DC Inverter Multi
VRF Service Manual
99
4�3 Refrigerant Pipe Size
4.3.1The refrigerant pipe size from the outdoor unit to the rst branch is decided by the capacity code of the outdoor unit.
Note:
① .
When the distance between the outdoor unit to the farthest indoor unit exceeds 90m, then the size of both the
liquid and gas refrigerant pipes between the outdoor unit to the rst branch should be enlarged by one level as listed
in the following table.
② .
When the distance between the rst branch to the farthest indoor unit exceeds 40m, then the size of the liquid
refrigerant pipe between the rst branch to the farthest indoor unit should be enlarged by one level as listed in the
following table.
4.3.2 The diameter of the piping between branch joints (the branch pipe)
R410a refrigerant system
Outdoor capacity code C Gas pipe (mm/inch) Liquid pipe(mm/inch)
C
56 Φ12.7 Φ6.35
56
C 142 Φ15.9 Φ9.52
142
C 220 Φ19.05 Φ9.52
220
C 300 Φ22.2 Φ9.52
300
C 450 Φ28.6 Φ12.7
450
C 670 Φ28.6 Φ15.9
670<C
950 Φ34.9 Φ19.05
950
C 1350 Φ41.3 Φ19.05
1350
C 1600 Φ44.5 Φ22.2
1600
C 2100 Φ54.1 Φ25.4
Note: When the actual pipe length exceeds 90m, the pipe diameter shall be increased accordingly�
4.3.3 The diameter of the piping from the branch joint (branch pipe) to the indoor unit
R410a refrigerant system
Outdoor capacity code C Gas pipe (mm/inch) Liquid pipe(mm/inch)
22,25,28 model Φ 9.52 Φ 6.35
36,40,45,50 model Φ 12.7 Φ 6.35
56,63,71,80,90,100,112,125,140 model Φ 15.9 Φ 9.52
Note: When the actual pipe length exceeds 90m, the pipe diameter shall be increased accordingly�
4�4 Selection of Y-Type Branch Pipe
R410a refrigerant system Total Capacity of the Downstream Indoor Unit (X) Model
Y-Type Branch Pipe
X
200 FQ01A/A
200
X 300 FQ01B/A
300
X 700 FQ02/A
700
X 1350 FQ03/A
1350
X FQ04/A
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