Daikin 2MXL18QMVJU - Service Manual

Service
Manual
2/3MXL-Q Series
SiUS121632EA
[Applied Models]
z Inverter Multi : Heat Pump
Multi-Split Type Air Conditioners

Summary

Part 1 List of Functions

1. Functions

Lists the various functions available for the air conditioning system.

1. Safety Cautions

1.1 Warnings and Cautions Regarding Safety of Workers

Safety warnings and precautions for personnel involved in repair work.

1.2 Warnings and Cautions Regarding Safety of Users

Safety warnings and precautions for end-users of the air conditioning product.

2. Icons Used

Explains the meaning of various icons used throughout the manual for clarity.

Part 2 Specifications

1. Indoor Unit

Details technical specifications for various indoor unit models.

1.1 CTXG Series

Specifications for CTXG series indoor units.

1.2 CTXS, FTXS Series

Specifications for CTXS and FTXS series indoor units.

1.3 FDXS, CDXS Series

Specifications for FDXS and CDXS series indoor units.

1.4 FVXS Series

Specifications for FVXS series indoor units.

1.5 FFQ Series

Specifications for FFQ series indoor units.

2. Outdoor Unit

Details technical specifications for the outdoor unit.

Part 3 Printed Circuit Board Connector Wiring Diagram

2. Wired Remote Controller

Wiring diagram for the wired remote controller.

2.1 BRC1 E73

Wiring diagram for the BRC1E73 wired remote controller.

3. Wireless Remote Controller Kit

Wiring diagrams for wireless remote controller kit components.

3.1 BRC082 A41 W, BRC082 A42 W(S)

Wiring diagrams for wireless remote controller kit components.

4. Outdoor Unit

Wiring diagrams for outdoor unit components.

Part 4 Functions and Control

4. Control Specification

Explains the control logic and specifications of the system.

4.1 Thermistor Functions

Explains the function of various thermistors used in the system.

4.2 Mode Hierarchy

Defines the hierarchy of operation modes and their priorities.

4.3 Frequency Control

Details how compressor frequency is controlled based on various parameters.

4.4 Controls at Mode Changing;Start-up

Explains controls during mode changes and startup.

4.5 Discharge Pipe Temperature Control

Details control based on discharge pipe temperature.

4.6 Input Current Control

Explains input current control for frequency upper limit.

4.7 Freeze-up Protection Control

Describes freeze-up protection during cooling operation.

4.8 Heating Peak-cut Control

Details heating peak-cut control to prevent abnormal high pressure.

4.9 Outdoor Fan Control

Explains control logic for the outdoor fan.

4.10 Liquid Compression Protection Function

Describes protection against liquid compression.

4.11 Defrost Control

Explains the defrost control cycle and conditions.

4.12 Low Hz High Pressure Limit

Details low Hz high pressure limit control.

4.13 Electronic Expansion Valve Control

Explains various control functions of the electronic expansion valve.

4.14 Malfunctions

Lists various malfunctions and their detection methods.

Part 5 Remote Controller

1. Applicable Remote Controller

Lists remote controllers compatible with the system.

2. ARC466 A36

Details the functions and operation of the ARC466A36 remote controller.

3. ARC452 A21

Details the functions and operation of the ARC452A21 remote controller.

4. ARC452 A23

Details the functions and operation of the ARC452A23 remote controller.

5. ARC466 A21

Details the functions and operation of the ARC466A21 remote controller.

6. BRC1 E73 (Wired Remote Controller)

Explains the operation and features of the BRC1E73 wired remote controller.

7. BRC082 A41 W, BRC082 A42 W(S) (Wireless Remote Controller Kit)

Details the functions of the wireless remote controller kit.

Part 6 Service Diagnosis

1. General Problem Symptoms and Check Items

Lists common problems and initial checks for diagnosis.

2. Troubleshooting with LED

Guides troubleshooting based on indoor and outdoor unit LED indicators.

2.1 Indoor Unit

Troubleshooting indoor unit errors indicated by LED status.

2.2 Outdoor Unit

Troubleshooting outdoor unit errors indicated by LED status.

3. Service Diagnosis

Provides service diagnosis procedures for specific unit series.

3.1 CTXG, CTXS, FTXS, CDXS, FDXS, FVXS Series

Service diagnosis steps for CTXG, CTXS, FTXS, CDXS, FDXS, FVXS series.

3.2 FFQ Series

Service diagnosis steps for FFQ series.

4. Code Indication on Remote Controller

Lists error codes displayed on remote controllers and their meanings.

4.1 CTXG, CTXS, FTXS, CDXS, FDXS, FVXS Series

Error codes for CTXG, CTXS, FTXS, CDXS, FDXS, FVXS series.

4.2 FFQ Series

Error codes for FFQ series.

4.3 Outdoor Unit

Error codes indicated by outdoor unit LEDs.

5. Troubleshooting for CTXG, CTXS, FTXS, CDXS, FDXS, FVXS Series

Specific troubleshooting steps for CTXG, CTXS, FTXS, CDXS, FDXS, FVXS series.

5.1 Indoor Unit PCB Abnormality

Troubleshooting for indoor unit PCB abnormalities.

5.2 Freeze-up Protection Control;Heating Peak-cut Control

Troubleshooting freeze-up protection and heating peak-cut.

5.3 Indoor Fan Motor or Related Abnormality

Troubleshooting indoor fan motor (DC Motor) or related issues.

5.4 Thermistor or Related Abnormality

Troubleshooting thermistor or related abnormalities.

5.5 Front Panel Open;Close Fault

Troubleshooting front panel open/close mechanism faults.

5.6 Signal Transmission Error (Between Indoor Unit and Outdoor Unit)

Troubleshooting signal transmission errors between indoor and outdoor units.

5.7 Mismatching of Indoor Unit and Outdoor Unit

Troubleshooting mismatches between indoor and outdoor units.

6. Troubleshooting for FFQ Series

Specific troubleshooting steps for FFQ series.

6.1 Indoor Unit PCB Abnormality

Troubleshooting for FFQ series indoor unit PCB abnormalities.

6.2 Drain Level Control System Abnormality

Troubleshooting FFQ series drain level control system abnormalities.

6.3 Indoor Fan Motor (DC Motor) or Related Abnormality

Troubleshooting FFQ series indoor fan motor (DC Motor) issues.

6.4 Humidifier or Related Abnormality

Troubleshooting humidifier or related abnormalities in FFQ series.

6.5 Thermistor or Related Abnormality

Troubleshooting thermistor or related abnormalities in FFQ series.

6.6 Presence Sensor or Floor Sensor Abnormality

Troubleshooting presence or floor sensor abnormalities in FFQ series.

6.7 Remote Controller Thermistor Abnormality

Troubleshooting remote controller thermistor abnormalities in FFQ series.

6.8 Signal Transmission Error (Between Indoor Unit and Outdoor Unit)

Troubleshooting signal transmission errors in FFQ series.

6.9 Signal Transmission Error (Between Indoor Unit and Remote Controller)

Troubleshooting signal transmission errors between indoor unit and remote controller.

6.10 Signal Transmission Error (Between MAIN Remote Controller and SUB Remote Controller)

Troubleshooting signal transmission between main and sub remote controllers.

6.11 Mismatching of Indoor Unit and Outdoor Unit

Troubleshooting mismatches between indoor and outdoor units in FFQ series.

7. Troubleshooting for Outdoor Unit

Troubleshooting steps for outdoor unit malfunctions.

7.1 Refrigerant Shortage

Troubleshooting refrigerant shortage in the outdoor unit.

7.2 Low-voltage Detection or Over-voltage Detection

Troubleshooting low/over-voltage detection in the outdoor unit.

7.3 Wiring Error Check Unexecuted

Troubleshooting error when wiring check is not executed.

7.4 Unspecified Voltage (Between Indoor Unit and Outdoor Unit);Anti-icing Control in Other Rooms

Addressing unspecified voltage and anti-icing in other rooms.

7.5 Anti-icing Control for Indoor Unit

Details anti-icing control for indoor units.

7.6 Outdoor Unit PCB Abnormality

Troubleshooting for outdoor unit PCB malfunctions.

7.7 OL Activation (Compressor Overload)

Explains OL activation and compressor overload issues.

7.8 Compressor Lock

Troubleshooting for compressor lock conditions.

7.9 DC Fan Lock

Troubleshooting for DC fan lock issues.

7.10 Input Overcurrent Detection

Details input overcurrent detection and troubleshooting.

7.11 Four Way Valve Abnormality

Troubleshooting for four-way valve abnormalities.

7.12 Discharge Pipe Temperature Control

Explains discharge pipe temperature control and related errors.

7.13 High Pressure Control in Cooling

Details high pressure control in cooling operation.

7.14 Compressor Sensor System Abnormality

Troubleshooting for compressor sensor system abnormalities.

7.15 Position Sensor Abnormality

Troubleshooting for position sensor abnormalities.

7.16 CT or Related Abnormality

Troubleshooting for CT or related abnormalities.

7.17 Thermistor or Related Abnormality (Outdoor Unit)

Troubleshooting for outdoor unit thermistor abnormalities.

7.18 Electrical Box Temperature Rise

Troubleshooting for electrical box temperature rise.

7.19 Radiation Fin Temperature Rise

Troubleshooting for radiation fin temperature rise.

7.20 Output Overcurrent Detection

Details output overcurrent detection and troubleshooting.

Part 7 Trial Operation and Field Settings

1. Pump Down Operation

Procedure for pump down operation when relocating or disposing of the unit.

2. Forced Cooling Operation

Steps to perform forced cooling operation for testing or maintenance.

3. Wiring Error Check Function

Explains the function and procedure for checking wiring errors.

4. Trial Operation

Guidelines for performing trial operation to ensure proper function.

4.1 CTXG, CTXS, FTXS, CDXS, FDXS, FVXS Series

Trial operation procedure for CTXG, CTXS, FTXS, CDXS, FDXS, FVXS series.

4.2 FFQ Series

Trial operation procedure for FFQ series.

5. Field Settings

Describes how to configure system settings for installation.

5.1 Outdoor Unit

Field settings for the outdoor unit.

5.2 CTXG, CTXS, FTXS, CDXS, FDXS, FVXS Series

Field settings for CTXG, CTXS, FTXS, CDXS, FDXS, FVXS series.

5.3 FFQ Series

Field settings for FFQ series.

6. Silicone Grease on Power Transistor;Diode Bridge

Instructions for applying silicone grease during PCB replacement.

Part 8 Appendix

1. Piping Diagrams

Visual representations of refrigerant piping for indoor and outdoor units.

1.1 Indoor Unit

Refrigerant piping diagrams for indoor units.

1.2 Outdoor Unit

Refrigerant piping diagrams for outdoor units.

2. Wiring Diagrams

Electrical wiring diagrams for indoor and outdoor units.

2.1 Indoor Unit

Wiring diagrams for indoor unit electrical connections.

2.2 Outdoor Unit

Wiring diagrams for outdoor unit electrical connections.

3. Operation Limit

Defines the operating limits for cooling and heating modes.

Daikin 2MXL18QMVJU Specifications

General

Brand	Daikin
Model	2MXL18QMVJU
Category	Air Conditioner
Language	English