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Special requirements for R32 units
Installer and user reference guide
51
BS4~12A14AJV1B
VRV 5 branch selector unit
4P695527-1 – 2022.02
c
Extraction fan output terminal – NOT connected
d
Extraction fan output terminal – connected
e
Transmission wiring terminal
f
Extraction fan
A
Outdoor unit A
B
Outdoor unit B
Transmission wiring
Extraction fan output wiring
An online tool (
) is available to find the required pressure capacity for
selecting the correct fan size. Only use this online tool for the calculation.
BS unit test run
Before BS unit operation, it is required to perform a test run that simulates a
refrigerant leak. See
101] for more details.
Field settings
Multiple BS units in parallel – 1 extraction fan
Code
Description
Value
[2-0]
Cluster indication
1: enable
[2-1]
Cluster number
#
(a)
[2-2]
Cluster configuration
0 (default): parallel
[2-4]
Safety measures
1 (default): enable
[2-7]
Ventilated enclosure
1 (default): enable
(a)
Assign a unique cluster number to each cluster in the system. All BS units in the same
cluster MUST have the same cluster number.
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
91].
Multiple BS units in series – 1 extraction fan
In this configuration, multiple BS units are connected in series to a single extraction
fan. The air flows through every BS unit to the extraction fan. In case of a
refrigerant leak in any BS unit, the dampers of all BS units will open and allow air
evacuation to the extraction fan.
a
a
a
d
b
c
c
b
b
a
BS unit
b
Ductwork
c
EKBSDCK
d
Extraction fan
It is sufficient to connect the extraction fan circuit to only 1 BS unit of the cluster
(see
"16.5 To connect the external outputs"
88]). It is not allowed to have BS
units in the same series cluster that belong to different outdoor unit systems.
Example
a
a
a
f
c
e
c
e
d
e
A
e