Daikin RXS20L2V1B User Manual

Service
Manual
[Applicable Models]
z Inverter Pair: Heat Pump
Inverter Pair
Wall Mounted Type FTXS/ATXS-K Series
SiBE041134EB

Daikin RXS20L2V1B Specifications

General

Cooling Capacity	2.0 kW
Heating Capacity	2.5 kW
Weight (Indoor Unit)	9 kg
Power Supply	220-240 V, 50 Hz
Refrigerant	R32
Indoor Unit Noise Level	19 dB

Summary

1. Safety Cautions

1.1 Warnings and Cautions Regarding Safety of Workers

Safety guidelines for personnel involved in installation and repair.

1.2 Warnings and Cautions Regarding Safety of Users

Safety guidelines for end-users to prevent operational hazards.

Part 2 Specifications

1. Specifications

Detailed technical specifications for the equipment models.

Part 4 Functions and Control

1.2 Frequency Principle

3. Control Specification

3.2 Frequency Control

Detailed explanation of compressor frequency regulation.

3.4 Discharge Pipe Temperature Control

3.5 Input Current Control

3.6 Freeze-up Protection Control

3.7 Heating Peak-cut Control

3.10 Defrost Control

3.11 Electronic Expansion Valve Control

3.12 Malfunctions

Lists and describes system malfunctions and error codes.

Part 6 Service Diagnosis

1. General Problem Symptoms and Check Items

Common problems, check items, and reference pages for troubleshooting.

2. Troubleshooting with LED

Interpreting error codes indicated by LED lights on indoor/outdoor units.

2.1 Indoor Unit

2.2 Outdoor Unit

4. Troubleshooting

Detailed troubleshooting steps for various error codes.

4.1 Error Codes and Description

A comprehensive list of error codes and their meanings.

4.2 Indoor Unit PCB Abnormality

Troubleshooting steps for indoor unit PCB issues.

4.3 Freeze-up Protection Control / Heating Peak-cut Control

Troubleshooting for freeze-up or peak-cut errors.

4.4 Fan Motor (DC Motor) or Related Abnormality

Troubleshooting for indoor fan motor malfunctions.

4.5 Thermistor or Related Abnormality (Indoor Unit)

Troubleshooting for indoor thermistor errors.

4.6 Refrigerant Shortage

Diagnosing and resolving refrigerant shortage issues.

4.7 Low-voltage Detection or Over-voltage Detection

Troubleshooting voltage supply issues.

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

Diagnosing communication errors between units.

4.9 Unspecified Voltage (Between Indoor Unit and Outdoor Unit)

Troubleshooting voltage mismatch errors.

4.10 Outdoor Unit PCB Abnormality

Troubleshooting for outdoor unit PCB failures.

4.11 OL Activation (Compressor Overload)

Troubleshooting compressor overload conditions.

4.12 Compressor Lock

Diagnosing and resolving compressor lock issues.

4.13 DC Fan Lock

Troubleshooting for DC fan motor lock errors.

4.14 Input Overcurrent Detection

Troubleshooting input overcurrent errors.

4.15 Four Way Valve Abnormality

Diagnosing and fixing four-way valve issues.

4.16 Discharge Pipe Temperature Control

Troubleshooting discharge pipe temperature errors.

4.17 High Pressure Control in Cooling

Troubleshooting high pressure issues during cooling.

4.18 Compressor System Sensor Abnormality

Diagnosing compressor system sensor faults.

4.19 Position Sensor Abnormality

4.20 DC Voltage / Current Sensor Abnormality

4.21 Thermistor or Related Abnormality (Outdoor Unit)

4.22 Electrical Box Temperature Rise

4.23 Radiation Fin Temperature Rise

4.24 Output Overcurrent Detection

5. Check

5.1 Thermistor Resistance Check

5.2 Indoor Fan Motor Connector Output Check

5.3 Power Supply Waveforms Check

5.4 Electronic Expansion Valve Check

5.5 Four Way Valve Performance Check

5.6 Inverter Unit Refrigerant System Check

5.7 Inverter Analyzer Check

5.8 Rotation Pulse Check on the Outdoor Unit PCB

5.9 Installation Condition Check

5.10 Discharge Pressure Check

5.11 Outdoor Fan System Check

5.12 Main Circuit Short Check

5.13 Power Module Check