Daikin Indoor Wall Mounted Unit FTXN09KEVJU

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

Voltage between (+) and (–) of the diode bridge (DB1) is approx. 0 V

Disconnect the compressor harness connector from the outdoor unit PCB. To disengage the connector, press the protrusion on the connector.

Compressor harness connector successfully disconnected from the outdoor unit PCB

Measure resistance between the terminals of the DB1 and the terminals of the compressor with a multi-tester.

Enter the resistance measurement between the terminals of the DB1 and the terminals of the compressor

Evaluate the measurement results for a judgment

Sign off on the power module check

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.

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

Remove the panels according to the “Removal of Outer Panels”.

1 Remove the nut of the outdoor fan.

When reassembling, align mark of the outdoor fan with Dcut section of the motor shaft.

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)

Enter the resistance between the pins of the DB1

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

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.

Terminals of the compressor disconnected

Warning: Be careful not to burn yourself 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.

Warning: Since it may happen that the refrigerant oil in the compressor catches fire, prepare a wet cloth so as to extinguish fire immediately.

Caution: For environment protection, do not discharge the refrigerant gas in the atmosphere. Make sure to collect all the refrigerant gas.

Piping restored by nonoxidation brazing