18 Troubleshooting
Installation and operation manual
36
RWEYQ8~14T9Y1B
VRV IV water-cooled system air conditioner
4P452190-1D – 2020.10
Additional refrigerant charge
The amount of refrigerant to be added to the unit shall be
written on the included "Added refrigerant" plate and
attached to the rear side of the front cover.
Installation date and field setting
Be sure to keep record of the installation date on the
sticker on the rear of the upper front panel according to
EN60335‑2‑40 and keep record of the contents of the field
setting(s).
Inspect the
water filter
at the inlet piping of the outdoor
unit. Clean if it is dirty.
The
piping work
has been carried out according to this
document and the applicable legislation. Make sure that
following components are positioned at their correct
places:
▪ water filter,
▪ air purge valve,
▪ automatic water supply valve, and
▪ expansion tank.
Water circuit
Make sure that the water circuit is filled.
Water flow
Make sure that the calculated water flow rate can be
reached.
17.3
About the test run
NOTICE
Make sure to carry out the test run after the first
installation. Otherwise, the malfunction code
will be
displayed on the user interface and normal operation or
individual indoor unit test run cannot be carried out.
The procedure below describes the test operation of the complete
system. This operation checks and judges following items:
▪ Check for incorrect wiring (communication check with indoor
units).
▪ Check of the stop valves opening.
▪ Judgement of piping length.
In case Hydrobox units are present in the system, the pipe length
check and the refrigerant situation check will not be performed.
▪ Abnormalities on indoor units cannot be checked for each unit
separately. After the test operation is finished, check the indoor
units one by one by performing a normal operation using the user
interface. Refer to the indoor unit installation manual for more
details (e.g., Hydrobox) concerning the individual test run.
INFORMATION
▪ It may take 10 minutes to achieve a uniform refrigerant
state before the compressor starts.
▪ During the test operation, the refrigerant running sound
or the magnetic sound of a solenoid valve may become
loud and the display indication may change. These are
not malfunctions.
17.4
To perform a test run
1
Close all front panels in order to not let it be the cause of
misjudgement (except the electrical component box inspection
opening service cover).
2
Make sure all field settings you want are set; see
3
Turn ON the power to the outdoor unit and the connected
indoor units.
NOTICE
Be sure to turn ON the power 6 hours before operation in
order to have power running to the crankcase heater and
to protect the compressor.
4
Make sure the default (idle) situation is existing; see
33]. Push BS2 for 5 seconds or more.
The unit will start test operation.
Result:
The test operation is automatically carried out, the
outdoor unit display will indicate "
" and the indication "Test
operation" and "Under centralised control" will display on the
user interface of indoor units.
Steps during the automatic system test run procedure:
Step
Description
Control before start up (pressure equalisation)
Cooling start up control
Cooling stable condition
Communication check
Stop valve check
Pipe length check
Refrigerant amount check
Pump down operation
Unit stop
Note:
During the test operation, it is not possible to stop the unit
operation from a user interface. To abort the operation, press BS3.
The unit will stop after ±30 seconds.
5
Check the test operation results on the outdoor unit 7‑segment
display.
Completion
Description
Normal completion No indication on the 7‑segment display (idle).
Abnormal
completion
Indication of malfunction code on the
7‑segment display.
"17.5 Correcting after abnormal
actions for correcting the abnormality. When
the test operation is fully completed, normal
operation will be possible after 5 minutes.
17.5
Correcting after abnormal
completion of the test run
The test operation is only completed if there is no malfunction code
displayed on the user interface or outdoor unit 7‑segment display. In
case of a displayed malfunction code, perform correcting actions as
explained in the malfunction code table. Carry out the test operation
again and confirm that the abnormality is properly corrected.
INFORMATION
Refer to the installation manual of the indoor unit for
detailed malfunction codes related to indoor units.
18
Troubleshooting
18.1
Solving problems based on error
codes
In case of a displayed malfunction code, perform correcting actions
as explained in the malfunction code table.
