Daikin VRV 5-S - Shut-Off Valves

16 | Special requirements for R32 units
Installer and user reference guide
72
RXYSA8~12AMY1B
VRV 5-S system air conditioner
4P752782-1A – 2024.02
For the lower opening:
- It is not an opening to the outside
- The opening cannot be closed
- The opening must be ≥0.012m² (A
nvmin
)
- The area of any openings above 300mm from the floor does not count when
determining A
nvmin
- At least 50% of A
nvmin
is less than 200mm above the floor
- The bottom of the lower opening is ≤100mm from the floor
- The height of the opening is ≥20mm
For the upper opening:
- It is not an opening to the outside
- The opening cannot be closed
- The opening must be ≥0.006m² (50% of A
nvmin
)
- The bottom of the upper opening must be ≥1500mm above the floor
- The height of the opening is ≥20mm
Note: The requirement for the upper opening can be met by false ceilings,
ventilation ducts or similar arrangements that provide an airflow path between the
connected rooms.
Example
The total amount of refrigerant in the VRV system is 20 kg. The VRV system has
two indoor units which are installed in a space that does not belong to the lowest
underground floor of the building. The space in which the indoor units are installed
has a room area of 25m². An adjacent room has a room area of 45m² to which air
circulation is possible through a partition that meets one of the two requirements
in the above text. The safety measure chosen is Alarm + Natural ventilation (based
on the total amount of refrigerant and room area from the graph for “All other
floors”).
1 To apply the Alarm safety measure, see "16.4.2Alarm"[468].
2 In addition, apply the Natural ventilation safety measure: total room areas of
installed room and adjacent room where natural ventilation can be made:
25m²+45m²=70m²
- Total refrigerant charge limit for the system determined using the graph for
natural ventilation is 23.6kg.
Total amount of refrigerant in the system (20kg) < Total refrigerant charge limit
(23.6kg), which means that the safety measure can be applied.
16.4.4 Shut-off valves
In case shut-off valves are required as a safety measure, SV unit which has shut-off
valves needs to be installed to reduce the amount of refrigerant leakage in to the
room where the indoor unit is installed.
For installation of the SV unit, refer to the installation and operation manual
delivered with the SV unit.
The maximum amount of charge limit and so the maximum capacity class of indoor
unit which is allowed to install in the room is determined as below.