Daikin VRV IV+ RYYQ8U7Y1B Series Installer And User Manual page 72

17 | Piping installation
F: Piping between refrigerant branch kit and branch selector box (BP box)
Installer and user reference guide
72
a
b
a Outdoor unit
b Main pipes (increase if the equivalent piping length is ≥90 m)
c First refrigerant branch kit
d Piping between refrigerant branch kit and indoor unit
e Indoor unit
HP class
8
10
12+14
16
18~22
24
26~34
36~54
(a)
If the size-up size is NOT available, you must use the standard size. Sizes bigger than the
size-up size are NOT allowed. But even if you use the standard size, the equivalent piping
length is allowed to be more than 90 m.
(b)
Pipe size-up is NOT allowed.
▪ 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)
6.4/9.5/12.7
15.9
19.1/22.2
28.6
34.9
41.3
▪ 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
"17.4.3 To determine the additional refrigerant
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).
e
d
c
Size up
Piping outer diameter size (mm)
Gas pipe
19.1 → 22.2
(a)
22.2 → 25.4
(b)
28.6
(a)
28.6 → 31.8
(b)
34.9
(a)
34.9 → 38.1
(b)
41.3
Minimal thickness t (mm)
Liquid pipe
9.5 → 12.7
12.7 → 15.9
15.9 → 19.1
19.1 → 22.2
0.80
0.99
0.80
0.99
1.21
1.43
4
amount" [ 97].
RYYQ+RYMQ+RXYQ
VRV IV+ heat pump
4P546228-1C – 2021.11