Daikin VRV 5-S Series - Page 68

16 | Special requirements for R32 units
Installer and user reference guide
68
RXYSA4~6A7V/Y1B
VRV 5-S system air conditioner
4P600330-1D – 2023.02
(b) Lowest underground floor
(=Lowest underground floor)
(c) Effective installation height
(=Effective installation height)
Step3 – Determine the total amount of refrigerant in the system:
Contains fluorinated greenhouse gases
2
1
1
1
2
2
kg
tCO
2
eq
1000
GWP × kg
=
=
+
kg
=
kg
=
GWP: xxx
R32
Total charge=Factory charge +additional charge =3.4kg+R
(a)
(a)
The R value is calculated in "19.4To determine the additional refrigerant amount"[499].
Step4 – The total refrigerant charge in the system MUST be less than the lowest
value of the refrigerant charge limit for each room where an indoor unit is installed
or that is served by a ducted indoor unit installed in a different room. If NOT,
change the installation (see choices below) and repeat all of the above steps.
1. Increase the area of the room restricting the total charge.
OR
2. Decrease the piping length by changing the system layout.
OR
3. Increase the installation height of the unit or the duct.
OR
4. Add additional countermeasures as described in applicable legislation.
SVS output or optional output PCB for indoor unit can be used to
connect and activate the additional countermeasures (e.g. mechanical
ventilation). For more information, see "20.3To connect the external
outputs"[4115].
OR
5. Fine-tune system with more detailed calculations in VRV Xpress.
NOTICE
The total refrigerant charge amount in the system MUST always be lower than the
number of connected indoor units ×15.96 [kg], with a maximum of 63.84kg.
E.g. In a system with one indoor unit, the maximum refrigerant charge amount is:
1×15.96=15.96kg.
Example1:
Room
A B C D
Area [m²] 20 30 50 50
Installation height [m] 3.5 2.2 1.8 2.5
Lowest underground floor — — ● ●
Other floors ● ● — —
Charge limit [kg] 15.7 15.1 16.9 19.2