Daikin Indoor Unit Wall Mounted Type FTXS50D2V1W

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

1 External appearance of model. the service PCB and the terminal board.

2 Loosen the 1 screw of the terminal board and open it.

3 Disconnect the connector [S52] and [S102] from the service PCB.

4 Widen the upper hook and pull the service PCB upward to remove.

1 Disconnect the each connectors on the terminal board.

Conduct the followings to check the electronic expansion valve (EV).

1. Check to see if the EV connector is correctly inserted in the PCB. Compare the EV unit and the connector number.

2. Turn the power off and back on again, and check to see if all the EVs generate latching sound.

3. If any of the EVs does not generate latching noise in the above step 2, disconnect that connector and check the conductivity using a tester.

Check the conductivity between pins 1, 3 and 6, and between pins 2, 4 and 5. If there is no conductivity between the pins, the EV coil is faulty.

4. If no EV generates latching sound in the above step 2, the outdoor unit PCB is faulty.

5. If the conductivity is confirmed in the above step 2, mount a good coil (which generated latching sound) in the EV unit that did not generate latching sound, and check to see if that EV generates latching sound.

∗If latching sound is generated, the outdoor unit PCB is faulty.

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

Warning: Ventilate when refrigerant leaks during the work. (If refrigerant contacts fire, it will cause to arise toxic gas.)

Caution: Be careful not to get yourself burnt with the pipes and other parts that are heated by the gas welding rod.

Caution: From the viewpoint of global environment protection, do not discharge the refrigerant gas in the atmosphere. Make sure to recover the refrigerant gas with the recovery system.

Refrigerant gas recovered with the recovery system?

Sign off on the distributor removal

2. Check motor power supply voltage output (pins 4-7 and 4-8).

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

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

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

2. Check motor control voltage output (pins 2-1).;

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

Be sure to apply nitrogen replacement when heating up the brazed part.

1. Restore the piping by nonoxidation brazing.

In case of you cannot use the nitrogen gas, restore as quickly as possible.

2. It is required to prevent the carbonization of the oil inside the four way valve and the deterioration of the gaskets affected by heat. For the sake of this, wrap the four way valve with wet cloth and provide water so that the cloth will not be dried and avoid excessive heating. (Keep below 120°C)

Be careful so as not to break the pipes by pressing it excessively by pliers when withdrawing it.

In case of the difficulty with gas brazing machine

1. Disconnect the brazed part where is easy to disconnect and restore.