Daikin Outdoor Heat Pump RX71GV1B

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: This check requires trained personnel with PPE!

Before this check, be sure to check the main circuit for short circuit.

With the circuit breaker still on, measure the voltage according to the drawing of the model in question. Be careful never to touch any live parts.

Voltage between P (+) and N (–)

The surface of the test points (P, N) may be covered with the coating. Be sure to make firm contact between the multimeter probes and the test points.

Sign off on the capacitor voltage check

Check the connection of connector

Check the motor power supply voltage output (pins 4 - 7)

Check the motor control voltage (pins 4 - 3)

Check the rotation command voltage (pins 4 - 2)

Check the rotation pulse (pins 4 - 1)

Sign off on the connector output check

Check No.11: Power Supply Waveforms Check

Upload a photo of the power supply waveform between No. 1 and No. 2 on the terminal board

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

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

Sign off on the power supply waveforms check

Warning: This check is for RX50/60G2V1B9, RX50/60G3V1B, RX60G4V1B only

Voltage between (+) and (–) of the diode bridge (DB1)

Ensure the voltage is about 0 V before proceeding

Resistance between the pins of the DB1

Is the resistance ∞ or less than 1 kΩ?

If yes, a short circuit occurs on the main circuit.

Sign off on the main circuit short check