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Daikin Manuals
Air conditioning
FVXS50BVMA
Service manual
Daikin FVXS50BVMA Service Manual
Super multi nx c-series
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Contents
Table of Contents
Troubleshooting
Bookmarks
Table of Contents
Table of Contents
Introduction
Safety Cautions
Part 1 List of Functions
List of Functions
Cooling Only Models
Heat Pump Models
Part 2 Specifications
Specifications
Indoor Units - Cooling Only
Outdoor Units - Cooling Only
Indoor Units - Heat Pump
Outdoor Units - Heat Pump
Part 3 Printed Circuit Board Connector Wiring Diagram
Printed Circuit Board Connector Wiring Diagram
Wall Mounted Type 20/25/35 Class
Wall Mounted Type 50/60/71 Class
Duct Connected Type
Floor / Ceiling Suspended Dual Type
Floor Standing Type
Outdoor Units
Part 4 Function and Control
Main Functions
Frequency Principle
Power-Airflow Dual Flaps, Wide Angle Louvers and Auto-Swing
Fan Speed Control for Indoor Units
Programme Dry Function
Automatic Operation
Night Set Mode
Intelligent Eye
Home Leave Operation
Inverter Powerful Operation
Other Functions
Function of Main Structural Parts
Main Structural Parts
Function of Thermistor
Control Specification
Mode Hierarchy
Frequency Control
Controls at Mode Changing / Start-Up
Discharge Pipe Control
Input Current Control
Freeze-Up Protection Control
Heating Peak-Cut Control
Fan Control
Moisture Protection Function 2
Defrost Control
Low Hz High Pressure Limit
Electronic Expansion Valve Control
Malfunctions
Forced Operation Mode
Wiring-Error Check
Additional Function
Part 5 System Configuration
System Configuration
Operation Instructions
System Configuration Part
Instruction
Contents and Reference Page
Safety Precautions
Names of Parts
Preparation before Operation
AUTO · DRY · COOL · HEAT · FAN Operation
Adjusting the Air Flow Direction
POWERFUL Operation
OUTDOOR UNIT SILENT Operation
HOME LEAVE Operation
INTELLIGENT EYE Operation
TIMER Operation
Note for Multi System
Care and Cleaning
Troubleshooting
Part 6 Service Diagnosis
Caution for Diagnosis
Troubleshooting with the Operation Lamp
Problem Symptoms and Measures
Service Check Function
Code Indication on the Remote Controller
Error Codes and Description of Fault
Troubleshooting
Indoor Units
Outdoor Units
Indoor Unit PCB Abnormality
Freeze-Up Protection Control or High Pressure Control
Fan Motor or Related Abnormality
Thermistor or Related Abnormality (Indoor Unit)
Shutter Drive Motor / Shutter Limit Switch Abnormality
Signal Transmission Error (between Indoor and Outdoor Units)
Unspecified Voltage (between Indoor and Outdoor Units)
Freeze-Up Protection Control
OL Activation (Compressor Overload)
Compressor Lock
DC Fan Lock
Input over Current Detection
Four Way Valve Abnormality
Discharge Pipe Temperature Control
Position Sensor Abnormality
CT or Related Abnormality
Thermistor or Related Abnormality (Outdoor Unit)
Electrical Box Temperature Rise
Radiation Fin Temperature Rise
Output over Current Detection
Insufficient Gas
Low-Voltage Detection
Anti-Icing Function in Other Rooms / Unspecified Voltage (between Indoor and Outdoor Units)
Check
How to Check
Part 7 Removal Procedure
Outdoor Unit (80 / 90 Class)
Removal of Outer Panels
Removal of Propeller Fans
Removal of Electrical Box
Removal of PCB
Removal of Fan Motor
Removal of Electronic Expansion Valve and Thermistor
Removal of Sound Insulation and Reactor
Removal of Shunt
Removal of Solenoid Valve and Four Way Valve
Removal of Compressor
Outdoor Unit (50 / 52 / 58 / 68 / 75 Class)
Removal of Outer Panels
Removal of Electrical BOX
Removal of PCB
Removal of Fan Motor
Removal of Sound Insulation
Removal of Four Way Valve Coil, Solenoid Valve Coil
Electronic Expansion Valve Coil and Thermistor
Removal of Four Way Valve, Solenoid Valve and Shunt
Removal of Solenoid Valve and Shunt
Removal of Compressor
Part 8 Others
Others
Test Run from the Remote Controller
Jumper Settings
Part 9 Appendix
Piping Diagrams
Indoor Units
Outdoor Units
Wiring Diagrams
Indoor Units
Outdoor Units
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Table of Contents
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Introduction
3
Specifications
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Si12 - 411A
C-Series
[Applied Models]
Inverter Multi : Cooling Only
Inverter Multi : Heat Pump
Table of
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Table of Contents
Troubleshooting
Troubleshooting
170
Caution for Diagnosis
175
Troubleshooting
180
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Summarization of Contents
Part 1 List of Functions
1. List of Functions
Details the functions available for cooling-only models, categorized by system features.
1.1 Cooling Only Models
Details the functions available for cooling-only models, categorized by system features.
1.2 Heat Pump Models
Lists functions specific to heat pump models, covering operational capabilities.
Part 2 Specifications
1. Specifications
Provides detailed technical specifications for various cooling-only indoor units.
1.1 Indoor Units - Cooling Only
Provides detailed technical specifications for various cooling-only indoor units.
1.2 Outdoor Units - Cooling Only
Outlines technical specifications for cooling-only outdoor units, including capacity and dimensions.
1.3 Indoor Units - Heat Pump
Detailed technical specifications for indoor units designed for heat pump operation.
1.4 Outdoor Units - Heat Pump
Technical specifications for outdoor units supporting heat pump functionality.
Part 3 Printed Circuit Board Connector Wiring Diagram
1. Printed Circuit Board Connector Wiring Diagram
Wiring diagram details for wall-mounted indoor units of the 20/25/35 class.
1.1 Wall Mounted Type 20/25/35 Class
Wiring diagram details for wall-mounted indoor units of the 20/25/35 class.
1.2 Wall Mounted Type 50/60/71 Class
Wiring diagram for wall-mounted indoor units of the 50/60/71 class.
1.5 Floor Standing Type
Wiring diagrams specific to floor-standing indoor unit models.
1.6 Outdoor Units
Wiring diagrams for various outdoor units.
Part 4 Function and Control
1. Main Functions
Explains how compressor frequency is controlled for capacity regulation.
1.1 Frequency Principle
Explains how compressor frequency is controlled for capacity regulation.
1.3 Fan Speed Control for Indoor Units
Details how indoor unit fan speed is automatically adjusted based on temperature differences.
1.7 Intelligent Eye
Describes the sensor function that detects human presence for energy saving.
1.8 Home Leave Operation
Explains the function to set preferred temperature and airflow for immediate heating/cooling.
3. Control Specification
Outlines how compressor frequency is determined based on room temperature and capacity.
3.2 Frequency Control
Outlines how compressor frequency is determined based on room temperature and capacity.
3.12 Electronic Expansion Valve Control
Details various controls managed by the electronic expansion valve.
3.15 Wiring-Error Check
Describes the function to automatically correct wiring errors in the system.
Part 5 System Configuration
1. System Configuration
Guidance on operating and handling the air conditioner after installation and testing.
1.1 Operation Instructions
Guidance on operating and handling the air conditioner after installation and testing.
2. Instruction
Essential safety guidelines and warnings for handling the air conditioner.
2.2 Safety Precautions
Essential safety guidelines and warnings for handling the air conditioner.
2.3 Names of Parts
Identifies and labels the key components of the indoor and outdoor units.
2.5 AUTO · DRY · COOL · HEAT · FAN Operation
Instructions on selecting and using different operating modes of the air conditioner.
2.14 Troubleshooting
Lists common problems and their solutions for the air conditioner system.
Part 6 Service Diagnosis
1. Caution for Diagnosis
Guidance on interpreting the operation lamp for troubleshooting basic issues.
1.1 Troubleshooting with the Operation Lamp
Guidance on interpreting the operation lamp for troubleshooting basic issues.
2. Problem Symptoms and Measures
A comprehensive guide to identifying and resolving common operational problems.
5. Troubleshooting
Detailed troubleshooting steps for issues related to indoor units.
5.1 Indoor Units
Detailed troubleshooting steps for issues related to indoor units.
5.2 Outdoor Units
Troubleshooting procedures for problems occurring in the outdoor unit.
5.3 Indoor Unit PCB Abnormality
Steps to diagnose and resolve issues related to the indoor unit's PCB.
5.4 Freeze-up Protection Control or High Pressure Control
Troubleshooting for freeze-up protection or high-pressure control activation.
5.5 Fan Motor or Related Abnormality
Diagnosing and resolving problems with the fan motor or its related components.
5.6 Thermistor or Related Abnormality (Indoor Unit)
Troubleshooting for abnormalities with indoor unit thermistors.
5.18 CT or Related Abnormality
Diagnosing issues related to the Current Transformer (CT) or its associated components.
5.23 Insufficient Gas
Troubleshooting steps for identifying and resolving refrigerant gas shortages.
6. Check
Procedures for checking fan motor connector output and related voltages.
6.1.1 Fan Motor Connector Output Check
Procedures for checking fan motor connector output and related voltages.
6.1.3 Electronic Expansion Valve Check
Steps for checking the performance and functionality of the electronic expansion valve.
6.1.5 Thermistor Resistance Check
Guidance on measuring thermistor resistance to diagnose faults.
Part 7 Removal Procedure
1. Outdoor Unit (80 / 90 Class)
Step-by-step instructions for removing the outer panels of the 80/90 class outdoor unit.
1.1 Removal of Outer Panels
Step-by-step instructions for removing the outer panels of the 80/90 class outdoor unit.
1.3 Removal of Electrical Box
Procedure for safely removing the electrical box from the outdoor unit.
1.4 Removal of PCB
Detailed steps for removing the Printed Circuit Board (PCB).
1.5 Removal of Fan Motor
Instructions for removing the outdoor unit fan motor.
1.10 Removal of Compressor
Procedure for safely removing the compressor from the outdoor unit.
2. Outdoor Unit (50 / 52 / 58 / 68 / 75 Class)
Steps for removing the outer panels of the 50-75 class outdoor unit.
2.1 Removal of Outer Panels
Steps for removing the outer panels of the 50-75 class outdoor unit.
2.3 Removal of PCB
Instructions for removing the PCB from the 50-75 class outdoor unit.
2.4 Removal of Fan Motor
Procedure for removing the fan motor from the 50-75 class outdoor unit.
2.6 Removal of Four Way Valve Coil, Solenoid Valve Coil, Electronic Expansion Valve Coil and Thermistor
Detailed steps for removing coils and thermistors from the outdoor unit.
2.9 Removal of Compressor
Instructions for removing the compressor from the 50-75 class outdoor unit.
Part 8 Others
1.1 Test Run from the Remote Controller
Guidance on performing a test run of the air conditioner using the remote controller.
1.2 Jumper Settings
Information on configuring jumper settings for specific operational modes or configurations.
Part 9 Appendix
1. Piping Diagrams
Diagrams illustrating the refrigerant piping for various indoor unit models.
1.1 Indoor Units
Diagrams illustrating the refrigerant piping for various indoor unit models.
1.2 Outdoor Units
Piping diagrams showing the refrigerant flow for different outdoor unit models.
2. Wiring Diagrams
Electrical wiring diagrams for various indoor unit models.
2.1 Indoor Units
Electrical wiring diagrams for various indoor unit models.
2.2 Outdoor Units
Electrical wiring diagrams for various outdoor unit models.
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