1. Introduction
The STC-8000H is a versatile single-sensor temperature controller designed for refrigeration applications. It features functions such as temperature control, exceeding temperature limit alarms, and adjustable compressor delay times. It is suitable for various refrigerant industries, including refrigerators and refrigerated vehicles.
For a more detailed guide, a PDF version of this manual is available: STC-8000H User Manual (PDF).
2. Safety Regulations
Danger:
- Strictly distinguish the sensor down-lead, power wire, and output relay interface from one another. Prohibit wrong connections or overloading the relay.
- All connections should be modified under electricity cut-off.
Warning:
- Prohibit using the machine in water or under environments of excessive damp, high temperature, strong electromagnetism interference, or strong corrosion.
Caution:
- The power supply should conform to the one labeled on the machine, and ensure the stability of the power voltage.
- Sensor down-lead and power wire should be kept a proper distance to avoid possible interferences.
3. Specifications
| Parameter | Value |
|---|---|
| Model Number | STC-8000H |
| Theory | Temperature Controller |
| Display Type | DIGITAL (8-segment 3-digital display and LED indication) |
| Power Type | Charger |
| Certification | CE |
| Max Measuring Temperature | 120°C & Above |
| Style | Standing Station |
| Use | Industrial |
| Display Size | 2.0 - 3.9 Inches |
| Power Supply Options | 220VAC, 110VAC, 24VAC/DC, 12VAC/DC (select one) |
| Power Consumption | <3W |
| Temperature Measuring Range | -50°C ~ 99°C |
| Temperature Controlling Range | -40°C ~ 50°C |
| Resolution | 1°C |
| Accuracy | ±1°C (-50 to 70°C), ±2°C (Other) |
| Refrigeration Output Contact Capacity | 10A/277VAC (can drive single phase compressor ≤1/2HP) |
| Sensor Error Delay Time | 1 min |
| Sensor Type | NTC (2-meter probe included) |
| Operating Temperature | 0°C ~ 60°C |
| Operating Humidity | 20% ~ 85% RH (no condensate) |
| Storage Temperature | -30°C ~ 75°C |
| Safe Level | IP65 (Front panel IP64) |
| Front Panel Size | 75 x 34.5 mm |
| Product Size | 75 x 34.5 x 85 mm |
| Installing Hole Size | 71 x 29 mm |
4. Installation and Wiring
Physical Installation:
The controller is designed for panel mounting. Ensure the installing hole size is 71x29mm. Secure the unit using the provided clips on the sides.
Wiring Diagram:
Refer to the diagram below for proper wiring connections. Ensure all connections are made with the power supply disconnected.
Wiring Terminal Details:
- Terminals 1, 2, 3 (Compressor Output - 10A/277VAC):
- 1: Common (Co-point)
- 2: Normally Open (Co-point)
- 3: Normally Closed (Closed point)
- Terminals 4, 5: Storage Temperature Sensor
- Terminals 6, 7, 8: Power Supply (e.g., 220VAC, 110VAC, 24VAC/DC, 12VAC/DC depending on model)
Important Notes for Wiring:
- Strictly distinguish the interfaces for the relay, sensor, and power.
- Ensure proper connection of the sensor and power.
- The sensor down-lead and power wire should be kept at a proper distance to prevent interference.
5. Operation
Front Panel Overview:
The front panel includes a digital display, 'Cool' and 'Set' indicator lights, and four buttons: 'Set', 'Up (▲)', 'Rst', and 'Down (▼)'.
Key-Press Functions:
| Key-Press | Normal Mode Function | Parameter Modification Mode Function |
|---|---|---|
| Set | Check compressor protection time | Display current menu set value |
| Set (3s) | Enter into parameter modification | |
| Rst | Check temperature exceeding value | Quit from parameter modification |
| ▲ | Temperature upper limits checking | Menu items go backwards / Parameter values increase by degrees |
| ▼ | Temperature lower limits checking | Menu items go forwards / Parameter values decrease by degrees |
Parameter List and Settings:
The following table details the configurable parameters:
| ITEM | FUNCTION | SETTING RANGE | UNIT | DEFAULT |
|---|---|---|---|---|
| F1 | Upper limit | F2 ~ +50 | °C | -10 |
| F2 | Lower limit | -40 ~ F1 | °C | -20 |
| F3 | Temperature calibration | -5 ~ 5 | °C | 0 |
| F4 | Compressor protection time | 0 ~ 9 | min | 3 |
| F5 | Exceeding temperature value | 0 ~ 50 (set value as 0 to cancel alarm) | °C | 15 |
| F6 | Exceeding temperature alarm delay time | 0 ~ 99 | min | 20 |
Modify Parameter Set Value:
- Press the 'Set' button for more than 3 seconds to enter parameter modifying status. The last adjusted menu will be displayed with the parameter modifying indicator light on.
- Press '▲' or '▼' to navigate through the menu items. Press 'Set' to display the current parameter set value.
- Press 'Set' and '▲' simultaneously to adjust the current parameter value. Holding 'Set' and '▲' for more than 1 second will increase the value quickly. Similarly, holding 'Set' and '▼' will decrease the value quickly.
- Press 'Rst' or allow no key operation for 30 seconds to save the modified parameter and return to normal temperature display status.
Restore Default Parameter Setting:
When powering on the controller, if the parameter setting is incorrect, the LED will display 'E1' with a buzzer sound. At this time, press 'Set' to restore the default parameter settings. It is advised to reset the parameters if this occurs.
Control Output:
Compressor:
- When the storage temperature is higher than the set upper limit, the compressor starts.
- When the storage temperature is lower than the set lower limit, the compressor stops.
- If a sensor error occurs, the compressor will operate proportionally (e.g., 15 minutes ON, 30 minutes OFF).
- After power-on or compressor stop, the compressor restart-up is allowed only after the compressor protection time has elapsed.
Alarm:
- If the temperature exceeds the set value (F5 is not 0), the LED will blink, displaying the current temperature when the storage temperature is higher than (set temperature upper limit + exceeding temp. value) or lower than (set lower limit - exceeding temp. value).
- After the exceeding temperature limit alarm delay (F6) has elapsed after power-on, the exceeding temperature limit alarm will start with a buzzer sound. The alarm cancels when the temperature returns to normal.
- Press any key to cancel the alarm sound, but the alarm status will remain.
6. Troubleshooting
The controller provides error codes to help diagnose issues:
| Code | Reason | Status |
|---|---|---|
| E1 | Memorizer error | Alarm, machine does not work |
| E2 | Sensor error | Alarm, Compressor starts/stops proportionally |
| HH | Exceeding temp. display limit | Temperature is higher than 99°C and lower than 120°C |
7. Maintenance
To ensure optimal performance and longevity of your STC-8000H temperature controller, follow these general maintenance guidelines:
- Keep the device clean and free from dust and debris.
- Avoid exposing the controller to extreme temperatures, high humidity, or corrosive environments.
- Regularly check wiring connections for tightness and signs of wear.
- Ensure proper ventilation around the unit to prevent overheating.
- If the device requires cleaning, use a soft, dry cloth. Do not use harsh chemicals or abrasive materials.
8. User Tips
No specific user tips were available from the provided customer reviews or Q&A data.
9. Warranty and Support
For warranty information and technical support, please refer to the documentation provided with your purchase or contact the manufacturer directly. Ensure you have your model number (STC-8000H) and purchase details ready when seeking support.