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Eliwell EWCM 900 S is a specialized controller designed to manage refrigeration machine rooms. It is primarily used for controlling compressor racks (including single, multi-stage, or different capacity units) and condenser fans. Eliwell France Key Specifications : Features 11 relay outputs that can be configured for either compressors or fans.

| Code | Meaning | Solution | | :--- | :--- | :--- | | E1 | Probe 1 faulty / shorted | Check wiring on terminals 9-10. Replace probe (NTC 10k@25°C or PTC 1k). | | E2 | Probe 2 faulty (Evaporator) | Check terminals 11-12. Defrost may run on time-only (MDf) – energy waste. | | E3 | Probe 3 faulty | Optional probe; check wiring if configured as alarm input. | | HA | High temperature alarm | Temperature above "ALc" (High alarm) for time > "ALd". Check refrigeration circuit. | | LA | Low temperature alarm | Temperature below "ALL" (Low alarm). Possible evaporator fan stuck ON or refrigerant floodback. | | dA | Door open alarm | Digital input 1 active for > "dod" time. Close door or check door switch (magnets). | | nt | Network timeout (TelevisSystem) | Controller is addressed but lost communication with BMS. Check RS485 wiring. | | EE | EEPROM failure | Internal memory corrupt. Cycle power. If persists, replace controller. |

The Eliwell EWCM 900 S offers numerous benefits to users, including:

The Eliwell EWCM 900 S has the following technical specifications:

  • Improved Temperature Control: The controller's precise temperature control ensures that refrigerated products are stored at the optimal temperature, reducing the risk of spoilage and improving food safety.
  • Increased Energy Efficiency: The EWCM 900 S's advanced defrost management and temperature control features help to reduce energy consumption, lowering operating costs and improving system efficiency.
  • Enhanced Reliability: The controller's robust design and advanced alarm functions help to prevent system failures and reduce downtime, ensuring that refrigeration systems operate reliably and efficiently.

Safety and reliability are non-negotiable in refrigeration, and the EWCM 900 S is built to provide peace of mind. It includes a comprehensive suite of protection features, such as high and low-pressure alarms, oil level monitoring, and motor protection. In the event of a fault, the controller can initiate emergency protocols to prevent equipment damage and product loss. The internal memory stores a history of events and alarms, which is invaluable for diagnosing recurring issues and improving long-term system stability.