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Special requirements for R32 units
Installer and user reference guide
50
BS4~12A14AJV1B
VRV 5 branch selector unit
4P695527-1 – 2022.02
Select a fan with the required flow of 115 m³/h and a total pressure rise of
123.5 Pa.
Note:
For ease of installation, we recommend to use in-line duct fans.
BS unit test run
Before BS unit operation, it is required to perform a test run that simulates a
refrigerant leak. See
Field settings
1 BS unit – 1 extraction fan
Code
Description
Value
[2-0]
Cluster indication
0 (default): disable
[2-4]
Safety measures
1 (default): enable
[2-7]
Ventilated enclosure
1 (default): enable
Note:
Some field settings need to be made on all main PCBs (A1P, A2P and A3P) of
the same BS unit. For more information, see
Multiple BS units in parallel – 1 extraction fan
In this configuration, multiple parallel BS units are connected to a single extraction
fan. Each BS unit benefits from a direct airflow path to the extraction fan. In case of
a refrigerant leak in any BS unit, the damper of that BS unit will open and allow
direct air evacuation to the extraction fan. The dampers of the other BS units
remain closed.
a
1
a
2
a
...
b
c
a
#
BS unit #
b
Ductwork
c
Extraction fan
It is sufficient to connect the extraction fan circuit to only 1 BS unit of the cluster
(=BS units that belong to the same ductwork and extraction fan) (see
88]). If in a cluster there are BS units that belong
to different outdoor unit systems, the fan circuit must be connected to 1 BS 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
BS unit belonging to outdoor unit A
b
BS unit belonging to outdoor unit B
