1. Introduction
The Eliwell EWPlus 974 is a versatile digital thermostat controller designed for refrigeration applications. It offers precise temperature management, intuitive operation, and robust performance, making it suitable for various chilled environments. This manual provides essential information for the proper installation, operation, and maintenance of your EWPlus 974 controller.
2. Key Features
- Direct management of loads up to 2 HP and power of 230 VA.
- Simple and intuitive menus for rapid learning and ease of use.
- LCD display with large figures and colorful icons for clear operational status.
- Flexible and high-performance control for chilled plug-in units.
- Supports sconnettibili/Faston connectors/screw terminals for flexible cabling.
- USB unicard compatibility for custom configurations.
- Suitable for applications involving hydrocarbons.
3. Package Contents
Please verify that all items are present and undamaged upon unpacking.
- 1 x Eliwell EWPlus 974 Digital Thermostat Controller
- Cables (as supplied)
4. Installation and Setup
Proper installation is crucial for the safe and efficient operation of the EWPlus 974 controller. It is recommended that installation be performed by a qualified technician.
Front view of the Eliwell EWPlus 974 digital thermostat controller, showing the display with a temperature reading and control buttons.
4.1 Mounting
The controller is designed for panel mounting. Ensure adequate ventilation around the unit to prevent overheating. Refer to the physical dimensions in the specifications section for cutout requirements.
4.2 Wiring
The EWPlus 974 operates on 220V. Connect the power supply and sensor/load cables according to the wiring diagram provided with the product packaging. Utilize the sconnettibili/Faston connectors or screw terminals for secure and reliable connections. Ensure all connections are tight and correctly insulated to prevent electrical hazards.
- Power Supply: Connect to a stable 220V AC source.
- Sensor Inputs: Connect temperature probes to the designated terminals.
- Relay Outputs: Connect to the refrigeration compressor, fans, defrost heaters, or other controlled devices. The controller features 2 configurable relay outputs.
5. Operating Instructions
The EWPlus 974 features an intuitive interface with an LCD display and control buttons for easy parameter setting and monitoring.
5.1 Basic Operation
- Power On/Off: Use the power button (usually marked with a circle and vertical line) to turn the unit on or off.
- Display: The LCD shows the current temperature and operational status using large figures and clear icons.
- Navigation Buttons: Use the arrow buttons (up/down) to navigate through menus and adjust values.
- SET Button: Press the SET button to enter parameter setting mode or confirm a selection.
5.2 Parameter Settings
To access and modify parameters (e.g., setpoint temperature, defrost cycles, fan control), typically press and hold the SET button for a few seconds until the display changes. Navigate through the parameters using the arrow keys and adjust values as needed. Refer to the detailed programming manual (if supplied separately) for a complete list of parameters and their functions.
6. Maintenance
Regular maintenance ensures the longevity and optimal performance of your controller.
- Cleaning: Gently wipe the display and casing with a soft, dry cloth. Do not use abrasive cleaners or solvents.
- Inspection: Periodically check all wiring connections for tightness and signs of wear or damage.
- Ventilation: Ensure that the ventilation openings are clear of dust and debris to maintain proper airflow.
7. Troubleshooting
This section addresses common issues you might encounter. For more complex problems, contact technical support.
| Problem | Possible Cause | Solution |
|---|---|---|
| Controller does not power on | No power supply; Loose wiring | Check power source; Verify all power connections are secure. |
| Incorrect temperature reading | Faulty sensor; Sensor not connected properly | Check sensor wiring; Replace sensor if necessary. |
| Load (e.g., compressor) not activating | Setpoint issue; Relay fault; Wiring error | Verify setpoint and differential settings; Check load wiring; Consult a technician if relay is suspected. |
8. Technical Specifications
| Specification | Detail |
|---|---|
| Model | EWPlus 974 |
| Manufacturer | Eliwell |
| Voltage | 220 Volts |
| Wattage | 1492 watts |
| Item Weight | 220 g |
| Package Dimensions | 13.1 x 9.5 x 4.9 cm |
| Material | Metal |
| Colour | Black |
| Display Style | Graphical LCD |
| Connectivity Technology | USB |
| Power Source | Corded Electric |
| Specific Uses | Refrigeration Controller |
9. Warranty and Support
The Eliwell EWPlus 974 controller is manufactured to high-quality standards. For information regarding warranty coverage, terms, and conditions, please refer to the documentation provided at the time of purchase or contact your supplier. For technical assistance, troubleshooting beyond this manual, or spare parts, please reach out to the authorized Eliwell service center or your product distributor.
