Daikin Outdoor Heat Pump RXS50G2V1B

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

Remove the 2 screws of the shield plate

Preparation: Remove the top panel and the front panel according to the “Removal of Outer Panels”.

Slide the shield plate upward to unfasten the 1 hook on the bottom left, and then remove the shield plate.

Disconnect the 2 power supply cables and the 1 earth wire.

Remove the 3 screws of the right side panel.

Remove the screw of the electrical box.

Unfasten the hooks and remove the right side panel.

Warning: Disconnect the connectors of the thermistors from the PCB before proceeding

Thermistors disconnected from the PCB?

Measure the resistance of each thermistor using tester

Select the model of the thermistor

For the models in which the thermistor is directly mounted on the PCB, disconnect the connector for the PCB and measure.

Thermistor disconnected from the PCB and measured?

Sign off on the thermistor resistance check

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

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

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

Remove the screw and remove 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.

It is required to prevent the carbonization of the oil inside the four way valve and the deterioration of the gaskets affected by heat. (Keep below 120°C.) For the sake of this, wrap the four way valve with wet cloth and provide water so that the cloth does not dry.

Note: Do not use a metal saw for cutting pipes by all means because the sawdust comes into the circuit.

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