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13 Special requirements for R32 units
13.3
To determine the required safety
measures
Step 1 – Determine the total amount of refrigerant in the system.
Use the values on the unit nameplate to determine the total amount
of refrigerant in the system.
Contains fluorinated greenhouse gases
R32
=
1
GWP: xxx
2
=
2
1
+
1
2
=
GWP × kg
=
1000
Total charge=Factory charge
(a)
The factory charge value can be found on the nameplate.
(b)
The R value (additional refrigerant to be charged) is calculated in
"16.2 To determine the additional refrigerant
NOTICE
The total refrigerant charge amount in the system MUST
always be lower than 79.8 kg.
Step 2 – Determine the smallest area out of:
▪ The room where an indoor unit is installed
▪ Each of the rooms served by a ducted indoor unit installed in a
different room
The room area can be determined by projecting the walls, doors and
partitions to the floor and calculating the enclosed area. Spaces
connected by only false ceilings, ductwork, or similar connections
are not considered a single space.
Step 3 – Use the graphs or tables (see
beginning of this manual) to determine the required safety measures
for the indoor unit.
m
Total refrigerant charge in the system [kg]
A
Minimum room area [m²]
min
(a)
Lowest underground floor (=Lowest underground floor)
(b)
All other floors (=All other floors)
(c)
No safety measure (=No safety measure)
(d)
Alarm OR Natural ventilation (=Alarm OR Natural
ventilation)
(e)
NOT allowed (=NOT allowed)
(f)
Alarm + shut-off valve [SV unit] OR Alarm + natural
ventilation (=Alarm + shut-off valve [SV unit] OR Alarm +
natural ventilation)
Use the total amount of refrigerant in the system and the smallest
area of the room in which the indoor unit is installed/conditioning to
check which safety measure is required.
Note: When "No safety measure" is required, it is still allowed to
apply natural ventilation or alarm or shut-off valve (SV unit) if
wanted. Follow the respective instructions as described further
below.
Note: When natural ventilation is required, it is still allowed to apply
alarm or shut-off valve (SV unit) if wanted. Follow the respective
instructions as described further below.
Note: When alarm + natural ventilation is required as safety
measure in other floors, it is also allowed to apply alarm + shut-off
valve (SV unit). Follow the instructions described further below.
Use the first graph (Lowest underground floor
unit is installed/conditioning in the lowest underground floor of a
building. For other floors, use the second graph (All other floors
Installation and operation manual
20
kg
kg
kg
tCO
eq
2
(a)
(b)
+additional charge
amount" [ 4 35].
[ 4 3] at the
"Figure 4"
(a)
) in case the indoor
(b)
OTHER FLOORS
LOWEST UNDERGROUND FLOOR
The graphs and table are based on an installation height of the
indoor unit between 1.8 m and 2.2 m (bottom of the indoor unit or
bottom of the duct openings). See
requirements of the outdoor
If the installation height is more than 2.2 m, different boundaries for
the applicable safety measures can apply. To know which safety
measure is required in case the installation height is more than
2.2 m, refer to the online tool
NOTICE
Indoor units and the bottom of duct openings cannot be
installed lower than 1.8 m from the lowest point of the floor.
Example
The total amount of refrigerant in the VRV system is 20 kg. All indoor
units are installed in spaces that do NOT belong to the lowest
underground floor of the building. The space in which the first indoor
unit is installed has a room area of 50 m², the space in which the
second indoor unit is installed has a room area of 15 m².
▪ Based on the graph for "All other floors" (All other floors), the room
area limit is 40 m² for No safety measure" (No safety measures).
▪ This means that the following safety measures are required:
SV unit
Room area
1
A=50 m²≥40 m²
2
A=15 m²<40 m²
A
[m
]
2
min
110
100
90
80
No safety measure
70
60
50
40
30
20
10
0
5
10
m
Total refrigerant charge in the system [kg]
A
Minimum room area [m²]
min
(a)
Lowest underground floor (=Lowest underground floor)
(b)
All other floors (=All other floors)
(c)
No safety measure (=No safety measure)
(d)
Alarm OR Natural ventilation (=Alarm OR Natural ventilation)
(e)
NOT allowed (=NOT allowed)
(f)
Alarm + shut-off valve [SV unit] OR Alarm + natural ventilation
(=Alarm + shut-off valve [SV unit] OR Alarm + natural
).
ventilation)
"14.1.1 Installation site
unit" [ 4 26].
(VRV
Xpress).
Required safety measure
No safety measures
Alarm + natural ventilation OR
Alarm + shut-off valve (SV unit)
(c)
Alarm + shut-off valve [SV unit]
OR
Alarm + natural ventilation
(f)
15
25
35
45
m [kg]
20
30
40
50
RXYSA8~12AMY1B
VRV 5-S system air conditioner
4P752781-1B – 2024.02
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