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Daikin FTKB18AXVJU User Manual

Daikin FTKB18AXVJU
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SERVICE MANUAL
Inverter Wall Mounted Single Split
dd
SM-5WM-Y-NA-B1
MODELS
Cooling Only
FTKB09AXVJU RKB09AXVJU
FTKB12AXVJU RKB12AXVJU
FTKB18AXVJU RKB18AXVJU
FTKB24AXVJU RKB24AXVJU
FTKN09AXVJU RKN09AXVJU
FTKN12AXVJU RKN12AXVJU
FTKN18AXVJU RKN18AXVJU
FTKN24AXVJU RKN24AXVJU
Heatpump
FTXB09AXVJU RXB09AXVJU
FTXB12AXVJU RXB12AXVJU
FTXB18AXVJU RXB18AXVJU
FTXB24AXVJU RXB24AXVJU
FTXN09AXVJU RXN09AXVJU
FTXN12AXVJU RXN12AXVJU
FTXN18AXVJU RXN18AXVJU
FTXN24AXVJU RXN24AXVJU
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Daikin FTKB18AXVJU Specifications

General IconGeneral
BrandDaikin
ModelFTKB18AXVJU
CategoryAir Conditioner
LanguageEnglish

Summary

Safety Cautions

Pictograms and Warnings

Explanation of safety pictograms and warning categories used in the manual.

Repair Safety Precautions

Detailed safety warnings and precautions to be followed during repair work.

Post-Repair Cautions

Inspection After Repair

Checks to be performed after repair work is completed to ensure safety and proper function.

Piping Specifications

Function and Control

Temperature Control Mechanism

How the unit detects and controls room temperature using thermistors and set points.

Operating Modes

Cooling Mode Operation

Details on compressor and fan operation during cooling mode based on temperature differences.

Heating Mode Operation

Details on compressor and fan operation during heating mode based on temperature differences.

Specific Operating Modes

Performance Functions

Indoor-Outdoor Communication

Details on signal transmission and error detection between indoor and outdoor units.

Thermistors and Their Functions

Component Control

Four Way Valve Control

Operation of the four-way valve during different modes like cooling, heating, and defrost.

Compressor Rotation Control

Starting Rotation Control

Gradual compressor startup to prevent oil discharge and limit starting current.

Rotation Limits and Defrost

Limit Rotation Control

Compressor rotation control within 5 zones (stop, drop, keep, up, reset) based on conditions.

Defrost Cycle Operation

How the defrost cycle is initiated and terminated using reverse cycle operation.

Protection Mechanisms

Indoor Coil Freeze Prevention

Protection against ice formation on the indoor coil by reducing compressor frequency.

High Pressure Protection

Mechanism to prevent high pressure by adjusting compressor frequency based on coil temperature.

Temperature and Current Monitoring

Discharge Pipe Temperature Control

Controls compressor frequency to manage discharge pipe temperature for internal protection.

Overall Current Control

Monitors overall current to restrict compressor rotation and prevent circuit breaker overload.

Overall Frequency Control Logic

Service Diagnosis

Indoor Unit Error Indicators

LED indicators on the indoor unit and their meaning during operation or fault.

Indoor Unit Error Indicators (FTK(X)B)

LED indicators and fault indications for FTK(X)B series indoor units.

Error Code Retrieval

Procedure to retrieve error codes using BRC52A and BRC52B remote controllers.

Inverter Error Code Descriptions

List of error codes and their descriptions for inverter models.

Wiring Connections

Refrigerant Diagrams

Power Supply Waveform Checks

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