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.
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 and to the MS box. That is, pipe flushing should be performed before connecting refrigerant
piping to MS box and indoor units to prevent impurities from blocking the MS box and indoor units.
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