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Connection of Indoor and Outdoor Unit
Model Capacity of Indoor
Unit
High-pressure
Gas Pipe
(mm)
Low-pressure
Gas Pipe
(mm)
Liquid
Pipe
(mm)
CHS22
22、25、28
Φ9.52 Φ9.52 Φ6
CHS36
32、36、40、45、
50
Φ9.52 Φ12.7 Φ6
CHS71
56、63、71、80
Φ12.7 Φ15.9 Φ9.52
CHS90
90、100、112、125
Φ12.7 Φ15.9 Φ9.52
Note:
A. If the distance between indoor unit and nearest branch pipe is more than 10meter, then the cooper pipe
should be one grade bigger.
B Only branch pipes FQ04Na/A, FQ03Na/A, FQ02Na/A and FQ01Na/A can be directly connected to indoor
unit, and other branch pipes can not be directly connected to indoor unit. Branch pipe FQ03Na/A can not be
used for connection of two or more indoor units with capacity more than 56 (including 56).
C.
For indoor unit with rated capacity less than 5.0kW, if the length from branch piping to indoor unit is longer
than or equal to 10m, a bigger pipe shall be used as liquid pipe from the branch piping to indoor unit.
6）. The diameter of the piping between mode exchanger and indoor unit
The refrigerant piping between mode exchanger and indoor unit shall have the same diameter as the
refrigerant piping of indoor unit. The diameters of refrigerant piping for the indoor units of different capacities
are as below:
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