Pipe Size Selection - Daikin VRV II Series Design, Installation & Testing Instructions

Si39-303
7.5

Pipe size selection

For an outdoor unit multi installation (RXYQ18
with the following figure.
Piping between outdoor unit and refrigerant branch kit (part A)
!
Piping between refrigerant branch kits
!
!
Piping between outdoor branches (part B)
!
General Information
Piping between outdoor branches (part B)
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
Outdoor unit capacity type
RXYQ5 type
RXYQ8 type
RXYQ10 type
RXYQ12,14,16 type
RXYQ18 ~ 22 type
RXYQ24 type
RXYQ26 ~ 34 type
RXYQ36 ~ 48 type
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.
Indoor capacity index
< 200
≤ ≤
200 x 290
≤ ≤
290 x 420
≤
420 x < 640
≤
640 x < 920
920 <
Choose from the following table in accordance with the total capacity of all the outdoor units
connected below this.
Outdoor capacity index
< 22HP
24HP
26HP <
48MY1B), make the settings in accordance
~
Oil-equalizing line (part D)
Piping between outdoor branch
and indoor unit (part C)
Piping size (outer diameter)
Gas pipe
ø15.9
ø19.1
ø22.2
ø28.6
ø34.9
ø41.3
Piping size (outer diameter)
Gas pipe
ø15.9
ø22.2
ø28.6
ø34.9
ø41.3
Piping size (outer diameter)
Gas pipe
ø28.6
ø34.9
Appendix
(Unit:mm)
Liquid pipe
ø9.5
ø12.7
ø15.9
ø19.1
(Unit:mm)
Liquid pipe
ø9.5
ø12.7
ø15.9
ø19.1
(Unit:mm)
Liquid pipe
ø15.9
ø19.1
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