Midea
V6-i Series Engineering Data Book
4.6 Branch Joints
4.7 Pipe Flushing
4.7.1 Purpose
To remove dust, other particles and moisture, which could cause compressor malfunction if not flushed out before the
system is run, the refrigerant piping should be flushed using nitrogen. As described in Part 3, 4.1.1 “Installation procedure”,
pipe flushing should be performed once the piping connections have been completed with the exception of the final
connections to the indoor units. That is, flushing should be performed once the outdoor units have been connected but
before the indoor units are connected.
Use U-shaped branch joints as specified on the
construction drawings – do not replace U-shaped branch
joints with tee joints.
Indoor branch joints may be installed either horizontally or
vertically. Horizontal branch joints must be installed at an
angle to the horizontal not exceeding 10° in order to avoid
uneven distribution of refrigerant and possible
malfunction. Refer to Figure 3-4.8.
To ensure even distribution of refrigerant, a limitation is
placed on how close branch joints may be installed to
bends, other branch joints and the straight sections of
piping leading to indoor units. Refer to Part 3, 3.6
Figure 3-4.8: Branch joint orientation
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