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

18 | Piping installation
G: Piping between branch selector box (BP box) and RA DX indoor unit

18.1.4 To select refrigerant branch kits

Installer and user reference guide
72
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).
Outdoor unit capacity type (HP)
8+10
12~22
24~42
▪ For refnet joints other than the first branch (example refnet joint b), select the
proper branch kit model based on the total capacity index of all indoor units
connected after the refrigerant branch.
Indoor unit capacity index
<200
200≤x<290
290≤x<640
≥640
▪ Concerning refnet headers, choose from the following table in accordance with
the total capacity of all the indoor units connected below the refnet header.
Indoor unit capacity index
<200
200≤x<290
290≤x<640
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
"To select the piping size" [
Liquid pipe
6.4
9.5
Liquid pipe
6.4
9.5
4
69].
2 pipes
KHRQ22M29T9
KHRQ22M64T
KHRQ22M75T
2 pipes
KHRQ22M20T
KHRQ22M29T9
KHRQ22M64T
KHRQ22M75T
2 pipes
KHRQ22M29H
(a)
KHRQ22M64H
RXMLQ8 + RXYLQ10~14T7Y1B*
VRV IV system air conditioner
4P543427-1A – 2020.10