1. Introduction
The STC-100A is a versatile temperature controller designed for various applications requiring precise temperature management. It supports both heating and refrigerating modes, allowing for flexible control based on your needs. Key features include adjustable temperature setting values, difference value control, delay protection for compressor starts, temperature range limits, temperature calibration, and an alarm for sensor errors.
Main Functions:
- Switch between heating and refrigerating modes.
- Control temperature by adjusting setting value and difference value.
- Delay protection for refrigeration and heating starts.
- Limit the temperature setting range.
- Calibrate the temperature sensor.
- Alarm indication for sensor errors.
2. Safety Information
Safety Rules:
- Danger:
- Strictly distinguish the connections of relay, sensor, and power.
- Ensure the relay is not overloaded.
- All wire connections must be operated under power-off status.
- Warning:
- Do not use the controller under circumstances such as over-moisture, over-high temperature, strong electromagnetic interference, or strong corrosion.
- Notice:
- Ensure the supply voltage matches the marking on the machine and that the power supply is stable.
- It is advised to keep proper distance between sensor leads and power supply wires to avoid possible interference.
3. Specifications
General Parameters:
| Parameter | Value |
|---|---|
| Model Number | STC-100A |
| Power Supply | 220VAC+10%/-15%, 50/60Hz (also available in 110VAC, 24VAC/DC, 12VAC/DC) |
| Power Consumption | <3W |
| Temperature Measuring Range | -40°C to +99°C |
| Temperature Controlling Range | -40°C to +99°C |
| Resolution | 1°C |
| Accuracy | ±1°C ±0.5 digit |
| Relay Output Capacity | 10A (0.5HP)/220VAC |
| Delay Time (Sensor Error) | 1 min |
| Sensor Type | NTC sensor (2-meter cable included) |
| Safety Level (Front Panel) | IP54 (IP65 for panel) |
| Operating Temperature | 0°C to +60°C (32 to 131°F) |
| Storage Temperature | -30°C to +75°C (-13 to 167°F) |
| Relative Humidity | 20% to 85% RH (non-condensing) |
| Front Panel Size | 77 (L) x 34.5 (W) mm |
| Installing Hole Size | 71 (L) x 29 (W) mm |
| Product Size | 77 (L) x 34.5 (W) x 62 (D) mm |
| Control Method | ON/OFF Control |
| Setting Method | Touch switch |
| Indication Method | 7-segment 3-digital display and LED indication |
4. Setup and Wiring
Before installation, ensure the power supply is disconnected. Mount the controller into a panel cutout of 71mm x 29mm. Connect the power supply, load, and temperature sensor according to the wiring diagram provided below. Pay close attention to the voltage requirements of your specific STC-100A model (e.g., 220VAC, 110VAC, 24VAC/DC, or 12VAC/DC).
This diagram illustrates the connections for the power supply (220VAC), load, and temperature sensor. Terminals 1, 2, 3 are for the load and always closed point. Terminals 4, 5 are for the temperature sensor. Terminals 6, 7 are for the power supply. Ensure correct voltage and proper distance between sensor and power wires.
A view of the top of the controller showing the screw terminals for wiring connections.
5. Operation
Operation and Display Panel:
The front panel features a two-digit LED display, 'Work' indicator, 'Set' button, and up/down arrow keys for navigation and parameter adjustment.
The two-digit LED displays the current temperature value and other information. The control buttons are:
- ▲ (Up Key): Increase value, navigate up.
- ▼ (Down Key): Decrease value, navigate down.
- Set Key: Enter/confirm parameter settings.
Indicator Light Status:
| Indicator Light | Code | Status | Function |
|---|---|---|---|
| Working status indicator light | ON | Flash | Control output delay |
| Working status indicator light | ON | Always on | Control output start up |
Operation Instructions:
-
Adjusting Temperature Setting Value:
While in normal working status, press the "Set" key to display the current temperature setting value. Use the ▲ or ▼ keys to increase or decrease the value. If no key operation occurs within 4 seconds, the system will automatically save the modified parameter and return to normal display.
Note: If "Er" is displayed during memory, the system will revert to normal display after 3 seconds.
-
Modifying Parameter Setting Values:
From normal working status, press and hold the "Set" key for more than 4 seconds to enter parameter modification mode. The LED will display the first parameter item code, "HC". Use the ▲ or ▼ keys to select the desired parameter code. Press the "Set" key to confirm the selection. To adjust the parameter value, press both "Set" and ▲ or ▼ keys simultaneously. The LED will display the increase or decrease in the parameter value. If no key operation occurs within 4 seconds, the system will save the modified value and return to normal display.
Note: If "Er" is displayed during data memory, the system will revert to normal display after 3 seconds.
-
Restoring System Data:
After powering on, the controller checks the parameter settings. If an error exists, "Er" will be displayed. Pressing any key will restore the default parameter settings, and the unit will operate normally. It is recommended to reset parameters in this situation.
Control Output Logic:
- Refrigerating Mode: If the working mode is set to "Refrigerating", the relay connects when the measured temperature is at or above the setting temperature plus the difference value. The relay disconnects when the measured temperature is at or below the setting temperature.
- Heating Mode: If the working mode is set to "Heating", the relay connects when the measured temperature is at or below the setting temperature. The relay disconnects when the measured temperature is at or above the setting temperature plus the difference value.
- Temperature Exceeding Range: If the temperature is between +99°C and +120°C, the LED displays "HH".
- Sensor Error: If a sensor error occurs, the LED displays "EE" and the system closes the output. The controller can restart or close only after the control output delay time has run out.
Menu Instruction Table:
| Menu Code | Menu Function | Setting Range | Unit | Default |
|---|---|---|---|---|
| HC | Controller working mode optional (C: refrigerating, H: heating) | C ~ H | none | C |
| d | Temperature control return difference | 1 ~ 15 | °C | 5 |
| LS | Temperature setting min. value | -40 ~ SP | °C | -40 |
| HS | Temperature setting max. value | SP ~ 99 | °C | 70 |
| CA | Temperature calibration value | -7 ~ +7 | °C | 0 |
| Pt | Control output protection time | 0 ~ 7 | minute | 1 |
| SP | Temperature setting value | LS ~ HS | °C | -40 |
Note: The parameter "SP" (temperature setting value) will not appear in the menu directly.
6. Maintenance
To ensure the longevity and accurate operation of your STC-100A temperature controller, follow these general maintenance guidelines:
- Cleaning: Regularly wipe the display and control panel with a soft, dry cloth. Avoid using abrasive cleaners or solvents that could damage the plastic.
- Environmental Conditions: Ensure the controller is operated within the specified temperature and humidity ranges (0°C to +60°C, 20% to 85% RH non-condensing). Protect it from excessive moisture, dust, and corrosive environments.
- Wiring Integrity: Periodically check all wiring connections to ensure they are secure and free from damage. Loose connections can lead to intermittent operation or electrical hazards.
- Sensor Care: Keep the temperature sensor clean and free from debris. Ensure it is properly positioned to accurately measure the desired temperature. Avoid bending or damaging the sensor cable.
- Power Supply: Verify that the power supply remains stable and within the specified voltage range for your model. Fluctuations can affect performance.
7. Troubleshooting
If you encounter issues with your STC-100A temperature controller, refer to the following table for common error codes and their solutions:
| Error Code | Error Analysis | Response Way |
|---|---|---|
| Er | Error during memory process | Press any key to restore default settings. |
| EE | Sensor error | Close control output; check sensor connection and replace if necessary. |
| HH | Temperature exceeds setting display range | Verify sensor placement and temperature conditions. |
If the problem persists after attempting these solutions, please consult the official product documentation or contact customer support.
8. User Tips
Based on general usage patterns for temperature controllers, here are some tips:
- Optimal Sensor Placement: For accurate readings, place the temperature sensor in a location that best represents the temperature of the area you wish to control, away from direct heat sources or drafts.
- Initial Calibration: If you suspect temperature inaccuracies, use the 'CA' parameter to calibrate the sensor against a known accurate thermometer.
- Understanding Delay Protection (Pt): The 'Pt' parameter prevents rapid cycling of your heating/cooling equipment, which can extend its lifespan. Adjust this value based on the type of equipment connected.
- Power Cycling: If the controller behaves unexpectedly, a simple power cycle (turning it off and then back on) can often resolve minor software glitches.
9. Warranty and Support
For detailed warranty information and customer support, please refer to the official documentation provided with your product. A comprehensive user manual in PDF format is available for download from the manufacturer's website. You can view the PDF manual at: STC-100A User Manual (PDF).
For technical assistance or inquiries not covered in this manual, please contact Finglai Electric customer service.