Wire the safety chains (high-pressure switches, compressor modules, oil level switches) to the configurable digital inputs.
is a highly specialized industrial controller designed specifically for the complete management of compressor racks and condenser fans within a refrigeration system's machine room. Engineered to optimize both the suction (compression) and delivery (condensation) thermodynamic phases, the controller helps commercial and industrial refrigeration plants scale efficiency, control multi-stage hardware, and achieve stable pressure regulation.
The EWCM 900/S is programmed via its built-in keypad and display. The configuration is organized into two levels:
Eliwell EWCM 900/S is a robust, industrial-grade controller designed for managing machine rooms in refrigeration systems. It is highly regarded for its ability to handle complex setups, including single-unit multistep compressors and condenser fans, while maintaining operational stability. Eliwell France Key Strengths & Features Versatile Compressor Management eliwell ewcm 900 s
The EWCM 900/S is a dedicated controller for managing the compression and condensation phases in refrigeration systems. It serves as the "brain" of a compressor rack, controlling multiple reciprocating compressors—even those with varying capacities—and managing condenser fans based on demand.
The operating voltage depends on the specific model (typically 230V or 24V, check the label on the device).
To prevent short-cycling and maintain a steady suction pressure, the EWCM 900 S can manage a lead compressor equipped with a frequency inverter or a Copeland Digital Scroll mechanism. The controller modulates the capacity of the lead compressor seamlessly before staging fixed-speed backup compressors. 3. Condenser Dynamic Setpoint (Floating Head Pressure) The EWCM 900/S is programmed via its built-in
: Typically operates on 230V AC (with 24V available upon request).
The Eliwell EWCM 900 S remains a reliable and robust choice for controlling commercial and industrial refrigeration compressor racks. With its comprehensive management features for both compressors and fans, high-level alarm system, and flexibility in handling different configurations, it is an essential component for modern cooling infrastructure.
Unlike basic thermostats, the logic embedded within the Eliwell EWCM 900/S Manual enables complex handling of different compressor arrangements: EWCM 900/S rel. 5/2000 ing compressors and fans manager Eliwell France Key Strengths & Features Versatile Compressor
, here is the standard approach:
Identical compressors without power fractionating.
Regulating multiple refrigeration circuits safely across expansive facilities. Installation and Wiring Guidelines
Designed for flush panel mounting (cutout 67x137 mm).