Piping; Refrigerant Pipe Installation - Hitachi RAC-112SQB Installation Manual

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:
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 refrigerant and refrigeration oil.
Outdoor unit model
Total pipe length: L
Max. lapse height between the
outdoor unit and indoor unit:
H
(2) Refrigerant pipe size
●Indoor unit
Capacity Level
112, 125, 140,160
When the outdoor unit is
higher than the indoor unit.
When the outdoor unit is
lower than the indoor unit.
Refrigerant Pipe Size
(mm)
Gas Side Liquid Side
Φ6.35
Φ15.88
Φ9.53
RAC-112SQB
70
30
20
●Outdoor unit
Refrigerant Pipe Size
(mm)
Gas Side Liquid Side
Φ15.88 Φ9.53
8
RAC-125/140/160SQB
75
30
20