Daikin VRV II Series - Page 178

Refrigerant Piping Si39-303
172 Installation Manual
2. To avoid the risk of oil retention to the stopping unit side, always connect the shutoff valve
and the piping between outdoor units as shown in the figure A or figure B.
3. If the piping length between the outdoor unit-connecting pipe kits or between the outdoor
units exceeds 2 m, create a rise of 200 mm or more in the gas line within a length of 2 m
from the kit.
A
B
A
B
Prohibited pattern
to indoor unit
to indoor unit
Oil collects to the stopping outdoor unit.
Change to pattern 1 or pattern 2
Unit A Unit B
Unit C
Unit C
Unit A Unit B
to indoor unit
Change as shown in the figure below.
to indoor unit
to indoor unit
to indoor unit
Oil collects to the outdoor unit C when the system stops.
Rising height:
200 mm or more
to indoor
unit
If 2 m or less
If 2 m or more
Piping between outdoor units
Piping between
outdoor units
Piping between
outdoor units
to indoor unit
2m or less
2m or less
2m
or more
Rising height:
200 mm or more
Rising height:
200 mm or more
Rising height:
200 mm or more
2m or less2m or less