Daikin VRV IV+ Installer And User Reference Manual page 72

18 | Piping installation
A, B, C: Piping between outdoor unit and (first) refrigerant branch kit
D: Piping between refrigerant branch kits or refrigerant branch kit and BS unit
E: Piping between refrigerant branch kit or BS unit and indoor unit
Installer and user reference guide
72
Choose from the following table in accordance with the outdoor unit total capacity
type, connected downstream.
Outdoor unit capacity
type (HP)
5~8
10
12
14~16
18
20~22
24
26~34
36
38~54
Choose from the following table in accordance with the indoor unit total capacity
type, connected downstream. Do not let the connection piping exceed the
refrigerant piping size chosen by the general system model name.
Indoor unit capacity index
<150
150≤x<200
200≤x<290
290≤x<420
420≤x<640
640≤x<920
≥920
Example:
▪ Downstream capacity for E=[capacity index of unit 1]
▪ Downstream capacity for D=[capacity index of unit 1]+[capacity index of unit 2]
Pipe size for direct connection to indoor unit must be the same as the connection
size of the indoor unit (in case indoor unit is VRV DX indoor or Hydrobox).
Indoor unit capacity index
15~50
Piping outer diameter size (mm)
Liquid pipe Suction gas pipe High pressure/
9.5 19.1
9.5 22.2
12.7 28.6
12.7 28.6
15.9 28.6
15.9 28.6
15.9 34.9
19.1 34.9
19.1 41.3
19.1 41.3
Piping outer diameter size (mm)
Liquid pipe Suction gas pipe High pressure/
9.5 15.9
19.1
22.2
12.7 28.6
15.9
19.1 34.9
41.3
Piping outer diameter size (mm)
Gas pipe
12.7
low pressure gas
pipe
15.9
19.1
19.1
22.2
22.2
28.6
28.6
28.6
28.6
34.9
low pressure gas
pipe
12.7
15.9
19.1
28.6
Liquid pipe
6.4
REYQ8~20+REMQ5U7Y1B
VRV IV+ heat recovery
4P561154-1A – 2020.10