R410A All DC Inverter V4+S Series 60Hz MCAC-VTSM-2015-09
98 Installation
3. Local fixing
To avoid stress resulting from pipe expansion and shrinkage, it is usually required to conduct local fixing
beside the wall through-holes of the branch pipe and end pipe.
4.1.4 Requirements for installing branch pipe subassembly
When laying the branch pipe subassembly, pay attention to the following:
1) Do not replace branch pipe with tee pipe.
2) Follow the construction drawing and installation instructions to confirm the branch pipe models as well as
the main pipe and branch pipe.
3) Sharp bends (an angle of 90°) and connection to other branch pipe subassembly are not allowed within
500mm of the branch pipe subassembly.
4) It is best to install the branch pipe subassembly at a place that facilitates welding (if doing so is impossible, it
is recommended to prefabricate the subassembly).
5) Install vertical or horizontal branch joints, and ensure that the horizontal angle is within 10°. Refer to the right
side picture:
6) To avoid oil accumulation in the outdoor unit, please install the branching pipes properly.
7) To ensure even distribution of refrigerant, pay attention to the distance between the branch pipe
subassembly and the horizontal straight pipe.
a. Ensure that the distance between the bending point of copper pipe and the horizontal straight pipe section of
the adjacent branch pipe is larger than or equal to 1.64ft.(0.5m).
b. Ensure that the distance between the horizontal straight pipe sections of the two adjacent branch pipes is
larger than or equal to 1.64ft.(0.5m).
c. Ensure that the distance between the branch pipe and the horizontal straight pipe section used to connect
the indoor unit is larger than or equal to 1.64ft.(0.5m).
10°
10°
A
CorrectWrong
U-shaped branching pipe
Horizontal surface
A direction view
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