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10. Installation
Refrigerant pipe installation
H/R
Size of the pipe between branch joints (B)
Select the pipe size according to the sum of indoor unit capacity which will be connected after the branch.
However, if the size of the pipe between branch joints (B) is bigger than the size of the pipe connected to the
outdoor unit (A), apply the pipe size (A).
Outdoor unit capacity (kW) (Cooling)
Pipe size (mm)
Liquid pipe Low pressure gas pipe High pressure gas pipe
15.0 kW and below
Ø 9.52
Ø 15.88
Ø 15.88
15.1 kW ~ 22.4 kW Ø 19.05
22.5 kW ~ 28.1 kW Ø 22.22
Ø 19.05
28.2 kW ~ 33.6 kW
Ø 12.70
Ø 28.58
33.7 kW ~ 45.0 kW
Ø 22.22
45.1 kW ~ 50.4 kW
Ø 15.8850.5 kW ~ 63.3 kW
Ø 28.5863.4 kW ~ 70.3 kW
Ø 34.92
70.4 kW ~ 98.4 kW
Ø 19.0598.5 kW ~ 135.2 kW
Ø 41.28 Ø 34.92
135.3 kW ~ 169.0 kW
Over 169.0 kW Ø 22.22 Ø 53.98 Ø 41.28
Size of the pipe between the branch joint and the indoor unit
Make a selection according to outdoor unit capacity.
Indoor unit capacity (kW)
Pipe size (O.D. mm)
Liquid pipe Gas pipe
Ø 6.35 Ø 12.70
6.1 kW ~ 16.0 kW Ø 9.52 Ø 15.88
16.1 kW ~ 23.0 kW Ø 9.52 Ø 19.05
Ø 9.52 Ø 22.22
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