Room Cooling

DA125, 125kW

The Liebert DSE is the industry's first pumped refrigeant economization system designed specifically for data centers. Ideal for companies seeking sustainable solutions, it provides up to 50% higher efficiency than traditional systems - and it uses no water. Its advanced controls automate economization to get the most free-cooling in any environment.

Best Suited For
  • Government
  • Banking, Financial and Insurance
  • Broadcast and Entertainment
  • Data Center/Colocation/Hosting
  • Professional Services
  • Telecom
One Year Limited Warranty Against Defects in Material and Workmanship
How to buy


The Liebert DSE is a free cooling economization system with backup DX compressor, that achieves the industry’s highest efficiency operation – up to 50% more efficient than legacy technologies. The Liebert DSE system was recently approved by the State of California as a prescriptive option for economization to be used to comply with Title 24, Part 6. The system includes several components – a pumped refrigerant economizer, a micro-channel condenser and an indoor CRAC unit. The system operates in free cooling or partial free cooling mode, depending upon outdoor temperatures. When criteria for economization are met, the compressors turn off and the refrigerant pump turns on to move the refrigerant through the system to reject the heat of the data center, using only a fraction of the power of a compressor. Automated economization, controlled by advanced Liebert iCOM controls, maximizes the number of free cooling hours by enabling economization whenever conditions warrant, even at night. It also eliminates the use of water. In contrast, a cooling system with a water economizer uses an average of 4 million gallons of water per year for a data center with an IT load of 1MW. Additionally, the Liebert DSE system protects against outside air contamination and reduces system wear and tear by eliminating air dampers and louvers. As a self-contained solution, Liebert DSE system is highly scalable. It also offers higher reliability than chilled water systems, because it does not use chillers, pumps, piping and other potential points of failure.

Specifications per model DA125, 125kW
TOTAL NOMINAL CAPACITY kBtuh[kW] NET SENSIBLE CAPACITY kBtuh [kW]* Nominal AIRFLOW [CFM] Height (in / mm) Width (in / mm) Depth (in / mm) Weight (lbs / kgs)
426.5 [125] 499 [146] 18,000 94 / 2388 144 / 3658 47 / 1194 3465 / 1572
* To view a specific model product page click on the model name above.
Total Capacity
499 [146]
Airflow Direction
Upflow and Downflow
Heat Rejection Medium
Capacity Modulation
Variable Speed EC Fans
Controls & Monitoring
Liebert iCOM Unit Control


Pumped Refrigerant Economizer
Advanced Thermal Controls
Microchannel Condenser
Independent Thermal System Design
 50-250kW capacities
 Upflow and downflow configurations (50kW unit with downflow only)


Minimizes compressor use to maximize free cooling
Eliminates need for bringing outside air and contanimants into the data center
Eliminates water usage, no costly water treatment required
Auto-economization increases the number of free-cooling hours throughout the year
No dampers and louvers to maintain
Industry-best condenser efficiency
N+1 thermal redundancy
Capacity can easily be scaled without affecting the rest of the cooling infrastructure, while maintaining desired redundancy
Lower refrigerant charge than traditional DX systems



All Liebert branded thermal management products come with technical support available by calling 1-800-543-2778.


Sales In USA Change Location
Gwyn Sales, Inc.
Email Contact +1 865 588 3147 Fax +1 865 675 2329
11230 Gilbert Drive Knoxville Tennessee 37932 USA
Product areas of focus: Uninterruptible Power Supplies (UPS), Power Distribution, Power Transfer Switches, Thermal Management, Integrated Solutions, Racks and Containment, Monitoring
Vertiv (Virginia Office)
Email Contact +1 804 747 6030 Fax +1 804 270 5703
1011 Technology Park Drive Glen Allen Virginia 23059 USA
Product areas of focus: Uninterruptible Power Supplies (UPS), Power Distribution, Power Transfer Switches, Thermal Management, Integrated Solutions, Racks and Containment, Monitoring
Support In Change Location
Vertiv (Liebert Services)
610 Executive Campus Drive Westerville Ohio 43082 USA
Product areas of focus: Uninterruptible Power Supplies (UPS), Power Distribution, Thermal Management, Integrated Solutions, Racks and Containment


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