23
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Maintenance and service
Installer and user reference guide
120
RXYSQ4~6T8V/YB
VRV IV-S system air conditioner
4P482277-1B – 2020.10
A1P
C–
C+
V
Y
C–
C+
A2P
A1P
3
To prevent damaging the PCB, touch a non-coated metal part to eliminate
static electricity before pulling out or plugging in connectors.
4
Pull out junction connectors 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 electric shock.)
Junction connectors
X106A for M1F
X107A for M2F
5
After the service is finished, plug the junction connector back in. Otherwise
the malfunction code
will be displayed and normal operation will not be
performed.
For details refer to the wiring diagram labelled on the back of the 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.
23.2 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.
23.3 About service mode operation
Refrigerant recovery operation/vacuuming operation is possible by applying setting
[2‑21]. Refer to
99] 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.