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English
INFORMATION
Note that during the first running period of the unit, required power in
-
put may be higher. This phenomenon originates from the compressor
that requires a 50 hour run elapse before reaching smooth operation
and stable power consumption. Reason is that the scroll is made out
of iron and that it takes some time to smooth the surfaces that make
contact.
NOTE
To protect the compressor, be sure to turn on the power supply 6
hours before starting operation.
15.4.2. Test operation
The procedure below describes the test operation of the complete
system. This operation checks and judges following items:
•
Check of wrong wiring (communication check with indoor units).
•
Check of the stop valves opening.
•
Judgment of piping length.
On top of this system test operation, Branch Selector units and indoor
units operation should also be checked separately.
•
Make sure to carry out the system test operation after the first
installation. Otherwise, the malfunction code U3 will be displayed on
the user interface and normal operation or individual Branch Selec
-
tor unit and indoor unit test run cannot be carried out.
•
Abnormalities on Branch Selector units and indoor units cannot be
checked for each unit separately. After the test operation is finished,
check the Branch Selector units and the indoor units one by one by
performing a normal operation using the user interface. Refer to the
Branch Selector units and the indoor units installation manual for
more details 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 mag
-
netic sound of a solenoid valve may become loud and the display
indication may change.
These are not malfunctions.
Procedure
1
Close all front panels in order to not let it be the cause of misjudg
-
ment.
2
Make sure all field settings you want are set; see 15.2. Monitoring
function and field settings on page 32.
For a complete list of indoor and outdoor unit field settings, refer to
the online service manual of this outdoor unit.
3
Turn ON the power to the outdoor units, the connected Branch
Selector units and the connected indoor units.
NOTE
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 13.2. Operat
-
ing the push buttons and DIP switches on the printed circuit board
on page 25. Push BS2 for 5 seconds or more. The unit will start test
operation.
•
The test operation is automatically carried out, the outdoor unit
display will indicate
01
and the indication
Test operation
and
Under centralized control
will display on the user interface of
indoor units.
Steps during the automatic system test run procedure:
-
01
: control before start up (pressure equalization)
-
02
: cooling start up control
-
03
: cooling stable condition
-
04
: communication check
-
05
: stop valve check
-
06
: pipe length check
-
07
: refrigerant amount check
-
08
: detailed refrigerant situation check
-
09
: pump down operation
-
10
: unit stop
•
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 segment
display.
-
Normal completion: no indication on the segment display
(idle).
-
Abnormal completion: indication of malfunction code on the
segment display.
Refer to 15.4.3. Correcting after abnormal completion of the
test operation to take actions for correcting the abnormality.
When the test operation is fully completed, normal operation
will be possible after 5 minutes.
15.4.3. Correcting after abnormal completion of the test
operation
The test operation is only completed if there is no malfunction code
displayed on the user interface or outdoor unit segment display. In
case a malfunction code is displayed, 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 other detailed
malfunction codes related to indoor units.
15.5. Malfunction code list
In case of a displayed malfunction code, perform correcting actions as
explained in the malfunction code table.
After correcting the abnormality, press BS3 to reset the malfunction
code and retry operation.
The malfunction code which is displayed on the outdoor unit will indi
-
cate a main malfunction code and a sub code. The sub code indicates
more detailed information about the malfunction code. The malfunc
-
tion code will be displayed intermittent.
Example:
Main code
Sub code
With an interval of 1 second, the display will switch between main
code and sub code.
01_EN_03_3P734038-2.indd 40
01_EN_03_3P734038-2.indd 40
2023/08/22 17:17:49
2023/08/22 17:17:49
