Daikin SV1A25AJV1B - Page 56

13 | Special requirements for R32 units
Installer and user reference guide
56
SV1A25AJV1B+SV4~8A14AJV1B
VRV 5 safety valve unit
4P749917-1 – 2023.09
An online tool (VRV Xpress) is available to find the required pressure capacity for
selecting the correct fan size. Only use this online tool for the calculation.
Field settings
One SV unit – one extraction fan
Code Description Value
[2-0]
(a)
Cluster indication 0 (default): disable
[2-4]
(b)
Safety measures 1 (default): enable
[2-7]
(b)
Ventilated enclosure 1 (default): enable
(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].
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.
Multiple SV units in parallel – one extraction fan
In this configuration, multiple parallel SV units are connected to a single extraction
fan. Each SV unit benefits from a direct airflow path to the extraction fan. In case of
a refrigerant leak in any SV unit, the damper of that SV unit will open and allow
direct air evacuation to the extraction fan. The dampers of the other SV units
remain closed.
a1
a2
a...
b c
a
#
SV unit #
b Ductwork
c Extraction fan
It is sufficient to connect the extraction fan circuit to only one SV unit of the cluster
(=SV units that belong to the same ductwork and extraction fan) (see "16.5 To
connect the external outputs"[498]). If in a cluster there are SV units that belong
to different outdoor unit systems, the fan circuit must be connected to one SV unit
(in the cluster) of each outdoor unit system.
Example
a
a
a
A
c e
c e
d e
e
f
b
a
a
A
c e
d e
d e
e
B
e
f
a SV unit belonging to outdoor unit A
b SV unit belonging to outdoor unit B
c Extraction fan output terminal – NOT connected