Daikin Slim Duct Indoor Units FDXS50CVMB

Voltage of 320 ± 30 V is applied

Set operation off and power off. Disconnect the connector S70

Control voltage between the pins 3 - 4

Rotation command voltage between the pins 2 - 4

Keep operation off and power off. Connect the connector S70

2 pulses (0 ~ 15 VDC) are output at the pins 1 - 4 when the fan motor is rotated 1 turn by hand

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

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

Enter the resistance measurement

Resistance measurement within 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.

Removed the electrical box cover

Removed the screw of the shield plate

Unfastened the 2 hooks and removed the shield plate

Unfastened the 4 hooks of the electrical box cover and removed it

Disconnected the connector for the fan motor [S70]

Released the fan motor lead wire from the 7 hooks

Removed the washer fitted nut of the outdoor fan

Removed the lower 2 screws from the fan motor first

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

Pull out the electronic expansion valve coil.

Warning: Be careful not to get yourself burnt 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.)

Caution: From the viewpoint of global environment protection, do not discharge the refrigerant gas in the atmosphere. Make sure to collect all the refrigerant gas.

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

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

Heat up the 2 brazed parts of the electronic expansion valve and remove it.

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

Remove the sound blanket (back)

Remove the sound blanket (outer)

Since the piping ports are torn easily, remove the sound blanket carefully.

Remove the sound blanket (top upper)

Remove the sound blanket (top lower)

Remove the sound blanket (inner)

Release the discharge pipe thermistor

Be careful not to lose the clip for the thermistor.