Daikin RXYQ168TYDN - 16 Operation of the Unit; 17 Maintenance and Service; Maintenance Introduction; Service Precautions

423P362438-1B English
Malfunction code
Contents Solution
Main code
Auto charging related
P2
Unusual low pressure on suction line Close valve A immediately. Push BS3 to reset. Check
following items before retrying autocharge procedure:
• Check if the gas side stop valve is opened correctly.
• Check if the valve of the refrigerant cylinder is
opened.
• Check if the air inlet and outlet of the indoor unit are
not obstructed.
P8
Freeze-up prevention indoor unit Close valve A immediately. Push BS3 to reset. Retry
autocharge procedure.
PE
Automatic charging nearly nished Prepare for autocharge stopping.
P9
Automatic charging nished Finish autocharge mode.
16. Operation of the unit
Once the unit is installed and test operation of outdoor unit and indoor
units is nished, 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.
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.
17.2. Service precautions
DANGER: DO NOT TOUCH PIPING AND ITERNAL PARTS
See Safety considerations on pagei.
CAUTION
When performing service to inverter equipment:
1 Do not open the control box cover for 10 minutes after the power
supply is turned off.
2 Measure the voltage between terminals on the terminal block for
power supply with a tester and conrm that the power supply is
turn off. In addition, measure points as shown in the gure below,
with a tester and conrm that the voltage of the capacitor in the
main circuit is less than 50 V DC.
1
2
3
RXYQ72T
RXYQ96,120T
RXYQ144,168T
2
3
1
2
2
3
3
1
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 (X3A, X4A) 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.)
5 After the service is nished, plug the junction connector back in.
Otherwise the malfunction code E7 will be displayed on the user
interface or on the outdoor unit segment display and normal opera-
tion 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.