1. Introduction
The Finglai STC-9200 is a versatile microcomputer temperature controller designed for industrial and commercial refrigeration systems. It integrates control functions for refrigeration, defrosting, and fan operation, along with dual sensor inputs and alarm capabilities for temperature overrange and sensor faults. This manual provides essential information for the proper installation, operation, and maintenance of your STC-9200 controller.
2. Main Functions and Features
- Multi-control modes for refrigeration, defrost, and fan.
- Separate user and administrator menus for convenient operation and high-level management.
- Differential control mode with 0.1°C temperature display resolution.
- Multiple protection and alarm modes (optional).
- Copy key function (optional).
- Equipped with two NTC temperature sensors.
3. Technical Specifications
| Parameter | Value |
|---|---|
| Model Number | STC-9200 |
| Measure Range | -50 to 90 °C |
| Setting Range | -50 to 50 °C |
| Resolution | 0.1 °C |
| Accuracy | ±1 °C (-40 to 50 °C), ±2 °C (50 to 70 °C) |
| Supply Voltage Options | 220VAC, 110VAC, 12VAC/DC, 24VAC/DC (one option per unit) |
| Power Consumption | Less than 5W |
| Output Types | Three mechanical relays (Compressor, Fan, Defrost) |
| Relay Capacity (Compressor, Fan, Defrost) | 8A at 220Vac (each) |
| Input Types | 2pcs 2m cable NTC sensors |
| Panel Size | 75 x 34.5 mm |
| External Dimensions | 75 x 34.5 x 85 mm |
| Perforation Dimensions | 71 x 29 mm |
| Control Method | ON/OFF Control |
| Setting Method | Touch switch |
| Indication Method | Three-digit LED + Minus digit + Status indicator light (set, refrigeration, defrost, fan) |
| Front Panel IP Rating | IP65 |
| Operating Temperature | 0 to 55 °C (32 to 131 °F) |
| Operating Humidity | 20% to 85% RH, non-condensing |
| Storage Temperature | -25 to 75 °C (-13 to 167 °F) |
4. Package Contents
Upon opening the package, you should find the following items:
- 1 x STC-9200 Temperature Controller
- 2 x NTC Temperature Sensors (2m cable each)
- 1 x Instruction Manual (this document or similar)
5. Installation and Wiring
The STC-9200 controller is designed for panel mounting. Ensure the perforation dimensions (71 x 29 mm) are met for a secure fit. Before proceeding with wiring, ensure all power sources are disconnected to prevent electrical shock.
5.1 Wiring Diagram
Refer to the diagram above for proper connections. The terminals are labeled as follows:
- Terminals 1 & 2: Compressor Relay Output (10A)
- Terminals 3 & 4: Defrost Relay Output (10A)
- Terminals 5 & 6: Fan Relay Output (10A)
- Terminals 7 & 8: Power Supply (e.g., 220VAC, 110VAC, 24V, 12V depending on model)
- Terminals 9 & 10: Room Probe (NTC Sensor 1)
- Terminals 11 & 12: Defrost Probe (NTC Sensor 2)
5.2 Important Wiring Notes
- Strictly distinguish the interface of the relay, sensor, and power connections. Incorrect wiring can damage the unit or connected equipment.
- Ensure proper distance is maintained between sensor down-lead wires and power wires to avoid interference.
- Verify that the supply voltage matches the specific model of your STC-9200 controller (e.g., 220VAC, 110VAC, 24VAC/DC, or 12VAC/DC).
6. Operation
6.1 Keypad Functions
| Keystroke Operation | Function Description |
|---|---|
| SET (short press) | View current temperature |
| SET (long press) | Enter/Exit parameter setting |
| ▲ | Increase value |
| ▼ | Decrease value |
| SET + ▲ | Enter administrator menu |
| SET + ▼ | Enter administrator menu |
| ▲ + ▼ | Lock/Unlock keypad |
6.2 Indicator Lights
| Light (Icon) | Status | Description |
|---|---|---|
| Refrigeration (Snowflake) | On | Refrigeration working |
| Refrigeration (Snowflake) | Flash | Compressor delay |
| Defrost (Water drops) | On | Defrost working |
| Defrost (Water drops) | Flash | Defrost delay |
| Fan (Fan blades) | On | Fan working |
| Fan (Fan blades) | Flash | Fan delay |
| Set (SET) | On | Parameter setting |
| Set (SET) | Flash | Parameter setting |
6.3 Basic Parameter Settings
To adjust parameters, long press the SET button until the display flashes. Use the ▲ and ▼ buttons to navigate through parameters (F1, F2, etc.) and adjust their values. Press SET again to confirm and move to the next parameter, or long press SET to exit the setting mode.
| Menu | Description | Default |
|---|---|---|
| F1 | Temperature setting | 0 |
| F2 | Differential setting | 2 |
| F3 | Compressor delay time | 5 |
| F4 | Defrost time | 0 |
| F5 | Defrost interval | 0 |
| F6 | Defrost temperature | 0 |
| F7 | Fan delay time | 0 |
| F8 | Fan working time | 0 |
| F9 | Fan stop time | 0 |
| FA | Alarm temperature | 0 |
| FB | Alarm differential | 0 |
| FC | Sensor calibration | 0 |
| FD | Sensor fault alarm | 0 |
| FE | Compressor protection | 0 |
| FF | Defrost protection | 0 |
| FG | Fan protection | 0 |
For detailed descriptions of each parameter and advanced settings, please refer to the full PDF manual.
7. Maintenance
- Cleaning: Regularly wipe the front panel with a soft, damp cloth. Do not use abrasive cleaners or solvents.
- Sensor Inspection: Periodically check the NTC sensors and their cables for any signs of damage or wear. Ensure they are securely connected.
- Ventilation: Ensure the controller's ventilation openings are not obstructed to prevent overheating.
- Power Supply: Verify that the power supply remains stable and within the specified voltage range for your model.
8. Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| Controller not powering on | No power supply; Incorrect voltage; Loose wiring | Check power connection; Verify voltage matches unit; Inspect wiring connections |
| Inaccurate temperature reading | Faulty sensor; Sensor placed incorrectly; Interference | Check sensor connection; Reposition sensor; Ensure sensor wires are away from power lines |
| Compressor/Fan/Defrost not activating | Incorrect parameter settings; Relay fault; Wiring error | Review F1-F9 parameters; Check relay connections; Consult full manual for specific fault codes |
| Keypad unresponsive | Keypad locked | Press ▲ + ▼ simultaneously to unlock the keypad |
9. User Tips
- This controller is commonly used for industrial and commercial refrigerators, managing the compressor, defrost cycle, and circulation fan.
- Always double-check the voltage specification of your STC-9200 unit (e.g., 12V, 24V, 110V, 220V) before connecting power to avoid damage.
- For optimal performance, ensure the room probe is placed in a location representative of the overall temperature, and the defrost probe is correctly positioned on the evaporator coil.
10. Warranty and Support
Finglai Electric provides support for its products. For detailed warranty information, technical assistance, or to download the latest version of the manual, please refer to the official Finglai website or contact your local distributor.
Official manual links: