1. Product Overview
The Walfront STC-3028 is a microcomputer intelligent digital display thermostat designed for precise temperature and humidity control. It features a dual display for simultaneous temperature and humidity readings and comes with an integrated sensor. This controller is suitable for a wide range of applications requiring automatic switching of refrigeration, heating, humidification, and dehumidification devices.
Key Features:
- ABS flame retardant plastic shell for enhanced safety.
- Microcomputer intelligent digital display thermostat with dual display for temperature and humidity.
- Wide temperature and humidity measuring and controlling range.
- Large, clear digital display for easy reading of current temperature and humidity.
- Integrated sensor for accurate measurements.
- Suitable for automatic switching of refrigeration and heating devices, such as seafood machines and cooling water machines.
Image: The Walfront STC-3028 controller with its integrated temperature and humidity sensor. The display shows current temperature and humidity readings.
2. Technical Specifications
| Specification | Value |
|---|---|
| Model Name | STC-3028 |
| Brand | Walfront |
| Voltage (Current Model) | 12V |
| Material | ABS + Electronic Components |
| Display Type | Digital |
| Item Weight | 3.52 ounces |
| Resolution | 0.1 degree Fahrenheit |
| Indoor/Outdoor Usage | Indoor |
Image: Detailed dimensions of the STC-3028 controller and its integrated sensor, showing measurements in both millimeters and inches.
3. Setup and Wiring
Proper wiring is crucial for the safe and correct operation of the STC-3028 controller. Please refer to the diagrams below for wiring configurations. Ensure all connections are secure and follow local electrical codes.
Wiring Diagrams:
Image: Wiring diagrams for the STC-3028. Diagram 1 illustrates wiring with an independent power supply for the load, while Diagram 2 shows wiring where the load shares the same power supply as the controller. Both diagrams detail connections for power, sensor, heating, and humidity control.
Important Notes:
- Strictly distinguish the interface of the relay, sensor, and power supply.
- Ensure the sensor is connected correctly.
- Keep the sensor and power wire at a proper distance to avoid interference.
- For DC models (like the 12V version), observe polarity when connecting power.
4. Operating Instructions
The STC-3028 features a user-friendly interface with a clear digital display and intuitive buttons for setting temperature and humidity parameters.
Image: Front panel of the STC-3028 controller, highlighting the temperature work indicator, humidity work indicator, detecting temperature value, detecting humidity value, start temperature adjustment button, stop temperature adjustment button, start humidity adjustment button, and stop humidity adjustment button.
Setting Parameters:
The initial screen displays the current temperature and relative humidity (RH%).
- Start Temperature Setting:
- Press the Temperature Up (▲) button to display the current start temperature.
- Press and hold the Temperature Up (▲) button again until the display blinks. This enters edit mode.
- Use the Temperature Up (▲) and Temperature Down (▼) buttons to adjust the desired start temperature. Holding either button will scroll through numbers faster.
- Stop Temperature Setting:
- Press the Temperature Down (▼) button to display the current stop temperature.
- Press and hold the Temperature Down (▼) button again until the display blinks. This enters edit mode.
- Use the Temperature Up (▲) and Temperature Down (▼) buttons to adjust the desired stop temperature.
- Wait a few seconds for the device to exit edit mode and save the setting.
- Start Relative Humidity (RH%) Setting:
- Press the Humidity Up (▲) button to display the current start RH%.
- Press and hold the Humidity Up (▲) button again until the display blinks. This enters edit mode.
- Use the Humidity Up (▲) and Humidity Down (▼) buttons to adjust the desired start RH%. Holding either button will scroll through numbers faster.
- Stop Relative Humidity (RH%) Setting:
- Press the Humidity Down (▼) button to display the current stop RH%.
- Press and hold the Humidity Down (▼) button again until the display blinks. This enters edit mode.
- Use the Humidity Up (▲) and Humidity Down (▼) buttons to adjust the desired stop RH%.
- Wait a few seconds for the device to exit edit mode and save the setting.
Control Logic: The direction of temperature and humidity control depends on the set start and stop values. If the start temperature is lower than the stop temperature, the controller will activate a heating device. If the start temperature is higher than the stop temperature, it will activate a cooling device (e.g., fan). The same principle applies to RH% for humidification (start RH% lower than stop RH%) or dehumidification (start RH% higher than stop RH%).
5. Maintenance and Care
To ensure the longevity and accurate performance of your Walfront STC-3028 controller, follow these maintenance guidelines:
- Keep Dry: Avoid exposing the device to water or excessive moisture.
- Avoid Extreme Temperatures: Do not operate or store the controller in environments with extreme heat or cold beyond its specified operating range.
- Handle with Care: The device contains sensitive electronic components. Avoid dropping or subjecting it to strong impacts.
- Cleanliness: Periodically wipe the display and casing with a soft, dry cloth. Do not use abrasive cleaners or solvents.
- Sensor Care: Ensure the integrated sensor remains clean and free from dust or debris, as this can affect accuracy. Do not immerse the sensor in liquids unless specifically designed for such use.
6. Troubleshooting
This section addresses common issues you might encounter with your STC-3028 controller.
Common Issues:
- Display shows "L" or erratic readings:
If the display shows "L" across the screen or provides inconsistent readings, it often indicates an issue with the sensor connection or the sensor itself. Ensure the sensor is securely plugged into the correct port. Disconnect and reconnect the power to reset the device. If the problem persists, the sensor may be faulty or damaged.
- Controller not responding to settings:
Verify that you have correctly entered and saved the desired start and stop parameters. Ensure the device has exited edit mode after making changes. Check the power supply to the controller and the connected load devices.
- Humidity readings are inaccurate:
While the temperature control is generally precise, some users have reported variations in humidity sensor accuracy. Ensure the humidity sensor is clean and not obstructed. Avoid placing the sensor in areas with localized high humidity (e.g., direct condensation) that might not reflect the overall environment. If consistent inaccuracies are observed, consider calibrating with a known accurate hygrometer if the device supports it (this model does not explicitly state calibration features) or replacing the sensor if it's detachable.
For persistent issues not covered here, please contact Walfront customer support.
7. Typical Applications
The Walfront STC-3028 controller is versatile and can be used in various environments requiring precise temperature and humidity regulation.
Image: Used in fermentation processes to maintain optimal temperature and humidity for consistent results.
Image: Ideal for incubation, providing stable conditions for hatching eggs.
Image: Perfect for reptile terrariums to maintain specific temperature and humidity levels for animal well-being.
Image: Suitable for various DIY projects requiring automated environmental control.
Image: Can be integrated into greenhouse systems for climate management.
