Daikin Outdoor Heat Pump RXS25G2V1B9

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

Remove 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.

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.

Disconnect the brazed part where is easy to disconnect and restore.

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

Preparation: Remove the panels and disconnect the connector for the fan motor according to the “Removal of Outer Panels / Fan Motor”.

Disconnect the connector for the overload protector [S40]

Disconnect the connector for the four way valve coil [S80]

Disconnect the 2 connectors for the reactor

Disconnect the relay connector for the compressor

Disconnect the connector for the electronic expansion valve coil [S20]

Pull out the outdoor heat exchanger thermistor. Be careful not to lose the clip for the thermistor.

EV connector correctly connected to the PCB

EV generates latching sound when power is turned off and on again

If EV does not generate latching sound, proceed to next step

Continuity confirmed when connector is disconnected and tested with a tester

Check continuity between the following pins

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

If continuity is confirmed, the outdoor unit PCB is faulty

Note: The latching sound varies depending on the valve type

Sign off on the electronic expansion valve check

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

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

Pull out the electronic expansion valve coil.

Disconnect the lead wires of the compressor.

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.