What is the Vertiv Liebert XDU 1350?
The Liebert XDU 1350 is a liquid-to-liquid coolant distribution unit (CDU) for direct-to-chip cold plates or rear-door heat exchangers. Its plate heat exchangers keep facility water separate from a smaller, controlled technology loop near the information-technology equipment. Vertiv rates nominal cooling at 1,368 kW with a 4°C approach-temperature difference. It publishes a higher maximum at a larger temperature difference, which shows why the headline is not independent of duty conditions. Available heat rejection falls when the two loops must run closer together, while glycol, fouling, and site pipe losses affect flow and pump margin. Vertiv lists water or water-glycol on both sides, a 10–52°C secondary range with dew-point control, and two- or three-pump configurations. Published guides also describe optional dual power, filtration choices, and top or bottom connections. Buyers should select against the official application guide, not the model number. Confirm required flow and external differential pressure at the site's full and partial loads, then check primary pressure loss and electrical demand. Verify fluid chemistry, material compatibility, flange locations, floor loading, service access, controls, alarms, and integration with rack manifolds. Ask what is redundant in the ordered configuration and whether maintenance can occur online. The public data does not approve any particular server or cold plate; that requires a complete loop review with the information-technology and cooling suppliers.