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SiEN34-705
4. Precautions when connecting piping between outdoor units (In case of multi system)
Installation Manual
The Outdoor unit multi connection piping kit (sold separately) is needed to connect piping
between outdoor units in multi system. Only proceed with piping work after considering the
limitations on installation listed here and in "5. Branching the refrigerant piping", always
referring to the kit's installation manual.
(1) The piping between outdoor units must be installed level (Pattern 1) or with a rise
(Pattern 2). Otherwise oil may pool in the pipes.
Pattern 1
Level
Pattern 2
Rise
Prohibited pattern
Downward inclination
Heat Pump / Cooling Only 50Hz (RX(Y)Q5~54P)
Front connections
to indoor unit
Piping between outdoor units
Side (bottom) connections
to indoor unit
Piping between outdoor units
Front connections
to indoor unit
Side (bottom) connections
to indoor unit
Change to pattern 1 or pattern 2
Front connections
to indoor unit
Side (bottom) connections
to indoor unit
Downward inclination
Downward inclination
Oil remains in piping
231
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