To Select Refrigerant Branch Kits - Daikin VRV IV W+ Series Installer And User Reference Manual

18 | Piping installation
F: Piping between refrigerant branch kit and branch selector box (BP box)
G: Piping between branch selector box (BP box) and RA DX indoor unit

18.1.4 To select refrigerant branch kits

Installer and user reference guide
68
HP class
8
10
12+14
16
18~22
24
26~34
36~42
Heat pump system in case of single outdoor unit
Pipe size for direct connection on branch selector box (BP*) must be based on the
total capacity of the connected indoor units (only in case RA DX indoor units are
connected).
Total capacity index of
connected indoor units
20~62
63~149
150~208
Example:
Downstream capacity for F=[capacity index of unit 4]+[capacity index of unit 5]
Heat pump system in case of single outdoor unit
Only in case RA DX indoor units are connected.
Indoor unit capacity index
20, 25, 30
50
60
71
Refrigerant refnets
For piping example, refer to
▪ When using refnet joints at the first branch counted from the outdoor unit side,
choose from the following table in accordance with the capacity of the outdoor
unit (example: refnet joint a).
Size up
Liquid piping outer diameter size (mm)
9.5 → 12.7
12.7 → 15.9
15.9 → 19.1
19.1 → 22.2
Piping outer diameter size (mm)
Gas pipe
12.7
15.9
19.1
Piping outer diameter size (mm)
Gas pipe
9.5
12.7
15.9
"18.1.3 To select the piping
Liquid pipe
6.4
9.5
Liquid pipe
6.4
9.5
4
size" [ 65].
RWEYQ8~14T9Y1B
VRV IV water-cooled system air conditioner
4P452191-1B – 2020.10