BGH BV-V28W/DHN1 Manual page 89

VRF 50/60Hz
4.6 Branch Joints
Notes for installers
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
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, 3.7 "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.
88

of refrigerant and
Figure 3-4.8: Branch joint orientation
possible