To Select Refrigerant Branch Kits - Daikin VRV IV+ Installer And User Reference Manual

F: Piping between refrigerant branch kit and branch selector box (BP box)
G: Piping between branch selector box (BP box) and RA DX indoor unit

5.3.3 To select refrigerant branch kits

RYYQ+RYMQ+RXYQ8~20U7Y1B
VRV IV+ heat pump
4P546228-1A – 2019.10
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
"6.7.3 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).
Total capacity index of
connected indoor units
20~62
63~149
150~208
Example:
Downstream capacity for F=[capacity index of unit 4]+[capacity index of unit 5]
Only in case RA DX indoor units are connected.
Indoor unit capacity index
20, 25, 30
50
60
71
Refrigerant refnets
For piping example, refer to
▪ 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).
Minimal thickness t (mm)
amount" [
Piping outer diameter size (mm)
Gas pipe
12.7
15.9
19.1
Piping outer diameter size (mm)
Gas pipe
9.5
12.7
15.9
"5.3.2 To select the piping
5 Preparation
|
0.80
0.99
0.80
0.99
1.21
1.43
4
64].
Liquid pipe
6.4
9.5
Liquid pipe
6.4
9.5
4
size" [ 31].
Installer and user reference guide
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