Daikin SV1A25AJV1B - Page 47

13 | Special requirements for R32 units
Installer and user reference guide
47
SV1A25AJV1B+SV4~8A14AJV1B
VRV 5 safety valve unit
4P749917-1 – 2023.09
Use the total amount of refrigerant in the system and the area of the room in
which the SV unit is installed to check which safety measure is required.
Note: When "No safety measure" is required, it is still allowed to apply natural
ventilation or install an external alarm or ventilated enclosure if wanted. Follow the
respective instructions as described further below.
Note: When natural ventilation is required, it is still allowed to install an external
alarm or ventilated enclosure if wanted. Follow the respective instructions as
described further below.
Note: When an external alarm is required as safety measure, it is also allowed to
install a ventilated enclosure. Follow the instructions described further below.
Use the first graph (Lowest underground floor
(a)
) in case the SV unit is installed in
the lowest underground floor of a building. For other floors, use the second graph
(All other floors
(b)
).
OTHER FLOORS
LOWEST UNDERGROUND FLOOR
The graphs and table are based on an installation height of the SV unit between
1.8m and 2.2m. The installation height is the height of the bottom of the SV unit
to the floor. See also "14.1.1Installation site requirements of the unit"[463].
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 (VRV Xpress).
NOTICE
SV units 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 SV units are installed
in spaces that do NOT belong to the lowest underground floor of the building. The
space in which the first SV unit is installed has a room area of 50m², the space in
which the second SV 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 Required safety measure
1 A=50m²≥40m² No safety measures
2 A=15m²<40m² Ventilated enclosure OR
External alarm + natural ventilation