Liquid cooling system EXT-CDU6AR

glycol waterdata centerrack-mount

Product Overview
The EXTRCOOL Rack-Mounted Liquid-to-Air (LTA) Cooling Distribution Unit (CDU) is a compact 4U/6U rack-integrated solution for high-density data center liquid cooling. Engineered for AI GPU servers (NVIDIA GB200/GB300 compatibility) and high-power server cold-plate loops, the unit combines direct liquid-to-air heat rejection, pumps and intelligent controls in a standard rack form factor to simplify deployment and avoid chilled-water infrastructure.

Core Technical Advantages

• Standard Rack Form Factor 4U/6U design fits into standard server racks for space-efficient deployment and simplified piping to rack cold plates.
• Direct Liquid-to-Air Heat Rejection Rejects heat from coolant loops directly to ambient air, removing dependence on facility chilled-water systems.
• Plug-and-Play Integration Pre-configured piping, pumps and control interfaces reduce on-site commissioning time and integration complexity.
• Smart Variable-Speed Operation Fan and pump speeds adjust to coolant temperature to reduce power draw and improve overall data center efficiency (lower PUE).
• Enterprise-Grade Reliability Factory pressure-tested components, reinforced seals, leak detection and 1+1 pump switchover support continuous operation for mission-critical workloads.

Ideal Application Scenarios

• Data Center Retrofit Cost-effective liquid cooling upgrade path for air-cooled facilities without chilled water.
• Medium-to-High Power Density Racks Supports rack loads from 15–30 kW for AI training servers and HPC clusters (models available from 6 kW).
• Edge & Colocation Sites Compact rack-mount footprint suits space-constrained environments.
• Hybrid Cooling Architectures Enables phased rollouts combining air-cooled and liquid-cooled racks.
• Small-to-Mid-Scale AI Clusters Simplified, low-maintenance liquid cooling for smaller GPU deployments.

Product Specifications
Brand: EXTRCOOL
Model Series: CDU-LTA Rack Series
Cooling Type: Liquid-to-Air (LTA) direct heat rejection
Product Category: Rack-Mounted Cooling Distribution Unit
Form Factor: 4U / 6U standard rack
Compatible Systems: Server cold plate loops, rack-level liquid cooling manifolds
Place of Origin: Guangdong, China

Detailed Technical Data (per model)
Part Numbers: EXT-CDU6AR / EXT-CDU15AR / EXT-CDU24AR / EXT-CDU30AR
Product Type: Liquid-to-Air Cooling Distribution Unit (L2A CDU)
Installation Type: In-rack
Rated cooling capacity: 6 kW / 15 kW / 24 kW / 30 kW
Coolant: PG25
Working environment (T & H): -10°C ~ 55°C / RH 5% ~ 90%
Storage environment (T & H): -45°C ~ 70°C / RH 5% ~ 93%
Display screen (inch): 4.3" / 4.3" / 7" / 7"
Approach temperature: 10°C
Primary side air or 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 fan speed and flow rate according to 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

Frequently Asked Questions
1. What is a rack-mounted LTA CDU used for? A rack-mounted LTA CDU rejects heat from liquid cooling loops to ambient air within the rack, eliminating external heat rejection infrastructure and simplifying deployment.
2. What are the benefits versus a standalone CDU? Rack-mounted CDUs save floor space, reduce piping complexity, and are pre-tested at factory to minimize on-site installation issues.
3. Is the unit compatible with all server cold plate systems? The CDU supports standard loop pressures and temperatures and offers configurable flange connections to match most server cold-plate and manifold systems.

Technical Specifications

• Brand: EXTRCOOL
• Model Series: CDU-LTA Rack Series
• Product Type: Liquid-to-Air Cooling Distribution Unit (L2A CDU)
• Form Factor: 4U / 6U rack-mount
• Rated capacities (models): 6 kW / 15 kW / 24 kW / 30 kW
• Part Numbers: EXT-CDU6AR, EXT-CDU15AR, EXT-CDU24AR, EXT-CDU30AR
• Coolant: PG25
• Secondary flow rates: 10 LPM / 25 LPM / 40 LPM / 50 LPM
• Power Supply: AC 220V 50/60Hz; Dual power ATS: Yes
• Control: PID control; Communication: Modbus RTU & TCP/IP
• Leak detection: Yes; Redundant pump: 1+1 automatic switchover
• Power consumption (per model): <0.3 kW / <1 kW / <1.5 kW / <3 kW
• Protection level: IP55
• Approx. Weight (per model): 40 kg / 75 kg / 105 kg / 135 kg
• Dimensions (W x D x H) mm (per model): 482 x 870 x 177.8 / 482 x 870 x 443 / 482 x 870 x 665 / 482 x 870 x 887
• Operating environment: -10°C ~ 55°C / RH 5% ~ 90%
• Storage environment: -45°C ~ 70°C / RH 5% ~ 93%