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16. Operation of the unit
Once the units are installed and test operation of outdoor units and
indoor units are finished, the operation of the system can start.
For operating the indoor units, the user interface of the indoor units
should be switched ON. Refer to the indoor unit operation manual for
more details.
17. Maintenance and service
17.1.
Maintenance introduction
In order to ensure optimal operation of the unit, a number of checks
and inspections should be carried out on the unit at regular intervals,
preferably yearly.
This maintenance shall be carried out by the installer or service agent.
Please refer to the Maintenance and service check list available on Dai-
kin City or contact your Daikin representative for the latest document.
17.2. Service precautions
DANGER: DO NOT TOUCH PIPING AND INTERNAL PARTS
See Safety considerations on page i.
CAUTION
When performing service to inverter equipment:
1 Make sure to turn off the power supply before opening the control
box cover.
• Do not open the control box cover for 10 minutes after the power
supply is turned off.
How to open the control box cover:
5x
2 Measure the voltage between terminals on the terminal block
for power supply with a tester and confirm that the power supply
is turned off. In addition, measure points as shown in the figure
below, with a tester and confirm that the voltage of the capacitor in
the main circuit is less than 50 V DC.
RXYQ72A type
2
+
-
English
3
+
-
1
RXYQ96-240A type
2
+
-
1 Terminal block for power supply
2 Tester
3 White connector
3 To prevent damaging the printed circuit board, touch a noncoated
metal part to eliminate static electricity before pulling out or plug-
ging in connectors.
4 Pull out junction connectors X1A, X2A for the fan motors in the
outdoor unit before starting service operation on the inverter equip-
ment. Be careful not to touch the live parts.
(If a fan rotates due to strong wind, it may store electricity in the
capacitor or in the main circuit and cause electric shock.)
5 After the service is finished, plug the junction connector back in.
Otherwise the error code E7 will be displayed on the user interface
or on the outdoor unit segment display and normal operation will
not be performed.
For details refer to the wiring diagram labelled on the back of the
control box cover.
Pay attention to the fan. It is dangerous to inspect the unit while the
fan is running. Make sure to turn off the main switch and to remove the
fuses from the control circuit located in the outdoor unit.
NOTE
Play it safe. For protection of the printed circuit board, touch the con-
trol box casing by hand in order to eliminate static electricity from your
body before performing service.
17.3. Service mode operation
Refrigerant recovery operation/vacuuming operation is possible by
applying setting [2-21]. Refer to 13.2. Operating the push buttons and
DIP switches on the printed circuit board on page 28 for details how
to set mode 2.
When vacuuming/recovery mode is used, check very carefully what
should be vacuumed/recovered before starting. See installation manual
of the indoor unit for more information about vacuuming and recovery.
3
+
-
1
*The figure is RXYQ240A type.
48
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