Daikin VRV IV Q+ Series Installer And User Reference Manual page 96

18 | Piping installation
Installer and user reference guide
96
Model
If
8 HP N≥4
10 HP N≥5
12 HP N≥6
14 HP N≥7
16 HP N≥8
18 HP N≥9
20 HP N≥10
(a) In case of a multi-outdoor-unit system, add the sum of the individual outdoor unit
charge factors.
CR Total indoor unit capacity connection ratio
N Number of VRV DX and RA DX indoor units connected to the outdoor unit
Parameter C – Example with multiple outdoor units:
500
8 HP 12 HP
200 300
#
1 Determine the connection ratio:
▪ Total outdoor unit capacity class = 500
▪ Total indoor unit capacity class = 550
=> CR≥100%
2 Determine parameter C:
▪ N=5
▪ 8 HP: N≥4 => C1=N×0.1=5×0.1 kg
▪ 12 HP: N<6 => C2=0 kg
=> C=C1+C2=0.5 kg
Metric piping. When using metric piping, replace the weight factors in the formula
by the ones from the following table:
Inch piping
Piping
Ø6.4 mm
Ø9.5 mm
Ø12.7 mm
Ø15.9 mm
Ø19.1 mm
Ø22.2 mm
Parameter C
CR≥100%
Then
C=N×0.1 kg
550
125 125 125 125 50
Action
Weight factor
0.022
0.059
0.12
0.18
0.26
0.37
(a)
If Then
N<4 C=0 kg
N<5
N<6
N<7
N<8
N<9
N<10
Metric piping
Piping Weight factor
Ø6 mm
Ø10 mm
Ø12 mm
Ø15 mm
Ø16 mm
Ø18 mm
Ø22 mm
VRV IV Q+ series heat pump
4P546229-1A – 2020.10
CR<100%
C=0 kg
0.018
0.065
0.097
0.16
0.18
0.24
0.35
RXYQQ8~20U7Y1B