1. Product Overview
The STC-1000 and STC-3028 are versatile digital temperature and humidity controllers designed for precise environmental management. These devices can switch between cooling and heating modes, control temperature and humidity based on set values, and provide alarm functions for out-of-range conditions or sensor errors. They are suitable for various industrial and domestic applications requiring accurate climate control.
2. Specifications
| Feature | Specification |
|---|---|
| Temperature Measuring Range | -50 °C ~ 99 °C |
| Resolution | 0.1 °C |
| Accuracy | ± 1°C (-50 °C ~ 70 °C) |
| Sensor Error Delay | 1 minute |
| Power Supply Options | 110-220VAC 50/60Hz, 12Vdc, 24Vdc (model dependent) |
| Power Consumption | <3W |
| Sensor Type | NTC sensor (1PC included) |
| Relay Contact Capacity | Cool: 10A/220VAC; Heat: 10A/220VAC (Two relays) |
| Ambient Temperature | 0 °C ~ 60 °C |
| Storage Temperature | -30 °C ~ 75 °C |
| Relative Humidity | 20% ~ 85% (Non-condensing) |
| Sensor Cable Length | 1.0m (3.28 ft) |
| Front Panel Size | 75mm x 34.5mm |
| Product Size | 75mm x 34.5mm x 85mm |
| Mounting Size | 71mm x 29mm |
| Display Type | DIGITAL |
| Display Size | 1.9 Inches & Under |
| Device Type | Voltage Regulator, Temperature Controller |
| Smart Device | No |
3. Setup and Installation
The controller is designed for panel mounting. Ensure the mounting hole dimensions match the product specifications (71mm x 29mm). Connect the power supply, sensor, and load (heater/cooler) according to the wiring diagrams below. Always ensure power is disconnected before performing any wiring.
Wiring Notes:
- Power Supply: Connect the main power supply (110-220VAC, 12VDC, or 24VDC depending on model) to the designated terminals.
- Sensor: Connect the NTC sensor to the sensor terminals.
- Heating/Cooling Loads: Connect your heater and cooler devices to their respective relay output terminals.
- Independent vs. Shared Power: Choose the appropriate wiring diagram based on whether your loads require an independent power supply or can share the controller's power supply.
- Safety: Always consult a qualified electrician if you are unsure about wiring. Ensure all connections are secure to prevent short circuits or electrical hazards.
4. Operating Instructions
The controller features an intuitive interface for setting temperature and other parameters.
Button Functions:
- ON/OFF (Power Button): Press to turn the device on or off.
- SET (S Button): Press to enter parameter setting mode.
- UP (▲ Button): Increase parameter value or navigate up in menus.
- DOWN (▼ Button): Decrease parameter value or navigate down in menus.
Menu Settings:
To access and modify parameters, press the 'S' (SET) button. Use the UP/DOWN buttons to adjust values and 'S' again to confirm and move to the next parameter or exit.
| Code | Function | Set Range | Default |
|---|---|---|---|
| F1 | Temperature set value | -50.0 ~ 99.9°C | 10.0°C |
| F2 | Difference set value (Hysteresis) | 0.3 ~ 10.0°C | 0.5°C |
| F3 | Compressor delay time | 1 ~ 10 minutes | 3 minutes |
| F4 | Temperature calibration value | -10.0°C ~ 10.0°C | 0°C |
Basic Operation:
- Switching Modes (Cool/Heat): The controller automatically switches between cooling and heating modes based on the set temperature (F1) and difference value (F2). If the current temperature is above F1 + F2, it enters cooling mode. If below F1 - F2, it enters heating mode.
- Temperature Calibration (F4): Use F4 to fine-tune the temperature reading if there's a discrepancy with a known accurate thermometer.
- Compressor Delay (F3): This setting protects the compressor by preventing rapid cycling, extending its lifespan.
5. Maintenance
To ensure optimal performance and longevity of your controller:
- Cleaning: Regularly wipe the display and casing with a soft, dry cloth. Avoid using abrasive cleaners or solvents.
- Sensor Check: Periodically inspect the NTC sensor for any physical damage or corrosion. Ensure it is securely connected.
- Environmental Conditions: Operate the device within the specified ambient temperature and humidity ranges to prevent damage.
6. Troubleshooting
If you encounter issues with your controller, refer to the following common problems and solutions:
- Display Error / No Reading:
- Check if the power supply is correctly connected and active.
- Verify the NTC sensor connection. A loose or faulty sensor can cause error readings.
- Alarm Activation:
- The alarm triggers when the temperature exceeds the set limits or if there is a sensor error. Check the current temperature and sensor status.
- Heating/Cooling Not Activating:
- Ensure the set temperature (F1) and difference value (F2) are configured correctly for your desired operation.
- Check the wiring connections for the heating/cooling loads.
- Verify that the loads (heater/cooler) themselves are functional.
- Consider the compressor delay time (F3) if the load doesn't activate immediately after a temperature change.
- Inaccurate Temperature Reading:
- Use the temperature calibration function (F4) to adjust the reading if you have a reference thermometer.
- Ensure the sensor is placed in a location that accurately reflects the temperature you wish to measure and control.
7. User Tips
Based on general usage, here are some tips for optimizing your experience:
- For critical applications, always verify the controller's readings with an independent, calibrated thermometer.
- When setting the difference value (F2), a smaller value provides tighter control but may lead to more frequent cycling of the heating/cooling unit. A larger value reduces cycling but allows for wider temperature fluctuations.
- Ensure proper ventilation around the controller to prevent overheating, especially if mounted in an enclosed space.
8. Warranty and Support
For any issues not covered in this manual, or for warranty inquiries, please contact the seller or manufacturer directly. Keep your purchase records handy for faster service.