Daikin Cooling-Only Outdoor Unit RKN12AXVJU

In order to protect the environment, be sure to conduct pump down operation when relocating or disposing of the unit.

Remove the valve caps from the liquid stop valve and the gas stop valve.

Carry out forced cooling operation.

Close the liquid stop valve with a hexagonal wrench.

Close the gas stop valve and stop the forced cooling operation.

Sign off on the pump down maintenance

Warning: This procedure requires trained personnel with PPE!

Measure the power supply waveform between No. 1(Live) and No. 2(Neutral) on the terminal board

Upload the oscilloscope reading of the waveform

Is the power supply waveform a sine wave?

Is there waveform disturbance near the zero cross?

Sign off on the power supply waveforms check

Set operation off and power off. Disconnect the connector S71.

Control voltage between the pins 3 & 4

Rotation command voltage between the pins 2 & 4

Keep operation off and power off. Connect the connector S71.

Pulses output at the pins 1 - 4 when the fan motor is rotated 1 turn by hand

Outdoor fan motor functioning properly?

Warning: Ensure the voltage between (+) and (-) of the diode bridge (DB1) is approximately 0 V before checking.

Enter the resistance between the pins of the DB1

If the resistance is ∞ or less than 1 kW, check the corresponding box

Remark: Use opposite sign of terminal for digital multimeter for measurement.

Sign off on the main circuit short check

EXV connector correctly connected to PCB

EXV generates a latching sound after power cycle

EXV generates a latching sound after disconnecting and reconnecting connector

Continuity between pins 1-6 for harness 5P models

Continuity between pins 2-6 for harness 5P models