Daikin VRV IV+ - Page 73

18 | Piping installation
Installer and user reference guide
73
REYQ8~20+REMQ5U7Y1B
VRV IV+ heat recovery
4P561154-1A – 2020.10
Indoor unit capacity index Piping outer diameter size (mm)
Gas pipe Liquid pipe
63~140 15.9 9.5
200 19.1
250 22.2
▪ If a size-up of the piping is required, refer to the table below.
e
d
b
c
a
a Outdoor unit
b Main pipes (increase size)
c First refrigerant branch kit
d Piping between refrigerant branch kit and indoor unit
e Indoor unit
Size up
HP class Liquid piping outer diameter size (mm)
5~8 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
36~54
▪ The pipe thickness of the refrigerant piping shall comply with the applicable
legislation. The minimal pipe thickness for R410A piping must be in accordance
with the table below.
Pipe Ø (mm) Minimal thickness t (mm)
6.4/9.5/12.7 0.80
15.9 0.99
19.1/22.2 0.80
28.6 0.99
34.9 1.21
41.3 1.43
▪ In case the required pipe sizes (inch sizes) are not available, it is also allowed to
use other diameters (mm sizes), taken the following into account:
- Select the pipe size nearest to the required size.
- Use the suitable adapters for the change-over from inch to mm pipes (field
supply).
- The additional refrigerant calculation has to be adjusted as mentioned in "To
determine the additional refrigerant amount"[498].