Daikin Cooling-Only Outdoor Unit RKS50G2V1B

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

Pull out the electronic expansion valve coil.

Warning: Be careful not to get yourself burnt with the pipes and other parts that are heated by the gas brazing machine.

Warning: If the refrigerant gas leaks during work, ventilate the room. (If the refrigerant gas is exposed to flames, toxic gas may be generated.)

Caution: From the viewpoint of global environment protection, do not discharge the refrigerant gas in the atmosphere. Make sure to collect all the refrigerant gas.

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 the 2 brazed parts of the electronic expansion valve and remove it.

Warning: Ensure that the voltage between (+) and (–) of the diode bridge (DB1) is approximately 0 V before proceeding

Voltage between (+) and (–) of the diode bridge (DB1) is approximately 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 successfully disconnected from the outdoor unit PCB

Measure resistance between the terminals of the DB1 and the terminals of the compressor with a multi-tester.

Enter the resistance measurement between the terminals of the DB1 and the terminals of the compressor

Evaluate the measurement results for a judgment

Sign off on the power module check

With the power on, operation off, and the connector connected, check the following

Output voltage of about 5 V between pins 1 and 3

Generation of 3 pulses between pins 2 and 3 when the fan motor is operating

If NG in step 1 Æ Defective PCB Æ Replace the PCB

If NG in step 2 Æ Defective Hall IC Æ Replace the fan motor

If OK in both steps 1 and 2 Æ Replace the PCB

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

Removed the 4 screws and lifted the top panel.

Removed the 4 screws and removed the discharge grille.

Removed the 6 screws of the front panel.

Pushed the front panel and lifted the shield plate to unfasten the hooks.

Unfastened the left side hooks, and then the right side hook.

Lifted the front panel while pushing the left side panel inwards.

Lifted the front panel and unfastened the right side hook.

Removed the screw of the stop valve cover.

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

Did you wait for 10 minutes after turning off all power supplies?

Remove the screw and remove the four way valve coil.

Did you remove the screw and the four way valve coil?

Warning: Be careful not to get yourself burnt with the pipes and other parts that are heated by the gas brazing machine.

Warning: If the refrigerant gas leaks during work, ventilate the room. (If the refrigerant gas is exposed to flames, toxic gas may be generated.)

Caution: From the viewpoint of global environment protection, do not discharge the refrigerant gas in the atmosphere. Make sure to collect all the refrigerant gas.

Cautions for restoration: Restore the piping by nonoxidation brazing.

Did you restore the piping by nonoxidation brazing?