31
Connection of Indoor and Outdoor Unit
3）. Selection of the branch pipe of indoor unit
Branch pipes between indoor units shall be selected based on the total capacity of downstream indoor units
in accordance with the following table.
R410A refrigerant
system
Total Capacity of the
Downstream Indoor Unit (X)
Model
X≤56
FQ01Na/A
56＜X≤220
FQ02Na/A
220＜X≤300
FQ03Na/A
300＜X≤680
FQ04Na/A
680＜X≤960
FQ05Na/A
960＜X≤1350
FQ06Na/A
Y-Type Branch Pipe
1350＜X
FQ07Na/A
Note:
A. When the total capacity of downstream indoor units is higher than the capacity of outdoor unit, the branch
pipe shall be selected according to the capacity of outdoor unit.
B.
For branch pipes with capacity more than FQ05Na/A（including FQ05Na/A）, the ratio of the capacity
values corresponding to the two branches after the jointing shall not exceed 3：1.
Example: To branch the pipe for which the total capacity code of downstream indoor unit is 960, the sum of
the capacity code of downstream indoor units on any side after branching shall not be less than 240.
C
．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).
D.
If no suitable pipe is available for branch piping, a transition pipe shall be added, or coupling of piping with
the exterior of branch pipe shall be used for connection.
4）.The diameter of the piping between branch joints (the branch pipe) and the side branch pipes of the
indoor unit.
High-pressure gas pipe Low-pressure gas pipe Lquid pipe
Total capacity code
of indoor units at
downstream side mm inch mm inch mm inch
C≤56 Φ12.7
1/2
Φ12.7
1/2
Φ9.52
3/8
56<C≤142 Φ12.7
1/2
Φ15.9
5/8
Φ9.52
3/8
142<C≤220 Φ15.9
5/8
Φ19.1
3/4
Φ9.52
3/8
220<C≤300 Φ19.1
3/4
Φ22.2
7/8
Φ9.52
3/8
300<X≤500 Φ25.4
1
Φ28.6
9/8
Φ12.7
1/2
500<X≤680 Φ28.6
9/8
Φ28.6
9/8
Φ15.9
5/8
680<X≤960 Φ28.6
9/8
Φ34.9
11/8
Φ19.1
3/4
960<X≤1350 Φ34.9
11/8
Φ41.3
13/8
Φ19.1
3/4
1350<X≤1580 Φ41.3
13/8
Φ44.5
7/4
Φ22.2
7/8
1580<X
Φ41.3
13/8
Φ44.5
7/4
Φ25.4
1
5）.The diameter of the piping from the branch joint (branch pipe) to ME unit
The diameter of copper pipe between branch pipe and ME box’s shall be equal to ME box’s connection pipe.
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