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Troubleshooting
Installer and user reference guide
168
REMA5+REYA8~20A7Y1B
VRV 5 heat recovery
4P687640-1 – 2022.07
f
Remote controller in alarm only mode
g
Remote controller in supervisor mode (mandatory in some situations)
h
iTM (optional)
Note:
During start-up of the system, the mode of the remote control can be
verified from the screen.
Leak detection operation
1
If the R32 sensor in the indoor unit detects a refrigerant leak:
-
The user will be warned by both audible and visible signals of the remote
controller of the leaking indoor unit (and the supervisor remote controller, if
applicable).
-
At the same time the BS unit will close the shut-off valves of the corresponding
branch pipe in order to reduce the amount of refrigerant in the indoor system.
-
After the operation, the indoor units of the port where the leak was detected
will be out of operation and display an error. The rest of the system will
continue operation.
2
If the R32 sensor in the BS unit detects a refrigerant leak:
-
The BS unit will close all of its shut-off valves and triggers the ventilation
system (if equipped) of the BS unit to evacuate the leaking refrigerant.
-
After the operation, the system will go in locked state and the remote
controllers will display an error. Service is needed to repair the leak and
activate the system. Refer to the service manual for more information.
Feedback of the remote controller after leak detection operation will depend on its
mode.
WARNING
The unit is equipped with a refrigerant leak detection system for safety.
To be effective, the unit MUST be electrically powered at all times after installation,
except for maintenance.
c
i
a
d
e
f
d
c
c
d
d
g
k
m
j
h
b
l
l
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
Refrigerant leak
j
Outdoor unit error code on 7‑segment display
k
Error code 'A0–11' and audible alarm and red warning signal is generated from this
remote controller.
l
Error code 'U9–02' is displayed on this remote controller. No alarm or warning
lights.
m
Error code 'A0–11' and audible alarm and red warning signal is generated from this
supervisor
remote controller. The unit
address
is displayed on this remote
controller.
