Coolant Distribution Units provide a secondary loop of heat rejecting liquid, isolating racks from the building chilled water supply while providing key management features. These units circulate liquid above the room dew point, ensuring 100% sensible cooling, and have manifolds to connect multiple Rear Door Heat Exchanger units. Redundant pumps and fault-tolerant controls maximize system availability. 120kW Floor-mount and 20kW Rack-mount models Microprocessor controls and web management Built-in reservoir and automatic fill system