Daikin SkyAir SkyAir FHQ42MVJU User Manual

Service
Manual
RZR-P, RZQ-P(9) Series
Cooling Only / Heat Pump
R-410A 60Hz
SiUS28-902_B

Daikin SkyAir SkyAir FHQ42MVJU Specifications

General

Model	FHQ42MVJU
Category	Air Conditioner
Power Supply	220-240 V / 50 Hz / 1 Phase
Refrigerant	R32
Airflow Rate	10.2 m³/min
Air Flow (Indoor Unit)	10.2 m³/min

Summary

Part 2 Refrigerant Circuit

1. Refrigerant Circuit

1.1 RZR18 / 24 / 30PVJU RZQ18 / 24 / 30PVJU(9)

1.2 RZR36 / 42PVJU RZQ36 / 42PVJU(9)

Part 3 Function

2. Basic Control

2.1 Normal Operation

2.2 Compressor PI Control

2.3 Electronic Expansion Valve PI Control

3. Special Control

3.1 Startup Control

3.2 Oil Return Operation

3.3 Defrosting Operation

3.4 Pump Down Residual Operation

4. Protection Control

Outlines the system's protection against high pressure.

4.1 High Pressure Protection Control

Outlines the system's protection against high pressure.

4.2 Low Pressure Protection Control

Details the system's protection against low pressure.

4.3 Discharge Pipe Protection Control

Explains protection for the discharge pipe temperature.

4.4 Inverter Protection Control

Describes protection mechanisms for the inverter.

6. Outline of Control (Indoor Unit)

6.1 Drain Pump Control

6.3 Room Temperature Thermistor in Remote Controller

6.4 Freeze-up Prevention

6.6 Hot Start Control (In Heating Operation Only)

6.7 Heater Control (Only for FTQ)

6.8 4 Step Thermostat Processing (Only for FTQ)

Part 4 Test Operation

1. Test Operation

Step-by-step guide for initial test operations after installation.

1.1 Procedure and Outline

Step-by-step guide for initial test operations after installation.

1.2 Operation when Power is Turned ON

2. Outdoor Unit PCB Layout

3. Field Setting

Guides on setting unit functions via remote controller.

3.1 Field Setting from Remote Controller

Guides on setting unit functions via remote controller.

3.2 Field Setting from Remote Controller (Indoor Unit)

Details field setting configurations for indoor units.

3.3 Field Setting from Outdoor Unit

Explains how to configure settings using outdoor unit switches.

3.4 Detail of Setting Mode

Part 5 Service Diagnosis

1. Symptom-based Troubleshooting

Provides troubleshooting steps based on system symptoms.

2. Troubleshooting by Remote Controller

Explains how to use the inspection/test button for diagnostics.

2.1 The INSPECTION / TEST Button

Explains how to use the inspection/test button for diagnostics.

2.6 Error Codes and Description

Lists error codes and their descriptions for troubleshooting.

3. Troubleshooting by Indication on the Remote Controller

Troubleshooting steps for external protection device issues.

3.1 External Protection Device Abnormality

Troubleshooting steps for external protection device issues.

3.2 PCB Abnormality

Guides on diagnosing and resolving PCB abnormalities.

3.15 High Pressure Abnormality

Diagnosing and resolving high pressure issues.

3.16 Actuation of Low Pressure Sensor

Troubleshooting steps for low pressure sensor issues.

3.37 Refrigerant Shortage

Troubleshooting steps for refrigerant shortage issues.

3.40 Transmission Error (between Indoor Units and Outdoor Units)

Diagnosing transmission errors between indoor/outdoor units.

Part 6 Appendix

2. Wiring Diagrams for Reference

2.1 Outdoor Unit

2.2 Indoor Unit

3. Thermistor Resistance / Temperature Characteristics

4. Pressure Sensor

5.2 Service Tools