Why is the compressor running but not cooling when using the Qunda QD80C (QD82+) universal control card with an LG model Q096WEA4 (Compressor GA092MCA)?

If your compressor (LG GA092MCA) is running but the system is not cooling, there are several potential causes related to the installation of the Qunda QD80C/QD82+ universal control system:DIP Switch Configuration: You mentioned that the "Gear" (DIP switches) for DC 1234 are all in the OFF state. These switches typically define the compressor's operating frequency and power parameters. If they are set incorrectly for your specific 893W LG compressor, the inverter may not be driving the compressor at a high enough speed to compress the refrigerant effectively. Consult the physical wiring diagram or manual included with the kit to verify the correct switch positions for a 9000-12000 BTU DC compressor.Refrigerant Levels: If the compressor is physically vibrating/running but there is no temperature change, the system may have lost its refrigerant charge during the board swap, or the Electronic Expansion Valve (EEV) may not be opening. Ensure the EEV is correctly connected to the new QD82+ board.Wiring Phase: Ensure the 3-phase (U, V, W) connections to the DC compressor are secure. If the compressor is running backward or inefficiently due to incorrect phasing, it will not cool properly.Sensor Placement: Ensure the pipe temperature sensor and ambient temperature sensor are correctly installed. If the board receives incorrect data, it may keep the compressor in a low-frequency "idling" state.Note: Because this involves high-voltage DC components (up to 280V as per your compressor specs), troubleshooting should be performed by a qualified technician. If the compressor is running but "not to touch" (meaning it is not getting cold/hot as expected), it is likely a configuration or refrigerant flow issue.

How do I set up the iHandy QD82+ Qunda Universal DC Inverter Control System if the outdoor PCB is not working and the compressor is not running fast?

To set up the iHandy QD82+ Qunda Universal DC Inverter Control System and troubleshoot a compressor that is not running at full speed, follow these steps:Verify Wiring: Ensure the compressor is correctly wired to the appropriate terminals on the QD82+ main control board. Incorrect wiring is a common cause for the compressor failing to start or run correctly.Check the Power Module: Ensure the Power Module (Capacitor Board) is securely connected to the main control board via the provided communication cable. This module houses the capacitors essential for inverter operation.Sensor Placement: Verify that all temperature sensors are connected to their respective ports. A faulty or misplaced sensor can cause the system to limit compressor speed.Refrigerant Levels: If the PCB and wiring are correct but the compressor still performs poorly, the issue may be low refrigerant. You should consult a qualified HVAC technician to check gas levels.Electronic Expansion Valve (EEV): Ensure the EEV is properly connected to the main board, as this regulates the flow that allows the compressor to reach its required speed.Safety Warning: Installation and internal troubleshooting should only be performed by qualified personnel. Always disconnect the main power supply at the circuit breaker before touching the PCB or wiring.

iHandy QD82+

QD82+ Qunda Universal DC Inverter Control System User Manual

For 6000-12000BTU Split Air Conditioners

1. Product Overview

The QD82+ Qunda Universal DC Inverter Control System is designed to replace faulty control systems in 6000-12000BTU split air conditioning units. This system provides a comprehensive solution for managing the DC inverter compressor, outdoor and indoor fan motors, and electronic expansion valve, restoring full functionality to your AC unit.

Complete QD82+ Qunda Universal DC Inverter Control System components including main board, power module, remote control, and sensors.

Figure 1: Overview of the QD82+ system components. This includes the main control board, power module, remote control, and various connecting cables and sensors.

Key Features:

Universal compatibility with 6000-12000BTU split AC units.
Drives strong DC/AC compressors.
Controls outdoor DC/AC fan motors.
Manages indoor DC/PG fan motors.
Drives electronic expansion valves.
Includes a user-friendly remote control for operation.

2. Package Contents

Verify that all components listed below are present in your package before proceeding with installation.

1 x QD82+ Main Control Board
1 x Power Module (Capacitor Board)
1 x Remote Control
1 x Display Panel with Cable
Various connecting cables and sensors (e.g., temperature sensors, communication cables)

Close-up view of the QD82+ main control board and power module.

Figure 2: Detailed view of the main control board and the separate power module, which houses large capacitors essential for inverter operation.

3. Setup and Installation

Important Safety Information: Installation should only be performed by qualified personnel. Disconnect power to the AC unit before beginning any installation work. Failure to do so may result in electric shock, injury, or damage to the equipment.

Power Disconnection: Ensure the main power supply to the air conditioning unit is completely disconnected at the circuit breaker. Verify with a voltage tester.
Access Existing Control System: Carefully open the outdoor unit casing to gain access to the existing inverter control board. Note the wiring connections before removal. Taking photos of the original setup is highly recommended.
Remove Old System: Disconnect all wires and mounting screws from the old control board and power module. Remove them from the unit.
Install New QD82+ System:
- Mount the QD82+ Main Control Board and Power Module in the designated locations within the outdoor unit. Ensure they are securely fastened to prevent vibration.
- Connect the power module to the main control board using the provided communication cable.
- Connect the compressor, outdoor fan motor, and electronic expansion valve wiring to the appropriate terminals on the QD82+ main control board. Refer to the wiring diagram (if provided with the physical product) or the original unit's service manual for specific terminal identification.
- Connect the indoor unit communication cable to the designated port on the QD82+ main control board.
- Install the new display panel and connect its cable to the main board.
- Connect all temperature sensors to their respective ports.
Secure Wiring: Ensure all connections are firm and properly insulated. Use cable ties to secure wiring and prevent interference with moving parts.
Close Casing: Carefully close and secure the outdoor unit casing.
Restore Power: Reconnect the main power supply to the air conditioning unit.

Detailed view of the QD82+ main control board with various connection points and components.

Figure 3: Close-up of the QD82+ main control board, highlighting the various input/output terminals and integrated circuits. Proper connection to these points is crucial for system functionality.

4. Operating Instructions

Once installed, the QD82+ system operates seamlessly with your existing indoor unit and remote control. Use the provided remote control for all operational commands.

Remote Control Functions:

Image showing the QD82+ system components including the remote control, display, and various cables.

Figure 4: The remote control and display unit included with the QD82+ system, used for setting operational modes and temperature.

Power On/Off: Press the ON/OFF button to turn the AC unit on or off.
Mode Selection: Use the MODE button to cycle through operating modes (e.g., Cool, Heat, Fan, Dry, Auto).
Temperature Adjustment: Use the TEMP ▲ and TEMP ▼ buttons to increase or decrease the desired temperature.
Fan Speed: Press the FAN button to adjust fan speed (e.g., Low, Medium, High, Auto).
Timer Function: Set the timer for automatic power on/off using the TIMER ON and TIMER OFF buttons.
Sleep Mode: Activate sleep mode for quiet operation and energy saving using the SLEEP button.

For detailed instructions on specific remote control functions, refer to the remote control's dedicated user guide (if applicable) or the original AC unit's manual.

5. Maintenance

The QD82+ system itself requires minimal maintenance. However, regular maintenance of the overall air conditioning unit is crucial for optimal performance and longevity.

Filter Cleaning: Regularly clean or replace the indoor unit's air filters (monthly or as needed) to ensure proper airflow and efficiency.
Outdoor Unit Cleaning: Periodically clean the outdoor coil and remove any debris (leaves, dirt) that may obstruct airflow. Ensure power is disconnected before cleaning.
Professional Inspection: It is recommended to have a qualified HVAC technician inspect your AC unit annually to check refrigerant levels, electrical connections, and overall system health.

6. Troubleshooting

This section provides solutions to common issues you might encounter after installing the QD82+ system. If the problem persists, contact a qualified technician.

Problem	Possible Cause	Solution
AC unit does not power on.	No power supply; incorrect wiring; faulty remote control.	Check circuit breaker. Verify all power connections to the QD82+ board. Replace remote control batteries.
Compressor not starting.	Incorrect compressor wiring; low refrigerant; faulty sensor.	Re-check compressor wiring connections. Consult a technician for refrigerant levels or sensor diagnostics.
Fan motor not operating.	Incorrect fan motor wiring; faulty fan motor.	Verify fan motor connections to the QD82+ board. Test fan motor if possible.
System not cooling/heating effectively.	Incorrect temperature setting; dirty filters; low refrigerant; electronic expansion valve issue.	Adjust temperature setting. Clean/replace air filters. Contact technician for refrigerant or expansion valve issues.
Error code displayed.	Sensor malfunction; communication error; system fault.	Note the error code and consult the original AC unit's service manual or contact a technician for diagnosis.

7. Specifications

Model: QD82+
Compatibility: Universal for 6000-12000BTU Split Air Conditioners
Supported Motors: DC/AC Compressor, Outdoor DC/AC Fan Motor, Indoor DC/PG Fan Motor
Control: Electronic Expansion Valve
Power Source Type: Battery Powered (for remote control)
Manufacturer: QUNDA
Brand: iHandy

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