Daikin Outdoor Unit for Multi-Split System 2MXS18GVJU

Warning: Be sure to wait for 10 minutes or more after turning off all power supplies before disassembling work.

Remove the 4 screws of the top panel

Remove the 6 screws of the front panel

Remove the 4 screws of the discharge grille

Remove the 2 screws of the stop valve cover

Sign off on the outer panels removal

Warning: Ensure that the voltage between (+) and (–) of the power module (PM1) is approx. 0 V before proceeding.

Voltage between (+) and (–) of the power module (PM1) is approx. 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 multi-tester.

Enter the resistance measurement

Evaluate the measurement results

Sign off on the power module check

Warning: Be sure to wait for 10 minutes or more after turning off all power supplies before disassembling work.

Before working, make sure that the refrigerant gas is empty in the circuit.

Be sure to apply nitrogen replacement when heating up the brazed part.

Heat up and disconnect the 5 brazed parts to remove the distributor.

Note: Do not use a metal saw for cutting pipes or sawdust will enter the circuit.

When withdrawing the pipes, be careful not to pinch them firmly with pliers. The pipes may get deformed.

Provide a protective sheet or a steel plate so that the brazing flame cannot influence peripheries.

Sign off on the distributor removal

Warning: This procedure requires trained personnel with PPE!

Install the inverter checker 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 checker without touching each other?

Activate the power transistor test operation from the outdoor unit

Forced operation [ON/OFF] switch pressed for 5 seconds?

Diagnose according to 6 LEDs lighting status

Check the connection of connector

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

Check motor control voltage (pins 4 - 3)

Check rotation command voltage output (pins 4 - 2)

Check rotation pulse input (pins 4 - 1)

Sign off on the fan motor connector check