Daikin VRV 5-S Series - 19.4 Determining Additional Refrigerant Amount

19 | Charging refrigerant
Installer and user reference guide
96
RXYSA4~6A7V/Y1B
VRV 5-S system air conditioner
4P600330-1 – 2020.01
19.4 To determine the additional refrigerant amount
WARNING
The maximum allowable total refrigerant amount is determined based on the
smallest room being served by the system.
See "3.1.2System layout requirements"[419] to determine the maximum allowable
total refrigerant amount.
INFORMATION
For final charge adjustment in a test laboratory, contact your dealer.
INFORMATION
Note down the amount of additional refrigerant that is calculated here, for later use
on the additional refrigerant charge label. See "19.7 To fix the fluorinated
greenhouse gases label"[499].
Formula:
R=[(X
1
×Ø9.5)×0.053+(X
2
×Ø6.4)×0.020]
R Additional refrigerant to be charged [in kg and rounded off to 1 decimal place]
X
1...2
Total length [m] of liquid piping size at Øa
Metric piping. When using metric piping, replace the weight factors in the formula
by the ones from the following table:
Inch piping Metric piping
Piping Weight factor Piping Weight factor
Ø6.4mm 0.020 Ø6mm 0.016
Ø9.5mm 0.053 Ø10mm 0.058
Connection ratio requirements. When selecting indoor units, the connection ratio
must comply with the following requirements. For more information, see the
technical engineering data.
Indoor units Total CR
(a)
VRVDX 50~130%
(a)
Total CR = Total indoor unit capacity connection ratio