18
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Commissioning
Installer and user reference guide
69
FXSN50~112A2VEB
CO₂ Conveni-Pack: indoor unit
4P602817-1A – 2020.05
18.3 To perform a test run
INFORMATION
Test run is carried out on the outdoor unit side. For the test run procedure, see the
reference guide of the outdoor unit. If necessary, also see the reference guide of the
user interface.
NOTICE
Do NOT interrupt the test run.
18.4 Error codes when performing a test run
If the installation of the outdoor unit has NOT been done correctly, the following
error codes may be displayed on the user interface:
INFORMATION
To display error codes, refer to the reference guide of the user interface.
Error code
Possible cause
Nothing displayed
(the currently set
temperature is not
displayed)
▪
The wiring is disconnected or there is a wiring
error (between power supply and outdoor unit,
between outdoor unit and indoor units, between
indoor unit and user interface).
▪
The fuse on the outdoor or indoor unit PCB has
blown.
E3, E4
▪
The stop valves are closed.
▪
The air inlet or air outlet is blocked.
EF
Abnormality of the refrigeration capacity booster
(Qup) unit.
F4
Defective expansion valve control refrigerator
L4
The air inlet or air outlet is blocked.
U4 or UF
The inter-unit branch wiring is not correct.
UA
The outdoor and indoor unit are incompatible.