13 Special requirements for R32 units
Installation and operation manual
21
REMA5+REYA8~20A7Y1B
VRV 5 heat recovery
4P684060-1 – 2022.02
12.2
System layout
WARNING
The installation MUST comply with the requirements that
apply to this R32 equipment. For more information, see
"13 Special requirements for R32 units"
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)
13
Special requirements for R32
units
13.1
Installation space requirements
WARNING
If the appliance contains R32 refrigerant, the floor area of
the room in which the appliance is stored shall be at least
956 m².
NOTICE
▪ Pipework shall be protected from physical damage.
▪ Installation of pipework shall be kept to a minimum.
13.2
System layout requirements
The VRV 5 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 BS
unit is prearranged for a ventilated enclosure as countermeasure. In
case the requirements of this manual are followed, no additional
safety measures are needed.
A big range of charge and room area combinations is allowed thanks
to the countermeasures that are implemented in the system by
default.
Follow the installation requirements below to ensure that the
complete system is compliant to legislation.
Outdoor unit installation
The outdoor unit has to be installed outside. For indoor installation of
the outdoor unit, additional measures can be necessary to comply
with the applicable legislation.
A terminal for external output is available in the outdoor unit. This
SVS output can be used when additional countermeasures are
needed. The SVS output is a contact on terminal X2M that closes in
case a leak is detected, failure or disconnection of an R32 sensor
(located in the indoor unit or BS unit).
For more information about the SVS
output, see
42].
Indoor unit installation
For installation of the indoor unit, refer to the installation and
operation manual delivered with the indoor unit. For compatibility of
indoor units refer to the latest version of the technical data book of
this unit.
The total amount of refrigerant in the system shall be less than or
equal to the maximum allowed total refrigerant amount. The
maximum allowed total refrigerant amount depends on the area of
the rooms being served by the system and the rooms in the lowest
underground floor.
See
"13.4 To determine the charge limit"
23] to check if your
system meets the requirement for charge limitation.
An optional output PCB for the indoor unit can be added to provide
output for external device. The output PCB will trigger in case a leak
is detected, the R32 sensor fails or when the sensor is disconnected.
For exact model name see option list of the indoor unit. For more
information about this option, refer to the installation manual of the
optional output PCB.
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: alarm or ventilated enclosure.
For more information refer to the installation manual delivered with
the BS unit.
Piping requirements
Piping must be installed according to instructions given in
28]. Only mechanical joints (e.g. braze+flare
connections) that are compliant with the latest version of ISO14903
can be used.
For piping installed in the occupied space, please make sure that the
piping is protected against accidental damage. Piping should be
checked according to procedure as mentioned in
Remote controller requirements
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)
For installation of the remote controller, please refer to the
installation and operation manual delivered with the remote
controller. Each indoor unit has to be connected with a R32 safety
