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Documents & Manuals

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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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Procedures

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Motion Industries
Applied Industrial Technologies
Electrical Brothers
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Parts

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Drive Motor
B2 Rollers
Tensioning System
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Daikin Slim Duct Concealed Indoor Unit FDXS12LVJU

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Maintenance Plans for Daikin Slim Duct Concealed Indoor Unit Model FDXS12LVJU

Integrate maintenance plans directly into your work orders in MaintainX.

Hall IC Check

CDXS/FDXS Series

Check the connector connection

With the power on, operation off, and the connector connected, check the following

Output voltage of about 5 V between pins 1 and 3

Generation of 3 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

Run this procedure

Power Supply Waveform Check

Warning: This check requires trained personnel with PPE!

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

Check if the power supply waveform is a sine wave

Upload a photo of the waveform

Check if there is waveform disturbance near the zero cross

Sign off on the power supply waveform check

Run this procedure

Power Module Check

Warning: Ensure that the voltage between (+) and (–) of the power module (PM1) is approx. 0 V before proceeding

Voltage between (+) and (–) of the power module (PM1) 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 power module and the terminals of the compressor with a multi-tester.

Enter the resistance measurement

Evaluate the measurement results

Sign off on the power module check

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 the room temperature thermistor

Remove the display PCB from the control PCB to measure the resistance

Display PCB removed from the control PCB?

Measure the resistance of the indoor heat exchanger thermistor

Remove the thermistor from the PCB to measure the resistance

Thermistor removed from the PCB?

Measure the resistance of the removed thermistor

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