipe prevails)
How much additional refrigerant should be charged
Total refrigerant charging amount R= Pipeline charging amount A + ∑charging amount B of every
module
(1) Pipeline charging amount
Pipeline charging amount A= ∑Liquid pipe length×refrigerant charging amount of every 1m liquid
pipe
Diameter of liquid
pipe (mm)
Φ28.6
Φ25.4
Φ22.2
Φ19.05
Φ15.9
Φ12.7
Φ9.52
Φ6.35
kg/m
0.680
0.520
0.350
0.250
0.170
0.110
0.054
0.022
(2)
∑Refrigerant charging amount B of every module
