Daikin Heat Pump Outdoor Unit RXS15LVJU

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

Disconnect the lead wires of the compressor.

Warning: Use caution to avoid burning yourself with pipes and other parts that are heated by the gas brazing.

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

Warning: If the refrigerant oil in the compressor catches fire, have a wet cloth prepared to extinguish the fire immediately.

Caution: For global environmental protection, do not discharge the refrigerant gas in the atmosphere. Make sure to collect all the refrigerant gas.

Remove the 2 nuts of the compressor.

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

Removed the 2 nuts of the compressor?

Warning: Be careful not to get yourself burnt with 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.)

Warning: Since it may happen that the refrigerant oil in the compressor catches fire, prepare wet cloth so as to extinguish fire immediately.

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.

Restored 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 (248°F).) For the sake of this, wrap the four-way valve with wet cloth and provide water so that the cloth does not dry.

Disconnected the brazed part where is easy to disconnect and restore?

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 protection plate.

Remove the screws and remove the connecting wires and the power supply wires.

Remove the 2 screws of the conduit mounting plate.

Remove the conduit mounting plate.

Remove the 2 screws and remove the ground wire.

Pull out the outdoor temperature thermistor.

Remove the 4 screws of the right side panel.

Warning: This check requires trained personnel with PPE!

EV connector correctly connected to the PCB

Did the EV generate a latching sound after power cycle?

Continuity confirmed using a tester after disconnecting the connector

Check the continuity between the pins

EV coil faulty if no continuity between the pins

Outdoor unit PCB faulty if continuity confirmed in step 3

Note: The latching sound varies depending on the valve type.

Sign off on the electronic expansion valve check

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.

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.

Warning: Use caution to avoid burning yourself with pipes and other parts that are heated by the gas brazing.

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

Caution: For global environmental protection, do not discharge the refrigerant gas in the atmosphere. Make sure to collect all the refrigerant gas.

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