Daikin Cooling-Only Outdoor Unit RKN24KEVJU

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 for direct mounted models?

Measure the resistance of the directly mounted thermistor

Sign off on the thermistor resistance check

1. Check that the voltage between the pins 10 - 11 is 15 VDC.

2. Check if the Hall IC generates the rotation pulse (0 ~ 15 VDC) 4 times between the pins 10 -12, 10 - 13, when the fan motor is manually rotated once.

Make sure that the voltage of 320 ± 30 V is applied.

1. Set operation off and power off. Disconnect the connector S70.

2. Check that the voltage between the pins 4 - 7 is 320 VDC.

3. Check that the control voltage between the pins 3 - 4 is 15 VDC.

4. Check that the rotation command voltage between the pins 2 - 4 is 0 ~ 15 VDC.

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

Enter the play between the side face of the rotor and the bottom frame in mm

Fan motor and the fan rotor reassembled correctly

Sign off on the fan motor / fan rotor removal

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)

Is the voltage approximately 0V?

If voltage is not approximately 0V, stop the procedure and report the issue.

Enter the resistance between the pins of the DB1

Is the resistance 'infinity' or less than 1 kW?

If the resistance is 'infinity' or less than 1 kW, a short circuit occurs on the main circuit.

Sign off on the main circuit short check

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

Remove the front panel according to "Removal of the Air Filters / Front Panel".

You can remove the front grille without detaching the service cover.

1 Remove the screw and remove the service cover.

1 Remove the 3 screws of the front grille.

Refer to the removal procedure in a reverse way when reassembling.