STC-8080A Temperature Controller User Manual

1. Product Overview

The Finglai STC-8080A+ is a microcomputer temperature controller designed for industrial applications, offering precise temperature management for cooling and defrosting systems. It features a digital display for easy monitoring and intuitive buttons for setting parameters. This manual provides detailed instructions for installation, operation, and maintenance to ensure optimal performance and longevity of your device.

2. Package Contents

Upon opening the package, please verify that all items are present and in good condition:

• 1 x STC-8080A+ Temperature Controller
• 1 x Temperature Sensor
• 1 x User Manual

3. Specifications

4. Safety Information

Please read and understand the following safety precautions before installation and operation:

• All electrical wiring should be performed by a qualified electrician in accordance with local electrical codes.
• Ensure the power supply is disconnected before making any wiring connections to prevent electric shock.
• Verify that the supply voltage matches the specifications of your STC-8080A+ model (e.g., 220VAC, 110VAC, or 12/24VAC/DC). Incorrect voltage can damage the device.
• Distinguish clearly between the relay, sensor, and power interfaces during wiring.
• Keep the temperature sensor wire and power supply wires separated to avoid interference and ensure accurate readings.
• Do not operate the device in environments exceeding its specified temperature and humidity limits.

5. Installation and Wiring

The STC-8080A+ is designed for panel mounting. Ensure adequate ventilation around the unit. Refer to the wiring diagram below for correct electrical connections.

5.1 Wiring Diagram Explanation

The rear panel of the controller features terminals for various connections:

• Terminals 1 & 2: Compressor output (Rated 10A/220VAC). Connect your cooling compressor here.
• Terminals 3 & 4: Co-point. These are common terminals for the relays.
• Terminals 5 & 6: Defrost output (Rated 10A/220VAC). Connect your defrost heater or device here.
• Terminals 7 & 8: Storage Sensor input. Connect the provided temperature sensor here.
• Terminals 9, 10 & 11: Power Supply (e.g., 220VAC). Connect your main power input here.

5.2 Installation Cautions

• Distinguish Interfaces: Carefully identify and connect the correct wires to the relay, sensor, and power terminals. Miswiring can cause damage or malfunction.
• Wire Separation: Maintain a proper distance between the sensor wire and the power supply wires to prevent electrical noise interference, which could affect temperature reading accuracy.
• Voltage Check: Before applying power, double-check that the supply voltage matches the voltage rating of your specific STC-8080A+ unit.

6. Operation

6.1 Control Panel

The front panel features a digital display and four buttons:

• Set: Used to enter and exit parameter setting mode.
• Up (▲): Used to increase values or navigate menu options.
• Down (▼): Used to decrease values or navigate menu options.
• Rst: Used for reset functions.

6.2 Indicator Lights

• Defr (Defrost): Illuminates when the defrost cycle is active.
• Cool (Cooling): Illuminates when the compressor (cooling) is active.
• Set (Setting): Illuminates when the device is in parameter setting mode.

6.3 Basic Functions

• Temperature Display: The main digital display shows the current measured temperature.
• Cooling Control: The compressor will start when the measured temperature is greater than or equal to the set temperature. It will stop when the measured temperature is less than or equal to the set temperature.
• Defrost Control: The defrost cycle initiates when the programmed defrost time is reached. It terminates when the defrost temperature setpoint is achieved.

7. Parameter Settings

To access and modify the controller's parameters, follow these steps:

1. Press and hold the 'Set' button for approximately 3 seconds until the 'Set' indicator lights up and the display shows 'F1'. This indicates you have entered the parameter setting mode.
2. Use the 'Up' (▲) or 'Down' (▼) buttons to navigate through the parameter codes (F1, F2, F3, F4).
3. Once the desired parameter code is displayed, press the 'Set' button briefly to view its current value.
4. Use the 'Up' (▲) or 'Down' (▼) buttons to adjust the value.
5. Press the 'Set' button again to confirm the new value and return to the parameter code display.
6. To exit the parameter setting mode, press and hold the 'Set' button for 3 seconds, or the controller will automatically exit after a period of inactivity.

7.1 Menu Instruction Table

8. Troubleshooting

If you encounter issues with your STC-8080A+ controller, refer to the following common problems and solutions:

• No Power/Display Off:
  • Check the power supply connections (Terminals 9, 10, 11) and ensure they are secure and receiving the correct voltage.
  • Verify the power source is active.
• Incorrect Temperature Reading:
  • Ensure the temperature sensor is correctly connected to Terminals 7 & 8.
  • Check if the sensor wire is damaged or if there's interference from power lines.
  • Use the F3 parameter to calibrate the temperature if a known offset exists.
• Compressor/Defrost Not Activating:
  • Check the wiring to the compressor (Terminals 1 & 2) and defrost unit (Terminals 5 & 6).
  • Verify that the temperature control (F1) and defrost (F2) parameters are set correctly according to your desired operation.
  • Ensure the current measured temperature is within the range that should trigger the compressor or defrost cycle.
• Buttons Unresponsive:
  • Ensure the device is not in a locked state (if applicable, though not specified for this model).
  • Try a soft reset by briefly pressing the 'Rst' button.

9. User Tips

• Verify Voltage: The STC-8080A+ is available in multiple voltage configurations (220VAC, 110VAC, 12/24VAC/DC). Always double-check the label on your specific unit and ensure your power supply matches to prevent damage.
• Sensor Placement: For accurate temperature control, place the temperature sensor in a location that provides a true representation of the environment you wish to control, away from direct airflow or heat sources that might skew readings.
• Parameter Backup: Before making significant changes to the parameters, it's advisable to note down the default or previous settings in case you need to revert them.

10. Warranty and Support

Finglai Electric provides quality products. For any technical assistance or warranty inquiries, please contact your point of purchase or the manufacturer directly. Keep your purchase receipt as proof of purchase.