Daikin VRV II Series, Design, Installation & Testing Instructions, Page: 121 / 242

Si39-303 Appendix
General Information 115
7.5 Pipe size selection
For an outdoor unit multi installation (RXYQ18
~
48MY1B), make the settings in accordance
with the following figure.
Piping between outdoor unit and refrigerant branch kit (part A)
!
Match to the size of the connection piping on the outdoor unit.
Outdoor unit connection piping size
(Unit:mm)
Piping between refrigerant branch kits
!
Choose from the following table in accordance with the total capacity of all the indoor units
connected below this.
!
Do not let the connection piping exceed the refrigerant piping size chosen by general system
model name.
(Unit:mm)
Piping between outdoor branches (part B)
!
Choose from the following table in accordance with the total capacity of all the outdoor units
connected below this.
(Unit:mm)
Piping between outdoor branch
and indoor unit (part C)
Oil-equalizing line (part D)
Piping between outdoor branches (part B)
Piping between outdoor unit and refrigerant
branch kit (part A)
Outdoor unit capacity type
Piping size (outer diameter)
Gas pipe Liquid pipe
RXYQ5 type ø15.9
ø9.5 RXYQ8 type ø19.1
RXYQ10 type ø22.2
RXYQ12,14,16 type
ø28.6
ø12.7
RXYQ18 ~ 22 type
ø15.9
RXYQ24 type
ø34.9
RXYQ26 ~ 34 type
ø19.1
RXYQ36 ~ 48 type ø41.3
Indoor capacity index
Piping size (outer diameter)
Gas pipe Liquid pipe
< 200 ø15.9
ø9.5
200
≤
x
≤
290 ø22.2
290
≤
x
≤
420
ø28.6
ø12.7
420
≤
x < 640 ø15.9
640
≤
x < 920 ø34.9
ø19.1
920 < ø41.3
Outdoor capacity index
Piping size (outer diameter)
Gas pipe Liquid pipe
< 22HP ø28.6
ø15.9
24HP
ø34.9
26HP < ø19.1