13
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Special requirements for R32 units
Installer and user reference guide
52
BS4~12A14AJV1B
VRV 5 branch selector unit
4P695527-1 – 2022.02
a
b
b
f
d
e
c
e
d
e
A
e
B
e
a
BS unit belonging to outdoor unit A
b
BS unit belonging to outdoor unit B
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
Allowed
NOT allowed
The option kit EKBSDCK is required each time a duct is connected to the air inlet
(damper side) of the BS unit.
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
Field settings
Multiple BS units in series – 1 extraction fan
Code
Description
Value
[2-0]
Cluster indication
1: enable
[2-1]
Cluster number
#
(a)
[2-2]
Cluster configuration
1: series
[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
13.5 Combinations of ventilated enclosure configurations
It is possible to combine different ventilated enclosure configurations (clusters) in
the same system. To do this, assign a unique cluster value to each cluster. All the
BS units in the same cluster need to be assigned the same cluster number.
