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5.7 Piping Connections between Outdoor Units
The piping connecting the outdoor units should be horizontal and must not be higher than the refrigerant outlets. If
necessary, to avoid obstacles the piping may be vertically offset below the outlets. When inserting a vertical offset to avoid
an obstacle, the whole outdoor piping should be offset, rather than just the section adjacent to the obstacle. Refer to
Figure 3-5.10.
Figure 3-5.10: Piping connections between outdoor units
Outdoor piping should be installed in a metal casing to protect against exposure to sunlight, rain, wind and other potential
causes of damage.
5.8 Pipe Flushing
5.8.1 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, 5.1.1“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.