The Daikin Slim Duct Concealed Indoor Unit FDXS09LVJU is an efficient and compact air conditioning solution designed for residential and commercial spaces. This model offers quiet operation and effective temperature control, making it ideal for concealed installations. Experience reliable performance and energy savings with Daikin's advanced technology.

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Manual for Daikin Slim Duct Concealed Indoor Unit FDXS09LVJU

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Tensioning Guide
Belt-diagram
C-120 pulleys
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Work Order Templates

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Daily Electrical System Inspection
Replace Roller and Pulley
Install Engine B-120
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Drive Motor
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Daikin Slim Duct Concealed Indoor Unit FDXS09LVJU

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Maintenance Plans for Daikin Slim Duct Concealed Indoor Unit Model FDXS09LVJU

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Rotation Pulse Check on the Outdoor Unit PCB

Outdoor fan motor check

Voltage of 320 ± 30 V is applied

Set operation off and power off. Disconnect the connector S70.

Voltage between the pins 4 - 7

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) at the pins 1 - 4 when the fan motor is rotated 1 turn by hand

Fuse is not melted

Run this procedure

Thermistor Resistance Check

Warning: Disconnect the connectors of the thermistors from the PCB before proceeding

Thermistors disconnected from the PCB?

Measure the resistance of each thermistor using tester

Note: The relationship between normal temperature and resistance is shown in the table and the graph below

The room temperature thermistor is directly mounted on the display PCB. Remove the display PCB from the control PCB to measure the resistance.

Display PCB removed from the control PCB?

Measure the resistance of the room temperature thermistor

When the indoor heat exchanger thermistor is soldered on the PCB, remove the thermistor and measure the resistance.

Indoor heat exchanger thermistor removed from the PCB?

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Power Supply Waveform Check

Warning: This procedure requires trained personnel with PPE!

Measure the power supply waveform between No. 1 and No. 2 on the terminal board

Upload a photo of the measured waveform

Is the power supply waveform a sine wave as shown in Fig.1?

Is there waveform disturbance near the zero cross as shown in the sections circled in Fig.2?

Sign off on the power supply waveform check

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Hall IC Check

Check the connector connection

Output voltage between pins 1 and 3

Number of pulses between pins 2 and 3 when the fan motor is operating

If NG in step 1

If NG in step 2

If OK in both steps 1 and 2

Sign off on the Hall IC Check

Run this procedure

Outdoor Electronic Expansion Valve Check

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

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

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

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

Check the continuity between the pins 1 - 6 and 3 - 6, and between the pins 2 - 5 and 4 - 5. If there is no continuity 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 continuity is confirmed in the above step 3, 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.

If latching sound is not generated, the EV unit is faulty.

Run this procedure