Daikin VRV 5 - To Determine the Additional Refrigerant Amount

19 | Charging refrigerant
Installer and user reference guide
110
RXYSA8~12AMY1B
VRV 5-S system air conditioner
4P752782-1A – 2024.02
Global warming potential (GWP) value: 675
Periodical inspections for refrigerant leaks may be required depending on the
applicable legislation. Contact your installer for more information.
NOTICE
Applicable legislation on fluorinated greenhouse gases requires that the refrigerant
charge of the unit is indicated both in weight and CO
2
equivalent.
Formula to calculate the quantity in CO
2
equivalent tonnes: GWP value of the
refrigerant × total refrigerant charge [in kg]/1000
Contact your installer for more information.
19.4 To determine the additional refrigerant amount
WARNING
The maximum indoor capacity index which can be connected to a SV unit port is
determined based on the smallest room served by that port.
In case the system serves the lowest underground floor of a building, there is an
extra limit to the maximum allowable total refrigerant amount. This maximum
refrigerant amount is determined based on the area of the smallest room on the
lowest underground floor.
See "16 Special requirements for R32 units" [4 61] to determine the maximum
allowable total refrigerant amount.
INFORMATION
For final charge adjustment in the test laboratory, please contact your local 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114].
NOTICE
The refrigerant charge of the system must be less than 79.8kg. For factory charge,
refer to the unit name plate.
Formula:
R = [(X
1
× Ø15.9) × 0.16 + (X
2
× Ø12.7) × 0.10 + (X
3
× Ø9.5) × 0.053 + (X
4
× Ø6.4) ×
0.020] + A
R Additional refrigerant to be charged [kg] (rounded off to one decimal place)
X
1...4
Total length [m] of liquid piping size at Øa
A Parameter A (see below)
INFORMATION
When using more than one SV unit, add the sum of the individual SV unit charge
factors.
▪ Parameter A: Individual SV unit charge factors
Model Parameter A
SV1A 0.4kg