1. Introduction
This manual provides detailed instructions for the installation, operation, and maintenance of the QUNDA Universal AC Air Conditioner Control System, model QD-U03C+. This system is designed to replace or upgrade the control board in various air conditioning units, offering enhanced functionality and reliable performance. Please read this manual thoroughly before installation and use to ensure proper operation and safety.
2. Safety Information
WARNING: Electrical installation should only be performed by a certified technician.
- Always disconnect power to the air conditioner unit before attempting any installation or maintenance.
- Ensure all wiring connections are secure and correctly matched to prevent electrical hazards or damage to the unit.
- This product is designed for standard AC units and does not apply to inverter A.C. systems.
- Avoid exposing the IR receiver to strong direct light, as this may interfere with remote control operation.
- Test the system thoroughly after installation before resuming normal operation.
3. Package Contents
Verify that all items listed below are included in your package:
- Main Control PCB (QD-U03C+)
- Remote Control
- Display Unit
- Transformer
- Temperature Sensor
- Wiring Harnesses (various)
4. Specifications
| Feature | Description |
|---|---|
| Model Number | QD-U03C+ |
| DIY Supplies Category | Electrical |
| Origin | Mainland China |
| Certification | None |
| Fan Speeds | 3 |
| Working Modes | 5 (Cool, Heat, Fan, Dry, Auto) |
| Special Functions | Sleep function, Auto defrost, Auto-restart, Prevents cold air in heating mode, Accurate & stable temperature control, Timer on/off, Outdoor fan independent control, Deluxe receiver with visual work status display. |
| Package Dimensions (L x W x H) | 25 cm x 18 cm x 10 cm |
| Package Weight | 0.85 kg |
5. Installation
Installation of the QD-U03C+ control system requires electrical knowledge and should be performed by a certified technician. Follow these general guidelines:
- Disconnect Power: Before beginning, ensure the main power supply to the air conditioner unit is completely disconnected.
- Remove Old Control Board: Carefully remove the existing control board from your AC unit. Document all connections before removal.
- Mount New Control Board: Install the QD-U03C+ main PCB in a suitable location within the AC unit, ensuring it is secure and protected from moisture.
- Wiring Connections: Refer to the wiring diagram below for correct connections. Pay close attention to the labels on the PCB and the corresponding components of your AC unit.
Figure 5.1: QD-U03C+ Wiring Diagram Important Wiring Notes:
- The common pins of the swing socket are 12V output. If the step motor direction is incorrect, exchange the common pins of the swing socket. If still incorrect, exchange the common pins of the step motor to other common pins of the swing socket.
- Ensure the transformer is connected using the fast plug for convenience.
Figure 5.2: Transformer - Connect the temperature sensor to the designated port on the PCB.
Figure 5.3: Temperature Sensor - Connect the display unit to the 'DISPLAY' port on the PCB.
Figure 5.4: Remote Control and Display Unit
- Initial Test: After all connections are made, carefully restore power and perform an initial test of all functions using the remote control.
6. Operating Instructions
The QD-U03C+ system is operated using the included remote control and the display unit. The display unit provides visual feedback on the current operating status.
6.1 Remote Control Functions
The remote control allows you to access all features of the QD-U03C+ system. Common functions include:
- Power ON/OFF: Turns the AC unit on or off.
- Mode Selection: Cycle through the 5 working modes: Cool, Heat, Fan, Dry, Auto.
- Temperature Adjustment: Increase or decrease the desired temperature.
- Fan Speed: Select between 3 fan speeds (Low, Medium, High).
- Sleep Function: Activates a mode designed for comfortable sleep, often adjusting temperature gradually.
- Timer ON/OFF: Set a timer for the unit to turn on or off automatically.
- Swing Function: Controls the louver swing for air distribution.
6.2 Display Unit
The display unit provides real-time information such as current temperature, selected mode, fan speed, and timer settings. Its deluxe design offers clear visual feedback on the system's work status.
7. Maintenance
To ensure the longevity and optimal performance of your QD-U03C+ control system and the AC unit it controls, follow these maintenance tips:
- Regular Cleaning: Keep the display unit and remote control clean and free from dust. Use a soft, dry cloth.
- Battery Replacement: Replace the remote control batteries periodically or when the remote's range decreases.
- IR Receiver: Ensure the IR receiver on the display unit is unobstructed and clean for reliable remote control communication.
- Professional Inspection: It is recommended to have the entire AC unit, including the control system, inspected by a certified technician annually.
8. Troubleshooting
If you encounter issues with your QD-U03C+ control system, refer to the table below for common problems and solutions.
| Problem | Possible Cause | Solution |
|---|---|---|
| System does not power on. | No power supply; incorrect wiring; blown fuse. | Check main power to AC unit. Verify all wiring connections. Inspect the fuse on the PCB (Figure 8.1) and replace if necessary. |
| Remote control not responding. | Dead batteries; obstructed IR receiver; strong light interference. | Replace remote batteries. Ensure no objects block the IR receiver. Relocate the unit or block strong light sources if interfering. |
| Incorrect fan speed or mode operation. | Incorrect settings; wiring issue to fan motor. | Verify settings on remote/display. Check wiring to fan motors. |
| Swing motor direction is wrong. | Incorrect swing motor wiring. | Exchange the common pins of the swing socket. If still incorrect, exchange the common pins of the step motor to other common pins of the swing socket. |
| AC unit not cooling/heating effectively. | Temperature sensor issue; refrigerant levels; other AC unit problems. | Check temperature sensor connection. This may indicate a problem with the AC unit itself, consult an AC technician. |
9. User Tips
- For optimal performance, ensure the temperature sensor is placed in a location that accurately reflects the room temperature and is not exposed to direct drafts or heat sources.
- Utilize the "Sleep function" for energy savings and enhanced comfort during nighttime hours.
- The "Auto-restart function" is useful in areas prone to power outages, as the unit will resume its previous settings once power is restored.
- Regularly check for firmware updates if available from the manufacturer to ensure your system has the latest features and bug fixes (check manufacturer's website).
10. Warranty and Support
For warranty information, technical support, or service inquiries, please contact your retailer or the manufacturer directly. Keep your purchase receipt as proof of purchase.
Brand: ZUIDID
Model: QD-U03C+
