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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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Drive Motor
B2 Rollers
Tensioning System
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Daikin Outdoor Unit Air Conditioner RXL24WMVJU9

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Maintenance Plans for Daikin Outdoor Unit Air Conditioner Model RXL24WMVJU9

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Main Circuit Short Check

Warning: Ensure the voltage between (+) and (-) of the diode bridge (DB1) is about 0 V before proceeding

Enter the voltage between (+) and (-) of the diode bridge (DB1)

Is the voltage approximately 0 V?

If voltage is not approximately 0 V, stop the procedure and report the issue

Enter the resistance between the pins of the DB1

Is the resistance either infinity or less than 1 kΩ?

If resistance is not infinity or less than 1 kΩ, a short circuit occurs on the main circuit

Sign off on the main circuit short check

Run this procedure

Power Module Check

Warning: Ensure the voltage between (+) and (–) of the power module is about 0 V before proceeding

Voltage check successful?

Disconnect the compressor harness connector from the outdoor unit PCB. To disengage the connector, press the protrusion on the connector.

Connector disengaged successfully?

Measure resistance between the terminals of the power module and the terminals of the compressor with a multimeter.

Enter the resistance measurement

Evaluate the measurement results

Sign off on the power module check

Run this procedure

Electronic Expansion Valve Check

EV connector correctly connected to the PCB

Does the EV generate a latching sound when power is turned off and on again?

Continuity confirmed when connector is disconnected and checked with a multimeter

Check the continuity between the pins

EV coil is not faulty

Outdoor unit PCB (main PCB) is not faulty

Sign off on the electronic expansion valve check

Run this procedure

Outdoor Fan Motor Check

Make sure that the voltage is within 320 VDC.

1. Set operation off and power off. Disconnect the connector S70 or S71.

2. Check that the voltage between the pins 4 - 7 is 320 VDC.

3. Check that the control voltage between the pins 4 - 3 is 15 VDC.

4. Check that the rotation command voltage between the pins 4 - 2 is 0 ~ 6.5 VDC.

5. Keep operation off and power off. Connect the connector S70 or S71.

6. Check whether 4 rotation pulses (0 ~ 15 VDC) are input at the pins 4 - 1 when the fan motor is rotated 1 turn by hand.

When the fuse is melted, check the outdoor fan motor for proper function.

If NG in step 2 -> Defective PCB -> Replace the outdoor unit PCB (main PCB).

Run this procedure

Thermistor Resistance Check

Warning: This procedure requires trained personnel with PPE!

Disconnect the connector of thermistor ASSY from the PCB to measure the resistance between the pins using multimeter.

Enter the measured resistance value

Does the measured resistance value match the listed value?

To check the thermistor soldered on a PCB, disconnect the PCB from other PCB/parts, and measure the resistance between the both ends of soldered thermistor.

Enter the measured resistance value for the soldered thermistor

Does the measured resistance value for the soldered thermistor match the listed value?

Note: When replacing the defective thermistor(s), replace the thermistor as ASSY.

Sign off on the thermistor resistance check

Run this procedure