Daikin VRV 5-S - Checklist for Yearly Maintenance of the Outdoor Unit; About Service Mode Operation

24 | Maintenance and service
Installer and user reference guide
156
RXYSA8~12AMY1B
VRV 5-S system air conditioner
4P752782-1A – 2024.02
2 Measure the voltage between terminals on the terminal block for power
supply with a tester and confirm that the power supply is shut off. In addition,
measure points as shown in the figure, with a tester and confirm that the
voltage of the capacitor in the main circuit is less than 50VDC. If the voltage
measured is still higher than 50 V DC, discharge the capacitors in a safe
manner by using a dedicated capacitor discharge pen to avoid possibility of
sparking.
8 HP 10-12 HP
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3 Pull out junction connectors X1A, X2A for the fan motors in the outdoor unit
before starting service operation on the inverter equipment. 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 electrical shock.)
4 After the service is finished, plug the junction connector back in. Otherwise
the malfunction code will be displayed on the user interface or on the
outdoor unit 7‑segment display and normal operation will NOT be performed.
For details refer to the wiring diagram labelled on the back of the switch box/
service 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.
24.2 Checklist for yearly maintenance of the outdoor unit
Check the following at least once a year:
▪ Heat exchanger
The heat exchanger of the outdoor unit can get blocked up due to dust, dirt,
leaves, etc. It is recommended to clean the heat exchanger yearly. A blocked
heat exchanger can lead to too low pressure or too high pressure leading to
worse performance.
24.3 About service mode operation
Refrigerant recovery operation/vacuuming operation is possible by applying setting
[2‑21]. Refer to "21.1Making field settings"[4129] 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.