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Special requirements for R32 units
Installer and user reference guide
46
BS4~12A14AJV1B
VRV 5 branch selector unit
4P695527-1 – 2022.02
For the external alarm safety measure, the duct connection must be replaced with
the duct closing plate accessory (see
"14.5.2 To install the duct closing
66]).
An external alarm circuit (field supply) must be connected to the SVS output of the
BS unit, see
"16.5 To connect the external outputs"
88].
This alarm system must warn audibly AND visibly (e.g. a loud buzzer AND a flashing
light). The audible alarm must be 15 dBA above the background sound level at all
times.
At least 1 alarm must be installed in the occupied space in which the BS unit is
installed.
For the occupancy listed below, the alarm system must
additionally
warn at a
supervised location with 24-hour monitoring:
-
with sleeping facilities.
-
where an uncontrolled number of people are present.
-
accessible for persons not familiar with the necessary safety precautions.
To warn at a supervised location, connect a supervisor remote controller to the
system. This supervisor remote controller can be connected to any indoor unit of
the system, and will warn at the supervised location in case a refrigerant leak is
detected in any BS unit of the system.
Note:
An address number for the supervisor
remote controller must be assigned to the BS unit. See
When the R32 sensor in the BS unit detects a refrigerant leak, the SVS output will
close and activates the alarm. An error message will display on the remote
controllers of the connected indoor units. See
107].
BS unit test run
Before BS unit operation, it is required to perform a test run that simulates a
refrigerant leak. See
Field settings
External alarm
Code
Description
Value
[2-0]
Cluster indication
0 (default): disable
[2-4]
Safety measures
1 (default): enable
[2-7]
Ventilated enclosure
0: disable
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
13.4.3 Ventilated enclosure
A ventilated enclosure is required as a safety measure in case the other safety
measures (see
45] and
For the ventilated enclosure safety measure, ductwork and an extraction fan have
to be installed. See
"14.5 Installing the ventilation ducting"
65] for ductwork
(field supply) installation and
"16.5 To connect the external outputs"
88] to
connect the extraction fan circuit (field supply) to the BS unit.
