Liquid-air cooling distribution unit CDU-LTA Rack

rack-mountfor data centers

Product overview The EXTRCOOL Rack‑Mounted Liquid‑to‑Air (LTA) Cooling Distribution Unit (CDU) is a compact 4U/6U rack solution that integrates liquid‑to‑air heat rejection, pumps and controls for high‑density data center liquid cooling. Engineered for compatibility with NVIDIA GB200/GB300 and high‑power GPU servers, the CDU enables space‑efficient liquid cooling deployments and retrofit upgrades without chilled‑water infrastructure.

Core technical advantages

• Standard rack form factor 4U/6U design installs directly in server racks to minimize floor space and simplify piping to server cold plates.
• Direct liquid‑to‑air heat rejection Rejects loop waste heat to ambient air, removing the need for centralized chilled‑water systems.
• Plug‑and‑play integration Preconfigured piping, pumps and control interfaces speed connection to rack manifolds and cold plates, reducing on‑site commissioning.
• Smart variable‑speed control Fan and pump speeds adapt to coolant temperature to limit power draw and improve data center PUE.
• Enterprise reliability Factory pressure testing, leak detection and 1+1 pump redundancy provide continuous operation for mission‑critical racks.

Product specifications Product Type: Liquid‑to‑Air Cooling Distribution Unit (L2A CDU)
Brand: EXTRCOOL
Model Series: CDU‑LTA Rack Series
Part Numbers: EXT‑CDU6AR | EXT‑CDU15AR | EXT‑CDU24AR | EXT‑CDU30AR
Installation Type: In‑rack (4U / 6U)
Rated Cooling Capacity: 6 kW | 15 kW | 24 kW | 30 kW
Coolant: PG25
Operating Environment (T & H): -10°C ~ 55°C / RH 5%~90%
Storage Environment (T & H): -45°C ~ 70°C / RH 5%~93%
Display: 4.3" | 4.3" | 7" | 7"
Approach Temperature: 10°C
Primary side air/liquid temp. (in/out): 25°C / 35°C
Secondary side liquid temp. (out/in): 35°C / 45°C
Secondary side rated flow rate: 10 LPM | 25 LPM | 40 LPM | 50 LPM
Power Supply: AC 220V 50/60Hz
Dual power ATS: Yes
Leak Detection: Yes
Redundant Pump Automatic Switchover: 1+1
Power Consumption: <0.3 kW | <1 kW | <1.5 kW | <3 kW
Bypass Online Replaceable Filter: No
Control Type: PID control; adjusts air volume and flow rate by temperature
Communication: Modbus RTU & TCP/IP
Approx. Weight: 40 kg | 75 kg | 105 kg | 135 kg
Protection Level: IP55
Dimensions (W x D x H) mm: 482 x 870 x 177.8 | 482 x 870 x 443 | 482 x 870 x 665 | 482 x 870 x 887

Ideal application scenarios

• Traditional data center retrofit: Cost‑effective liquid cooling upgrade for air‑cooled facilities without chilled‑water systems.
• Medium‑to‑high power density racks: Supports 15–30 kW rack loads for AI training servers and HPC clusters.
• Edge and colocation sites: Compact rack‑mount format fits constrained footprints.
• Hybrid liquid cooling architectures: Enables phased rollouts combining air‑cooled and liquid‑cooled racks.
• Small‑to‑mid scale AI clusters: Simplified, low‑maintenance cooling for small GPU deployments.

Frequently asked questions

• 1. What is a rack‑mounted LTA CDU used for? It rejects waste heat from rack liquid loops directly to ambient air, removing external heat‑rejection infrastructure and simplifying deployment.
• 2. Why choose rack‑mounted vs. standalone CDU? Rack‑mounted units reduce piping complexity and floor space, arrive factory‑tested and shorten on‑site commissioning.
• 3. Is the CDU compatible with server cold plates? The CDU supports standard loop pressures and temperatures and offers configurable flange connections; verify compatibility with specific cold plate/manifold designs.

Technical specifications (summary)

• Brand: EXTRCOOL
• Model Series: CDU‑LTA Rack Series
• Product Type: Rack‑mounted liquid‑to‑air CDU (L2A)
• Form Factor: 4U / 6U
• Rated Capacities: 6 / 15 / 24 / 30 kW
• Coolant: PG25
• Secondary Flow Rates: 10–50 LPM (model dependent)
• Power: AC 220V 50/60Hz
• Control & Communication: PID; Modbus RTU & TCP/IP
• Protection: IP55
• Leak Detection & Redundant Pump: Yes; 1+1
• Origin: Guangdong, China