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3. Piping
3-1 Refrigerant pipe installation
□(1) The requirements for pipe diameter, pipe length, and lapse height between the indoor and outdoor units are
shown in the table below.
System example:
Outdoor unit model RAC-112SQB RAC-125/140/160SQB
Total pipe length: L 70 75
Max. lapse height between the
outdoor unit and indoor unit:
H
When the outdoor unit is
higher than the indoor unit.
30 30
When the outdoor unit is
lower than the indoor unit.
20 20
(2) Refrigerant pipe size
●Indoor unit ●Outdoor unit
Capacity Level
Refrigerant Pipe Size
(mm)
Gas Side Liquid Side
112, 125, 140,160 Φ15.88
Φ6.35
Φ9.53
Refrigerant Pipe Size
(mm)
Gas Side Liquid Side
Φ15.88 Φ9.53
The diagram shows one outdoor unit with four indoor
units.
In this example, only one refrigerant pipe is used. In
actual installation, however, separate pipes should be
used for refri
erant and refri
eration oil.
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