Daikin Inverter Wall Mounted Single Split FTKB24AXVJU

Warning: Ensure the voltage between the terminal of Power transistor (+) and (-) is approx. 0 volt before proceeding

Voltage between the terminal of Power transistor (+) and (-) is approx. 0 volt

Disconnect the compressor harness connector from the outdoor unit PCB. To disengage the connector, press the protrusion on the connector.

Measure resistance between power transistor (+) and (-) and the U terminal of the compressor connector

Measure resistance between power transistor (+) and (-) and the V terminal of the compressor connector

Measure resistance between power transistor (+) and (-) and the W terminal of the compressor connector

Evaluate the measurement results for a pass/fail judgment

Sign off on the power transistor check

Warning: This check requires trained personnel with PPE!

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

Upload the oscilloscope screenshot of the waveform

Is the power supply waveform a sine wave (Refer to Fig. 1)?

Is there waveform disturbance near the zero cross (sections circled in Fig. 2)?

Sign off on the power supply waveforms check

EXV connector correctly connected to PCB

EXV generates a latching sound after power cycle

EXV generates a latching sound after disconnecting and checking continuity with a multimeter

Check the continuity between pins

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

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

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