Daikin Outdoor Heat Pump RX60G4V1B

Warning: This procedure requires trained personnel with PPE!

Install an inverter analyzer instead of a compressor

Charged voltage of the built-in smoothing electrolytic capacitor dropped to 10 VDC or below?

Terminals removed from the compressor?

Terminals connected to the terminals of the inverter analyzer without touching each other?

Activate the power transistor test operation from the outdoor unit

Forced cooling operation ON/OFF button pressed for 5 seconds?

Diagnose according to 6 LEDs lighting status

Warning: Ensure the machine is powered off before starting the procedure

Disconnect the connectors of the thermistors from the PCB

Measure the resistance of each thermistor using a multimeter

Remove the PCB from the control PCB to measure the resistance if the room temperature thermistor is soldered on a PCB

Remove the thermistor and measure the resistance if the connector of indoor heat exchanger thermistor is soldered on a PCB

Sign off on the thermistor resistance check

Check No.11: Power Supply Waveforms Check

Measure the power supply waveform between No. 1 and No. 2 on the terminal board

Check if the power supply waveform is a sine wave (Fig.1)

Check if there is waveform disturbance near the zero-cross (sections circled in Fig.2)

Sign off on the power supply waveforms check

Check No.16: Make sure that the voltage of 320 is applied.

1. Set operation off and power off. Disconnect the connector S70.

2. Check that the voltage between the pins 4 - 7 is 320 VDC.

3. Check that the control voltage between the pins 3 - 4 is 15 VDC.

4. Check that the rotation command voltage between the pins 2 - 4 is 0 ~ 6.5 VDC.

5. Keep operation off and power off. Connect the connector S70.

6. Check whether 4 pulses (0 ~ 15 VDC) are input at the pins 1 - 4 when the fan motor is rotated 1 turn by hand.

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

If NG in step 2 → Defective PCB → Replace the outdoor unit PCB (main PCB).

Warning: Ensure the voltage between (+) and (-) of the power module is about 0 V before proceeding.

Voltage between (+) and (-) of the power module is about 0 V?

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

Compressor harness connector disconnected from the outdoor unit PCB?

Measure resistance between the terminals of the power module and the terminals of the compressor with a multimeter.

Enter the resistance measurement

Evaluate the measurement results

Sign off on the power module check