17 Commissioning
Installation and operation manual
37
RK RKXYQ8T7Y1B
VRV IV compressor unit for indoor installation
4P499900-1B – 2021.12
Drainage
Make sure drainage flows smoothly.
Possible consequence:
Condensate water might drip.
External static pressure
Make sure the external static pressure is set.
Possible consequence:
Insufficient cooling or heating.
17.3
Checklist during commissioning
To perform a
test run
.
17.3.1
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 of wrong wiring (communication check with indoor units
and heat exchanger unit).
▪ Check of the stop valves opening.
▪ Check of wrong piping.
Example:
Gas or liquid pipes switched.
▪ Judgement of piping length.
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
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.
17.3.2
To perform a test run (7-LEDs display)
(in case of 5 HP)
1
Make sure all field settings you want are set; see
29].
2
Turn ON the power to the compressor unit, heat exchanger 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.
3
Make sure the default (idle) situation is existing (H1P is OFF);
see
"16.1.4 To access mode 1 or 2"
30]. Push BS4 for 5
seconds or more. The unit will start test operation.
Result:
The test operation is automatically carried out, the
compressor unit H2P flashes 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
Pump down operation
Unit stop
INFORMATION
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.
4
Check the test operation results on the compressor unit 7‑LEDs
display.
Completion
Description
Normal
completion
Abnormal
completion
"17.3.4 Correcting after abnormal
38] to take
actions for correcting the abnormality. When
the test operation is fully completed, normal
operation will be possible after 5 minutes.
17.3.3
To perform a test run (7-segment display)
(in case of 8 HP)
1
Make sure all field settings you want are set; see
2
Turn ON the power to the compressor unit, heat exchanger 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.
3
Make sure the default (idle) situation is existing; see
30]. Push BS2 for 5 seconds or more.
The unit will start test operation.
Result:
The test operation is automatically carried out, the
compressor 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
Pump down operation
Unit stop
INFORMATION
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.
