Daikin VRV II Series Design, Installation & Testing Instructions page 178

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