Daikin Heat Pump Outdoor Unit RXS30LVJU

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

1. Remove the electronic expansion valve coil.

1 Pull the electronic expansion valve coil out.

You can remove the thermistor ASSY with the electrical box on.

(1) Disconnect [S90] from the electrical box (main PCB).

(2) Release the thermistor harness from the hook at the bottom of electrical box.

(3) Pull out the clamp of the thermistor harness from the hole of the electrical box.

1 Pull out the outdoor heat exchanger thermistor.

EV connector correctly connected to the PCB

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

Continuity present when connector is disconnected and checked with a tester

Check the continuity between the pins

Note: The latching sound varies depending on the valve type

Sign off on the electronic expansion valve check

Warning: Disconnect the connectors of the thermistors from the PCB before proceeding

Thermistors disconnected from the PCB

Measure the resistance of each thermistor

Note: The relationship between normal temperature and resistance is shown in the table and the graph below

The room temperature thermistor is directly mounted on the display PCB. Remove the display PCB from the control PCB to measure the resistance

Display PCB removed from the control PCB

Measure the resistance of the room temperature thermistor

When the indoor heat exchanger thermistor is soldered on the PCB, remove the thermistor and measure the resistance

Indoor heat exchanger thermistor removed from the PCB

With the power on, operation off, and the connector connected, check the following

Output voltage of about 5 V between pins 1 and 3

Generation of 3 pulses between pins 2 and 3 when the fan motor is operating

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

Preparation: Remove the electrical box according to the “Removal of Electrical Box”.

Disconnect the connectors [S52] [S102] from the service monitor PCB

Detach the 4 clamps with pliers and remove the service monitor PCB

Remove the screws of the terminal board and the ground wire