Daikin VRV 5 RXYA8A7Y1B Installer And User Manual page 76

16 | Special requirements for R32 units
Installer and user reference guide
76
A
≤ 100 mm
A Minimal natural ventilation area
nvmin
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
- The area of any openings above 300 mm from the floor does not count when
determining A
nvmin
- At least 50% of A
nvmin
- 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
- 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" [
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.
nvmin
≥ 50% A
nvmin
)
nvmin
is less than 200 mm above the floor
nvmin
≥ 20 mm
≥ 20 mm
)
4
73].
RYMA5+RXYA8~20A7Y1B
4P749918-1 – 2023.12
VRV 5 heat pump