1. Introduction
This manual provides detailed instructions for the installation, operation, and maintenance of the ELIWELL ST544 and ST544/C NTC Temperature Controllers. These controllers are designed for precise temperature management, particularly in air conditioning applications, and operate on a 12V AC supply.
2. Safety Information
Please read this section carefully before installation or operation to ensure safe and proper use of the device.
- Disconnect power before performing any installation or maintenance.
- Ensure the power supply matches the controller's specifications (12V AC ±10%).
- All wiring must comply with local and national electrical codes.
- Do not expose the device to excessive moisture or extreme temperatures outside its operating range.
- Only qualified personnel should perform installation and wiring.
3. Specifications
| Parameter | Value |
|---|---|
| Model | ST544 / ST544/C |
| Product Code | ST54121410300 |
| Application | Air conditioning |
| Power Supply | 12V AC ±10% |
| Probe Type | NTC Probe |
| Temperature Range | -20°C to 60°C |
| Protection Rating | IP65 |
| Output Relays | TC1, DO1, DO2, DO3, DO4 (all 2A 250V~) |
4. Installation and Wiring
The controller is designed for panel mounting. Ensure adequate ventilation and avoid locations subject to strong vibrations, corrosive gases, or excessive dust.
4.1 Mounting
Mount the controller into a standard panel cutout. Secure it using appropriate mounting hardware.
4.2 Wiring Diagram
Refer to the diagram below for correct electrical connections. All connections must be made with the power supply disconnected.
- Power Supply (12V AC): Connect the 12V AC supply to the terminals marked 'N' and '12V~'.
- NTC Probe: Connect the NTC temperature probe to the designated terminals.
- Outputs (DO1, DO2, TC1, DO3, DO4): These are relay outputs, rated at 2A 250V~. Connect your controlled devices (e.g., compressors, fans, heaters) to these terminals as per your application's requirements. 'N' terminals are common for some outputs.
- Other Connections: Terminals like IDS, ID2, ID1, KEYB, AO3, AO2 are likely for digital inputs, communication, or auxiliary outputs. Refer to the full product datasheet for detailed functionality of these specific terminals if required.
5. Operation
The ST544 controller features a digital display and buttons for setting parameters and monitoring temperature. Specific operational details, including parameter codes and navigation, are typically found in the comprehensive programming manual for Eliwell controllers. This section provides general guidance.
5.1 Display
The front display shows the current temperature measured by the NTC probe or various parameter values during programming.
5.2 Buttons
The controller typically includes buttons for:
- Set: To enter parameter setting mode or confirm a value.
- Up/Down Arrows: To navigate through parameters or adjust values.
- Function/Auxiliary: For specific functions like manual defrost or viewing status.
Consult the full programming manual for detailed instructions on setting temperature setpoints, differentials, and other control parameters relevant to your air conditioning application.
6. Maintenance
Regular maintenance ensures optimal performance and longevity of your controller.
- Cleaning: Periodically clean the front panel with a soft, damp cloth. Do not use abrasive cleaners or solvents.
- Connections: Annually check all electrical connections for tightness and signs of corrosion.
- Probe: Ensure the NTC probe is clean and properly positioned for accurate temperature readings.
- Ventilation: Verify that the controller's ventilation openings are not obstructed.
7. Troubleshooting
This section addresses common issues you might encounter. For more complex problems, contact technical support.
| Problem | Possible Cause | Solution |
|---|---|---|
| Controller not powering on | No power supply; incorrect wiring; blown fuse (internal/external) | Check 12V AC power supply; verify wiring connections; inspect fuses. |
| Inaccurate temperature reading | Faulty NTC probe; probe incorrectly positioned; wiring issue to probe | Check probe connection; reposition probe; replace probe if damaged. |
| Outputs not switching | Incorrect parameter settings; faulty relay; wiring issue to load | Review setpoint and differential settings; check load wiring; contact support if relay is suspected faulty. |
| Display shows error code | Sensor error; internal fault | Consult the full Eliwell manual for specific error code meanings and solutions. |
8. User Tips
- Always ensure the NTC probe is placed in a location that accurately reflects the temperature you wish to control.
- For critical applications, consider using an external temperature monitor to cross-verify readings.
- Keep a record of your parameter settings for quick reference or if a reset is needed.
9. Warranty and Support
For technical assistance, troubleshooting beyond this manual, or warranty inquiries, please contact your supplier or ELIWELL customer service. Keep your purchase receipt and product code (ST54121410300) handy when contacting support.
Seller: Good Luck 1053 Store
