Daikin Outdoor Heat Pump RXS35G2V1B9

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.

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.

RK(X)S20-50G2V1B, ARXS20-50G2V1B

Control voltage between the pins 3 - 4

Rotation command voltage between the pins 2 - 4

Pulses output at the pins 1 - 4 when the fan motor is rotated 1 turn by hand

Check if the outdoor fan motor is functioning properly if the fuse is melted

If NG in step 2 → Defective PCB → Replace the outdoor unit PCB

If NG in step 4 → Defective Hall IC → Replace the outdoor fan motor

If OK in both steps 2 and 4 → Replace the outdoor unit PCB

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

Enter the voltage between (+) and (–) of the diode bridge (DB1)

Measure the resistance between the pins of the DB1.

Enter the resistance between the pins of the DB1

Is the resistance ∞ or less than 1 kΩ?

If the resistance is ∞ or less than 1 kΩ, short circuit occurs on the main circuit.

Sign off on the main circuit short check