Daikin Air Conditioner RXYQ168TAYDU

Set the unit in [2-21]=1 when the unit is at standstill

Confirm the indoor and outdoor unit expansion valves are fully open

Evacuate the system with a vacuum pump

Press BS3 to stop vacuuming mode

Check maximum concentration level of refrigerant

Calculate the amount of refrigerant (lbs. (kg)) charged to each system separately

Follow local code requirements (ASHRAE-15 2007 & ASHRAE-34 2007)

DANGER: Do not touch piping and internal parts

Do not open the control box cover for 10 minutes after the power supply is turned off

Measure the voltage between terminals on the terminal block for power supply

Confirm that the power supply is turned off

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

To prevent damaging the printed circuit board, touch a noncoated metal part to eliminate static electricity before pulling out or plugging in connectors

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.)

After the service is finished, 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 operation will not be performed

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;