Product Overview
The W3002 is a microcomputer-controlled digital temperature controller designed for precise temperature regulation. It features a clear LED display, intuitive control buttons, and supports both heating and cooling applications.
The unit is designed for 220V power supply and direct 220V output. It includes terminals for power input (N, L), output (N, L), and a sensor connection.
Control buttons include: Set (to enter menus and confirm settings), Up (to increase values), and Down (to decrease values).
Parameter Settings
The controller offers several parameters to configure its operation:
| Code | Describe | Set Range | Factory Settings |
|---|---|---|---|
| P0 | Start temperature | -50-110℃ | 00 |
| P1 | Stop temperature | -50-110℃ | 00 |
| P2 | Temperature correction | -10-10℃ | 0°C |
| P3 | Delay start | 0-10 minute | 0 minute |
P0 - Set Starting Temperature
Press the Set button once to enter the internal menu. The default display is P0. Press the Set button again, and use the Up and Down keys to set the required starting temperature.
P1 - Set Stopping Temperature
Press the Set button once to enter the internal menu. The digital display will show 0. Use the Up and Down keys to switch to P1. Press the Set button again, and use the Up and Down keys to set the required stopping temperature.
P2 - Set Temperature Calibration
Enter the internal menu as before. Use the Up and Down keys to switch to P2. Press the Set button again, and use the Up and Down keys to set the required calibration temperature. During setting, if the detected temperature value is 0.5 degrees higher than the actual temperature, set the calibration temperature to -0.5 degrees. If the detected temperature value is 1 degree lower than the actual temperature, set the calibration temperature to 1 degree. The formula is: Detected temperature + calibration temperature = actual temperature.
P3 - Set Delayed Start
Enter the internal menu. Use the Up and Down keys to switch to P3. Press the Set button again, and use the Up and Down keys to set the required delay time (in minutes). Delayed start is typically used for compressor refrigeration (e.g., refrigerators or freezers) to prevent rapid cycling. A set value of 3-6 minutes is common, depending on compressor back pressure. If you are not controlling a compressor or do not need this function, skip this setting.
Operating Modes
Heating Mode Setting Method
Setting Essentials: Start temperature < Stop temperature. The program automatically selects heating mode.
Setting Method: Enter the internal menu. Set the start temperature using the P0 value and the stop temperature using the P1 value.
Usage Example: To control a water heater that stops heating at 50°C and starts heating again when the temperature drops to 40°C:
- Determine the working mode as heating, ensuring start temperature < stop temperature.
- Press Set to enter the menu, select P0, press Set, and set P0 to 40°C.
- Press Set to enter the menu, select P1, press Set, and set P1 to 50°C.
Refrigeration Mode Setting Method
Setting Essentials: Start temperature > Stop temperature. The program automatically selects refrigeration mode.
Setting Method: Enter the internal menu. Set the start temperature using the P0 value and the stop temperature using the P1 value.
Usage Example: To control a cabinet radiator that stops cooling at 26°C and starts cooling again when the temperature rises to 30°C:
- Determine the working mode as refrigeration, ensuring start temperature > stop temperature.
- Press Set to enter the menu, select P0, press Set, and set P0 to 30°C.
- Press Set to enter the menu, select P1, press Set, and set P1 to 26°C.
Troubleshooting and Maintenance
Common Faults
Heating Mode Value Reversal: If the set temperature values are accidentally reversed in heating mode (e.g., start temp > stop temp), the output indicator will not light up, and the load will not operate. Verify that the set temperature values are correctly ordered.
Digital Tube Displays
- LLL: Indicates a sensor failure. Inspect the sensor or replace it.
- HHH: Indicates that the measured temperature exceeds the measurement range. Consider changing the usage environment.
How to Restore Factory Settings
To restore factory settings: When powering on the unit, hold down both the Up and Down keys simultaneously for approximately 3 seconds. The digital tube will display '888', after which it will automatically jump to the detected temperature, indicating that factory settings have been successfully restored.
