21 Troubleshooting
Installation and operation manual
52
REMA5+REYA8~20A7Y1B
VRV 5 heat recovery
4P684060-1 – 2022.02
Main
code
Sub code
Cause
Solution
SVEO
(a)
SVS
(b)
Master
Slave 1
Mismatch between wiring path and piping
path during test run
Mistake detected during BS unit and indoor
unit connection check. Confirm wiring
between indoors and BS units.
Refer to BS unit manual for more
information.
Auto address malfunction (inconsistency)
Check if transmission wired unit amount
matches with powered unit amount (by
monitor mode) or wait till initialisation is
finished.
Maintenance warning (ventilation fan)
BS unit ventilation needs maintenance
check. Refer to the BS unit manual for more
information.
Leak detection function related error codes
—
Unit is not prepared to execute leak
detection operation
Refer to requirements to be able to execute
leak detection operation.
—
Indoor unit is out of temperature range for
leak detection operation
Retry when ambient conditions are
satisfied.
—
Outdoor unit is out of temperature range for
leak detection operation
Retry when ambient conditions are
satisfied.
—
Too low pressure was noticed during leak
detection operation
Restart leak detection operation.
—
Indicates an indoor unit which is not
compatible with leak detection functionality is
installed
Use VRV R32 compatible indoor units, see
engineering databook for unit selection.
(a)
The SVEO terminal provides an electrical contact that closes in case the indicated error occurs.
(b)
The SVS terminal provides an electrical contact that closes in case the indicated error occurs.
(c)
The error code is only shown on the user interface of the indoor unit where the error occurs.
21.2
Refrigerant leak detection system
Normal operation
During normal operation, the alarm only and supervisor remote
controller have no functionality. The screen of the remote controller
in alarm only and supervisor mode will be off. Operation of the
remote controller can be checked by pushing the
button to open
the installer menu.
c
a
d
e
f
d
c
c
d
e
g
h
b
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)
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.
