Daikin VRV 5-S - Page 71

16 | Special requirements for R32 units
Installer and user reference guide
71
RXYSA8~12AMY1B
VRV 5-S system air conditioner
4P752782-1A – 2024.02
The respective room area can be determined by projecting the walls, doors and
partitions to the floor and calculating the enclosed area. Spaces connected only
through false ceilings, ductwork, or similar connections are not considered a single
space.
Step2 – Use the graph or table below to determine the total refrigerant charge:
0
10
20
30
40
50
60
70
80
90
100
110
120
130
140
150
160
170
180
190
200
210
220
230
240
250
50 25 30 35 40 45 50 55 60 65201510 70 75 80
m [kg]
A
1
+ A
min
[m
2
]
A
1
+ A
min
[m²] m [kg]
20 6.7
30 10.1
40
0 0
10 3.3
13.5
50 16.8
60 20.2
70 23.6
80 27.0
90 30.3
100 33.7
110 37.1
120 40.5
130 43.9
140 47.2
150 50.6
160 54.0
170 57.4
180 60.7
190 64.1
200 67.5
210 70.9
220 74.2
230 77.6
236 79.6
237 79.8
240 79.8
250 79.8
m Total refrigerant charge in the system [kg]
A
1
Area of the room with natural ventilation [m²]
A
min
Minimum room area of the space in which the indoor unit is installed [m²]
Note: Round down the derived values.
The graphs and table are based on an installation height of the indoor unit
between 1.8m and 2.2m (bottom of indoor unit or bottom of duct openings).
If the installation height is more than 2.2m, higher total refrigerant charge limit of
the system can apply. To know the total refrigerant charge limit of the system in
case the installation height is more than 2.2 m, refer to the online tool (VRV
Xpress).
Step 3 – The total amount of refrigerant in the system MUST be less than the
refrigerant charge limit derived from the graph above. If NOT, natural ventilation
safety measure is not allowed.
Step4 – The partition between two rooms on the same floor MUST meet one of
the following two requirements for natural ventilation.
1 Rooms on the same floor that are connected with a permanent opening that
extends to the floor and is intended for people to walk through.
2 Rooms on the same floor connected with permanent openings that fulfil the
requirements listed below. The openings must consist out of two parts to allow
air circulation for natural ventilation.
A
nvmin
≥ 20 mm
≥ 50% A
nvmin
≤ 100 mm
1500
mm
300
mm
200
mm
≥ 20 mm
A
nvmin
Minimal natural ventilation area