Daikin Outdoor Heat Pump RXN24KEVJU

1. Check the connection of connector.

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

3. Check the motor control voltage (pins 4 - 3).

4. Check the rotation command voltage (pins 4 - 2).

5. Check the rotation pulse (pins 4 - 1).

Fan motor wire breakdown / short circuit check

1. Check the connector for connection.

EV connector correctly connected to the PCB

EV generates latching sound when power is turned off and on

Continuity present when connector is disconnected and checked with a tester

Check continuity between the following pins

EV coil is not faulty if there is continuity between the pins

Outdoor unit PCB is not faulty if continuity is confirmed

Note: Latching sound varies depending on the valve type

Sign off on the electronic expansion valve check

Warning: This procedure requires trained personnel with PPE!

Install the inverter checker instead of a compressor

Charged voltage of the built-in smoothing electrolytic capacitor dropped to 10 VDC or below?

Terminals removed from the compressor?

Terminals connected to the terminals of the inverter checker?

Warning: Do not touch the terminals (U,V,W) each other. High voltage is applied.

09/12 class: Activate power transistor test operation from indoor unit.

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

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

Disconnect the refrigerant piping.

Preparation: Remove the electrical box according to the “Removal of Electrical Box / PCBs / Swing Motors”.

Caution: If the refrigerant leaks, repair the spot of leaking, then collect all refrigerant from the unit. After conducting vacuum drying, recharge proper amount of refrigerant.

Caution: In pump-down work, be sure to stop the compressor before disconnecting the refrigerant pipe. If the refrigerant pipe is disconnected with the compressor operating and the stop valve open, air may be sucked in and may generate an over-pressure in refrigeration cycle, thus resulting in pipe rupture or accidental injury.

Place a plastic sheet under the drain pan to prevent from wetting the floor with remaining drain.

If the drain hose is embedded in the wall, disconnect the drain hose beforehand.

Carry out the removal works with 2 wrenches.

When the pipings are disconnected, protect both the openings of pipe and unit from entering of moisture.