Daikin Heat Pump Outdoor Unit RXS18LVJU

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.

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.

EV connector correctly connected to the PCB

Does the EV generate a latching sound when power is turned off and on again?

Continuity confirmed when connector is disconnected and checked with a tester

Check the continuity between the pins

If there is no continuity between the pins, the EV coil is faulty

If the continuity is confirmed in step 3, the outdoor unit PCB is faulty

Note: Please note that 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.

Check the connection of connector

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

Check the motor control voltage (pins 4 - 3)

Check the rotation command voltage (pins 4 - 2)

Check the rotation pulse (pins 4 - 1)

Sign off on the fan motor connector output check