18
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Piping installation
Installer and user reference guide
68
RWEYQ8~14T9Y1B
VRV IV water-cooled system air conditioner
4P452191-1B – 2020.10
Size up
HP class
Liquid piping outer diameter size (mm)
8
9.5 → 12.7
10
12+14
12.7 → 15.9
16
18~22
15.9 → 19.1
24
26~34
19.1 → 22.2
36~42
F: Piping between refrigerant branch kit and branch selector box (BP box)
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
Piping outer diameter size (mm)
Gas pipe
Liquid pipe
20~62
12.7
6.4
63~149
15.9
9.5
150~208
19.1
Example:
Downstream capacity for F=[capacity index of unit 4]+[capacity index of unit 5]
G: Piping between branch selector box (BP box) and RA DX indoor unit
Heat pump system in case of single outdoor unit
Only in case RA DX indoor units are connected.
Indoor unit capacity index
Piping outer diameter size (mm)
Gas pipe
Liquid pipe
20, 25, 30
9.5
6.4
50
12.7
60
9.5
71
15.9
18.1.4 To select refrigerant branch kits
Refrigerant refnets
For piping example, refer to
"18.1.3 To select the piping size"
65].
▪
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).