12 Special requirements for R32 units
Installation and operation manual
14
BS4~12A14AJV1B
VRV 5 branch selector unit
4P670163-1 – 2022.02
11.2.1
Identification label: BS unit
Location
11.3
About the operation range
INFORMATION
For the operation limits, see
20].
11.4
System layout
WARNING
The installation MUST comply with the requirements that
apply to this R32 equipment. For more information, see
"12 Special requirements for R32 units"
14].
INFORMATION
The following figure is an example and may NOT
completely match your system layout
c
b
a
d
e
g
i
f
e
d
c
c
d
e
h
i
i
a
Heat recovery outdoor unit
b
Branch selector (BS)
c
Refrigerant piping
d
VRV direct expansion (DX) indoor unit
e
Remote controller in normal mode
f
Remote controller in
alarm only mode
g
Remote controller in
supervisor mode
(mandatory in
some situations)
h
iTM (optional)
i
Option PCB (optional)
12
Special requirements for R32
units
12.1
Installation space requirements
NOTICE
▪ Pipework shall be protected from physical damage.
▪ Installation of pipework shall be kept to a minimum.
12.2
System layout requirements
The VRV 5 Heat Recovery uses R32 refrigerant which is rated as
A2L and is mildly flammable.
To comply with the requirements of enhanced tightness refrigerating
systems of the IEC 60335-2-40, this system is equipped with shut-off
valves in the BS unit and an alarm in the remote controller.
The safety measures that are needed for the BS unit are explained
in more detail below. If they are followed, no additional safety
measures for the BS unit are required. Follow the installation
requirements for the BS unit as explained in this manual carefully
and follow the installation requirements described in the outdoor unit
and indoor unit installation and operation manuals to ensure that the
complete system is compliant to legislation.
Outdoor unit installation
For installation of the outdoor unit, see the installation and operation
manual delivered with the outdoor unit.
Indoor unit installation
Room area limitations apply for the indoor units, details are
explained in the installation and operation manual delivered with the
outdoor unit. For installation of the indoor unit, see the installation
and operation manual delivered with the indoor unit. For
compatibility of indoor units, see the latest version of the technical
data book of the outdoor unit.
Remote controller requirements
For installation of the remote controller, see the installation and
operation manual delivered with the remote controller. For
requirements of where and how to use a remote controller and which
type to use, see the installation and operation manual delivered with
the outdoor unit.
BS unit installation
Depending on the room size in which the BS unit is installed and the
total amount of refrigerant in the system, different safety measures
can be applied. See
"12.3 To determine the required safety
14]. For the total amount of refrigerant in the system,
see the installation and operation manual delivered with the outdoor
unit.
A terminal for external output is available in the BS unit. This SVS
output can be used when additional countermeasures are needed,
or when the BS unit is installed in a room size where an external
alarm is a sufficient safety measure. The SVS output is a potential
free contact on terminal X6M that closes in case a refrigerant leak is
detected, failure or disconnection of the R32 sensor of the BS unit
occurs.
For more information about the SVS output, see
Piping requirements
Piping must be installed according to instructions given in
28]. Only mechanical joints (e.g. braze connections)
that are compliant with the latest version of ISO14903 can be used.
For piping installed in the occupied space, make sure that the piping
is protected against accidental damage. Piping should be checked
according to procedure as mentioned in the installation and
operation manual delivered with the outdoor unit.
12.3
To determine the required safety
measures
Step 1
– Determine the total amount of refrigerant in the system.
See the installation and operation manual delivered with the outdoor
unit.
Step 2
– Determine the area of the room in which the BS unit is
installed:
The room area can be determined by projecting the walls, doors and
partitions to the floor and calculating the enclosed area.
Spaces connected by only false ceilings, ductwork, or similar
connections shall not be considered a single space.
