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9 Maintenance and service
Installer and user reference guide
41
RXYTQ8~16U7YF
VRV IV+ heat pump for high ambient temperatures
4P561157-1 – 2018.09
8.4
About the test run
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.
▪ Make sure to carry out the system test operation 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.
▪ 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.
8.5
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
access mode 1 or 2" on page 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.
Refer to
"8.6 Correcting after abnormal
completion of the test run" on page 41
to take
actions for correcting the abnormality. When
the test operation is fully completed, normal
operation will be possible after 5 minutes.
8.6
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.
8.7
Operating the unit
Once the unit is installed and test operation of outdoor unit and
indoor units is finished, the operation of the system can start.
For operating the indoor unit, the user interface of the indoor unit
should be switched ON. Refer to the indoor unit operation manual for
more details.
9
Maintenance and service
NOTICE
Maintenance MUST be done by an authorized installer or
service agent.
We recommend performing maintenance at least once a
year. However, applicable legislation might require shorter
maintenance intervals.
NOTICE
In Europe, the
greenhouse gas emissions
of the total
refrigerant charge in the system (expressed as tonnes CO
2
equivalent) is used to determine the maintenance intervals.
Follow the applicable legislation.
Formula to calculate the greenhouse gas emissions:
GWP value of the refrigerant × Total refrigerant charge [in
kg] / 1000
9.1
Overview: Maintenance and
service
This chapter contains information about:
▪ Preventing electrical hazards when maintaining and servicing the
system
▪ The refrigerant recovery operation
9.2
Maintenance safety precautions
DANGER: RISK OF ELECTROCUTION
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