Daikin Outdoor Heat Pump RXB09AXVJU

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.

4 pulses (0 ~ 15 VDC) are output 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

If NG in step 4 : Defective Hall IC

EXV connector correctly connected to PCB

EXV generates a latching sound when power is turned off and on

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

Continuity confirmed when connector is disconnected and checked with a multimeter

Check the continuity between pins

For harness 5P models, check the continuity between pins

EXV coil is not faulty if there is continuity between the pins

If continuity is confirmed, proceed to next step

Outdoor PCB is not faulty if continuity is confirmed in previous step

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?

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

Sign off on the main circuit short check

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

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