Daikin SV1A25AJV1B - Ventilated Enclosure

13 | Special requirements for R32 units
Installer and user reference guide
52
SV1A25AJV1B+SV4~8A14AJV1B
VRV 5 safety valve unit
4P749917-1 – 2023.09
Example
The total amount of refrigerant in the VRV system is 20kg. The VRV system has one
SV unit which is installed in space that does not belong to the lowest underground
floor of the building. The space in which the SV unit is 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 External alarm + Natural ventilation instead of
Ventilated enclosure (based on the total amount of refrigerant and room area from
the graph for “All other floors”).
1 To apply the External alarm safety measure, see "13.4.2 External
alarm"[449].
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.
Field settings
Natural ventilation
Code Description Value
[2-0]
(a)
Cluster indication 0 (default): disable
[2-4]
(b)
Safety measures 0: disable
(a)
Set on ALL main PCBs (A1P and A2P) of the SV unit.
(b)
Set ONLY on the LEFTMOST main PCB (A1P) of the SV unit.
Note: For more information, see "17.1Making field settings"[4100].
Note: If the natural ventilation safety measure is used in conjunction with the
external alarm safety measure, then the field settings for external alarm safety
measure MUST be made during configuration.
SV unit test run
Before SV unit operation, it is required to perform a test run that simulates a
refrigerant leak. See "18.3SV unit test run"[4110] for more details.
13.4.4 Ventilated enclosure
WARNING
If the ventilated enclosure safety measure is applied, the SV unit must have its own
ductwork and extraction fan. Do NOT combine this ductwork with ducting for other
purposes.
A ventilated enclosure is required as a safety measure in case other safety
measures (see "13.4.1 No safety measure" [4 49], "13.4.3 Natural
ventilation"[450] and "13.4.2External alarm"[449]) are not allowed.
For the ventilated enclosure safety measure, ductwork and an extraction fan MUST
be installed. See "14.5Installing the ventilation ducting"[472] for ductwork (field
supply) installation and "16.5 To connect the external outputs"[498] to connect
the extraction fan circuit (field supply) to the SV unit.