Daikin Cooling-Only Outdoor Unit RKB09AXVJU

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

If fuse is melted, check the outdoor fan motor for proper function.

Is the EXV connector correctly connected to PCB?

Does EXV generate a latching sound when power is turned off and on again?

If EXV does not generate a latching sound, proceed to next step

Is there continuity when connector is disconnected and checked using a multimeter?

Check the continuity between pins

If there is no continuity between the pins, EXV coil is faulty

Is there continuity confirmed in previous step?

If the continuity is confirmed, outdoor PCB is faulty

Sign off on the Electronic Expansion Valve Check

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

Enter the resistance between the pins of the DB1

Is the resistance ∞ or less than 1 kW?

If the resistance is ∞ or less than 1 kW, a short circuit occurs on the main circuit.

Sign off on the main circuit short check

Warning: This check 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

Is the power supply waveform a sine wave?

Is there waveform disturbance near the zero cross?

Sign off on the power supply waveforms check

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