Daikin Indoor Wall Mounted Unit FTXN12KEVJU

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

Take care not to cut your finger by the fins of the outdoor heat exchanger.

When reassembling, make sure to fit the 3 hooks.

1 Remove the screw of the stop valve cover. Pull down the stop valve cover and remove it.

2 Remove the 3 screws (right: 1 screw, left: 2 screws) and remove the top panel.

3 Remove the 5 screws of the front panel.

4 Lift up the left side and unfasten the hooks.

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 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

Is the resistance measurement within the acceptable range?

Sign off on the power module check

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

Remove the screw and four-way valve coil.

Disconnect the terminals of the compressor.

Remove the electronic expansion valve coil.

Before working, make sure that the refrigerant gas is empty in the circuit.

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.

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