Room Cooling

DA250 , 250kW

The Liebert DSE 250 provides new levels of performance for colocation and cloud hosting facilities, with rapid deployment, low cost of ownership, high energy efficiency and low peak power. The system is ideal for raised or non-raised floor data centers. Its pumped refrigerant economizer uses no water and requires no outside air into the data center. A packaged condenser and refrigerant pump can be rooftop mounted, making it ideal for multi-story buildings.

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 in 250kW capacity is a free cooling economization system with backup DX compressor, which achieves the high efficiency without using water. The system can achieve an annual operational PUE under 1.2., while eliminating water usage, cost and treatment. Its large condenser surface area minimizes operating and peak power to minimize generator backup or free up additional saleable IT power. Unlike heat wheels, it has no air leakage or volumetric displacement, eliminating the need for additional fan power or make-up air capacity. As a self-contained solution, Liebert DSE system is highly scalable for fast deployment and time to market. The Liebert DSE 250kW is comprised of a packaged pumped refrigerant economizer and a micro-channel condenser, plus 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 the advanced Liebert iCOM control, maximizes the number of free cooling hours by enabling economization whenever conditions warrant, including evening and night-time hours. It also eliminates the use of water. The Liebert DSE system was recently approved by the State of California as a prescriptive option for economization under Title 24. Additionally, the system protects against outside air contamination and reduces system wear and tear by eliminating air dampers and louvers.

Specifications per model DA250 , 250kW
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)
853 (250) 853 (250) 37,000 132 3/4 / 3371 120 1/4 / 3055 83 5/8 / 2126 6470 / 2935
* To view a specific model product page click on the model name above.
Total Capacity
853 (250)
Net Sensible Capacity
853 (250)
Nominal Airflow
Airflow Direction
Front and Bottom Discharge
Heat Rejection Medium
Controls and Monitoring
Liebert iCOM unit controls
Agency Approvals
AHRI Certified
Key Components
CRAC, Packaged Condenser/Refrigerant Pump


Uses a pumped refrigerant economizer and automated transitions to economization to cut energy usage
Units can be situated side by side to form a fan array to support loads of more than 250 watts per square foot, with servicing at the back 
Slab coil design and top-to-front airflow make it ideal for slab floor data centers. Underfloor airflow is also available.


Saves You Money
High-efficiency pumped refrigerant economizer uses less than one-tenth the power of compressors
Annual operational PUE under 1.2
Eliminates water usage, cost, and treatment
 Large condenser surface area minimizes operating and peak power to minimize  generator backup or free up additional saleable IT power.
No air leakage or volumetric displacement, eliminating the need for additional fan power or make-up air capacity
Rapidly scalable for faster deployment and time to market
Low operating costs for higher profitability. Highly efficient in low load / part load conditions
Lowers Your Risks
Proven pumped refrigerant economization technology used in more than 4,000 installations worldwide
Multiple fans, DX circuits and other key components for ride-through 
No air dampers or louvers to maintain
Airflow up to 37,000 CFM supports lower delta-T in non-raised floor environments. 
Supports large, high-density data center suites requiring a low-complexity infrastructure.
No outside air, contaminants or humidity allowed into the data center
Simplified Thermal Management
Advanced monitoring and control algorithms for multi-unit teamwork, automated transitions to economization and automated protection routines for unit lead/lag, coil freeze, and others.  
Rear-access servicing means no need for mechanical service in the data center
Refrigerant pump is virtually maintenance free
​No dampers to service or outside air filters to replace

Services & Support


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


Sales In Virginia, 20149, USA Change Location
Vertiv (Capital Office)
44611 Guilford Dr Ste 180 Ashburn Virginia 20147 USA
Product areas of focus: Uninterruptible Power Supplies (UPS), Power Distribution, 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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