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Documents & Manuals

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

Pre-built workflows to keep your asset running smoothly.

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 Outdoor Unit Standard Multi-Split Type Air Conditioner 4MXS36WMVJU9

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Maintenance Plans for Daikin Outdoor Unit Standard Multi-Split Type Air Conditioner Model 4MXS36WMVJU9

Integrate maintenance plans directly into your work orders in MaintainX.

Main Circuit Short Check

Check to make sure that the voltage between (+) and (–) of the diode bridge (DB1) is about 0 V before checking

Measure the resistance between the pins of the DB1 referring to the table below.

If the resistance is infinity or less than 1 k, short circuit occurs on the main circuit.

5MXS, 4MXL(H)

1. Turn the power off.

2. Remove the top plate (10 screws).

3. Remove the right side plate (6 screws).

4. Remove the front plate (1 screw).

The front plate is heavy, so take care.

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 of the thermistor

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 of the soldered thermistor

Does the measured resistance value match the listed value?

If the measured resistance value does not match the listed value, the thermistor must be replaced.

Was the thermistor replaced?

Sign off on the thermistor resistance check

Run this procedure

Outdoor Fan Motor Check

Warning: This procedure requires trained personnel with PPE!

Voltage of 320 ± 30 V 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.

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

Fuse melted?

Run this procedure

Capacitor Voltage Check

Warning: This procedure requires trained personnel with PPE!

Before this check, be sure to check the main circuit for short circuit.

Circuit breaker is still on

Measure the voltage according to the drawing of the model in question. Be careful never to touch any live parts.

Voltage between FU2 and DC–

Voltage between FU2 and DC– is 50 V or less

The surface of the test points (DC–) may be covered with the coating. Be sure to make firm contact between the multimeter probes and the test points.

Before this check, be sure to check the main circuit for short circuit.

Circuit breaker is still on

Run this procedure

Electronic Expansion Valve Check

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

1. Check 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 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 multimeter.

Check the continuity between the pins 5 - 1, 5 - 2, 5 - 3, 5 - 4. If there is no continuity between the pins, the EV coil is faulty.

4. If no EV generates a 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 a latching sound, and check if that EV generates a latching sound.

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

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

Run this procedure