16
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Special requirements for R32 units
Installer and user reference guide
61
REMA5+REYA8~20A7Y1B
VRV 5 heat recovery
4P687640-1 – 2022.07
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
"16.4 To determine the charge limit"
64] 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
80]. 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
"18.3 Checking the refrigerant piping"
Remote controller requirements
INFORMATION
The following figure is an example and may NOT completely match your system
layout
a
c
d
f
h
e
d
c
c
d
g
h
h
b
a
Heat recovery outdoor unit
b
Branch selector (BS)
c
VRV direct expansion (DX) indoor unit
d
Remote controller in
normal mode
e
Remote controller in
alarm only mode
f
Remote controller in
supervisor mode
(mandatory in some situations)
g
iTM (optional)
h
Option PCB (optional)
Refrigerant piping
Transmission and user interface wiring
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 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.
