Daikin VRV 5 RXYA8A7Y1B Installer And User Manual page 92

18 | Piping installation
A, B: Piping between outdoor unit and (first) refrigerant branch kit
C: Piping between refrigerant branch kit and SV units OR between two refrigerant branch kits
OR between two SV units
D: Piping between refrigerant branch kit or SV unit and indoor unit
Installer and user reference guide
92
A~D Piping
Choose from the following table in accordance with the outdoor unit total capacity
type. Pipe A is in case of multi-connection the sum of the outdoor units connected
upstream. In case there is no first indoor branch kit (c), pipe A is connected to the
first SV unit or VRV DX indoor unit.
HP class
5~10
12~14
16~20
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.
Example
▪ Downstream capacity for C' = [capacity index of unit a1] + [unit a2] + [unit a3] +
[unit a4] + [unit a5] + [unit a6] + [unit a7]
▪ Downstream capacity for C'' = [capacity index of unit a3] + [unit a4]
▪ Downstream capacity for C''' = [capacity index of unit a10] + [unit a11]
Indoor unit capacity index
<150
150≤x<290
290≤x<392
392≤x<620
620≤x≤650
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).
Indoor unit capacity index
10~32
40~80
100~140
200~250
Piping outer diameter [mm]
Gas pipe
19.1
22.2
28.6
Piping outer diameter [mm]
Gas pipe
15.9
19.1
22.2
28.6
Piping outer diameter [mm]
Gas pipe
9.5
12.7
15.9
19.1
Liquid pipe
9.5
12.7
Liquid pipe
9.5
12.7
15.9
Liquid pipe
6.4
9.5
RYMA5+RXYA8~20A7Y1B
VRV 5 heat pump
4P749918-1 – 2023.12