Summary
- The new WCDU provides up to 3.5MW of cooling at 1.5 litres per minute per kW.
- Up to 20 units can operate as a coordinated group for 30–40MW data halls.
- Technical-corridor installation and hybrid air/liquid support target both new builds and retrofits.
Schneider Electric has launched a coolant distribution unit capable of handling up to 3.5MW of cooling, pushing liquid-cooling infrastructure further out of the rack and into the scale of complete high-density data halls.
The Motivair WCDU is designed primarily for technical-corridor deployment and can operate alongside fan-wall air cooling, allowing facilities to combine liquid and air systems rather than committing an entire hall to one thermal architecture.
At a flow rate of 1.5 litres per minute per kW, one unit is rated for up to 3.5MW. At 2.0 litres per minute per kW, it provides up to 2.5MW. Schneider says as many as 20 WCDUs can operate together in group mode, giving the system enough aggregate capacity for 30–40MW data halls.
The unit integrates pumps, heat exchangers, filters, valves, and controls into a single steel frame. Top-entry connections and zero lateral clearance are intended to reduce the footprint around the equipment and keep cooling plant outside valuable white-space areas.
The CDU is becoming facility infrastructure
Coolant distribution units were once treated largely as an interface between a relatively small liquid-cooled compute deployment and the facility water system. Rack densities associated with modern accelerated computing are changing that scale.
When several megawatts of IT load are transferred through liquid, the CDU becomes a significant piece of mechanical plant in its own right. Pump resilience, heat-exchanger capacity, filtration, controls, isolation, water temperatures, and maintenance access all become part of the data hall’s availability design.
Schneider’s approach also reflects the likelihood that many facilities will operate mixed environments for years. AI racks may require direct liquid cooling while storage, networking, conventional servers, or earlier compute generations remain air cooled. A design that can support both reduces the need to rebuild an entire thermal system every time the IT mix changes.
The company says the WCDU can operate with approach temperatures as low as 2°C. A smaller temperature difference between the facility water loop and the technology cooling loop can allow warmer facility-water temperatures, reducing the amount of mechanical refrigeration required in suitable operating conditions.
That does not translate automatically into a particular PUE saving. Whole-site efficiency depends on climate, heat-rejection equipment, pumping power, water temperatures, IT utilisation, controls, and the proportion of the load actually captured by liquid. The practical advantage is that a lower approach temperature gives designers more room to run warmer loops where the rest of the system supports it.
Retrofit pressure is shaping mechanical design
The technical-corridor layout is particularly relevant to existing facilities. Operators retrofitting a hall for higher-density racks often have limited floor space inside the white space and may be unwilling to move structural walls, containment, or established air systems solely to accommodate cooling equipment.
Locating larger CDUs in an adjacent technical area can make servicing easier and preserve compute floor area, although it also requires appropriately sized pipework, isolation, leak management, and routes between the CDU and the rack cooling loops.
For deployments up to 2.5MW, Schneider offers an N+1 configuration for pumps and valves. Hot-swappable pumps, pressure-independent control valves, 25-micron filtration, and a 15-inch control interface are also included in the design.
The new unit extends Motivair’s CDU range from 105kW to 3.5MW. Schneider says shipments will begin in selected regions in October 2026, with US pre-orders opening in early 2027.
The more consequential change is the scale at which liquid cooling is now being packaged. A multi-megawatt CDU moves the thermal boundary well beyond an individual rack or row. Cooling architecture is increasingly being designed at hall level alongside electrical distribution, rather than added once servers arrive.
