13 Special Requirements For R32 Units; Installation Space Requirements; System Layout Requirements - Daikin VRV 5-S RXYSA8AMY1B Installation And Operation Manual

c VRV direct expansion (DX) indoor unit
d VRV direct expansion (DX) indoor unit (direct connection
from outdoor to indoor)
e Remote controller in normal mode
f Remote controller in alarm only mode
g Remote controller in supervisor mode (mandatory in
some situations)
h Centralised controller (optional)
i Option PCB (optional)
j Cool/heat changeover remote control switch (optional)
Refrigerant piping
Interconnection and user interface wiring
Direct connection of indoor units to the outdoor unit
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
429 m².
NOTICE
▪ The pipework shall be securely mounted and guarded
protected from physical damage.
▪ Keep the pipework installation to a minimum.
13.2

System layout requirements

The VRV 5-S 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 an
alarm in the remote controller and shut-off valves in the SV unit.
Both safety measures are installation specific and can be
determined using the requirements mentioned in this manual. The
SV unit is prearranged
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 must 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 SV unit).
For more information about the SVS output, see
outputs" [ 4 39].
the external
Indoor unit installation
NOTICE
If one or more rooms are connected to the unit using a
duct system, make sure air inlet AND outlet are connected
directly to the same room by ducting. Do NOT use spaces
such as a false ceiling as a duct for the air inlet or outlet.
RXYSA8~12AMY1B
VRV 5-S system air conditioner
4P752781-1B – 2024.02
for a ventilated enclosure
"17.5 To connect

13 Special requirements for R32 units

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.
Depending on the room size in which the indoor unit is installed and
the total amount of refrigerant in the system, other safety measures
are necessary for indoor units. See
measures" [ 4 20].
safety
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.
Piping requirements
CAUTION
Piping MUST be installed according to instructions given in
installation" [ 4 28]. Only mechanical joints (e.g.
"15 Piping
braze+flare connections) that are compliant with the latest
version of ISO14903 can be used.
Low temperature solder alloys shall not be used for pipe
connections.
For piping installed in the occupied space, make sure that the piping
is protected against accidental damage. Piping should be checked
according to the procedure as mentioned in
piping" [ 4 33].
refrigerant
Remote controller requirements
For installation of the remote controller, please refer to the
installation and operation manual delivered with the remote
controller. Each indoor unit must be connected with a R32 safety
system compatible remote controller (e.g. BRC1H52/82* or later
type). These remote controllers have implemented safety measures
that will warn the user visually and audibly in case of a leak.
For installation of the remote controller, it is mandatory to follow the
requirements.
1 Only a safety system compatible remote controller can be used.
as
See technical data sheet for remote controller compatibility (e.g.
BRC1H52/82*).
2 Each indoor unit must be connected to a separate remote
controller. In case indoor units are operating under group
control, it is possible to only use one remote controller per
room.
Examples
1 Remote controller is not R32 safety system compatible.
a b
c
d
2 Indoor units without remote controller are not allowed.
a b
c c
a Outdoor unit
b SV unit
c Indoor unit
d Remote controller NOT compatible with R32 safety
system
e Remote controller compatible with R32 safety system
NOT allowed
Allowed
"13.3 To determine the required
"15.3 Checking the
a b
c
e
a b
c c c
e
e
Installation and operation manual
c
e e
19