Vertiv Liebert PDX Perimeter DX Cooling: Specs and Service
The Vertiv Liebert PDX is a high-efficiency perimeter direct-expansion (DX) cooling system for data centers and server rooms, with capacities from about 15 to 165 kW. It uses digital scroll compressors and EC fans for scalable, efficient cooling and integrates with iCOM controls. Comp-Utility, a long-standing Vertiv distribution partner, specs, installs, and services the Liebert PDX across Central Texas.
What We Provide
Our Capabilities
Spec and Size Cooling
We size Liebert PDX units to your heat load and room, configuring up-flow or down-flow for your raised-floor or slab design.
Learn moreInstallation and Commissioning
We install, pipe, and commission DX cooling and verify it holds temperature and humidity tolerances under load.
Learn moreMaintenance and Service
Preventative maintenance and 24/7 response keep the PDX efficient and reliable through the Texas summer.
Learn moreEfficient DX Cooling
Digital Scroll and EC Fans for Scalable Capacity
The Liebert PDX uses digital scroll compressor modulation and EC Fans to match cooling output to the actual heat load, improving efficiency at partial load, which is where data centers spend most of their time.
As a perimeter DX system, it does not require a chilled-water plant, making it a practical choice for server rooms and small to mid-size data centers.
Key Specifications
| Attribute | Vertiv Liebert PDX |
|---|---|
| Type | Perimeter direct expansion (DX) |
| Capacity | 15 to 165 kW |
| Airflow | Up-flow or down-flow |
| Key features | Digital scroll compressors, EC Fans, hydrophilic coil |
| Controls | iCOM |
| Typical applications | Data centers, server rooms, telecom |
Specifications reflect the Liebert PDX product line; exact capacities and configurations vary by model. Contact us to confirm the current configuration for your project.
The Comp-Utility Difference
Why Comp-Utility?
Long-Standing Distribution Partner
As a long-standing distribution partner of Eaton, Schneider Electric, and Vertiv, we specify best-in-class systems and back them with factory-grade service.
Engineer-Owned and Operated
Comp-Utility is owned and operated by engineers, with licensed Texas Professional Engineers (P.E.) on staff. That rigor anchors every design, specification, and installation.
Turnkey, Single-Contract Partner
We sell, design, install, and maintain complete infrastructure end to end. One accountable team and one contract for power, cooling, distribution, and cabling.
24/7 Emergency Response and Preventative Maintenance
Our technicians provide preventative maintenance programs and 24/7 emergency response, with rapid on-site dispatch across Central Texas when facilities need us most.
Related Resources
Licensed, Certified & Recognized
We hold ourselves to the standards of the institutions we serve, from professional licensure and jobsite safety to the industry organizations that set the bar for mission-critical work.
Licensed Professional Engineers
State of Texas (TBPE)
OSHA 30 Certified
Field Technicians
AFCOM Member
Data center industry association
7x24 Exchange Member
Mission-critical infrastructure
Frequently Asked Questions
What is the Vertiv Liebert PDX?
The Liebert PDX is a perimeter direct-expansion (DX) precision cooling system for data centers and server rooms, with capacities from about 15 to 165 kW. It uses digital scroll compressors and EC fans for efficient, scalable cooling and holds tight temperature and humidity tolerances. It does not require a central chilled-water plant.
What is the difference between DX and chilled-water cooling?
DX cooling like the PDX uses a refrigerant-based system with compressors at the unit, while chilled-water cooling uses water cooled by a central plant. DX is well suited to server rooms and small to mid-size data centers without a chilled-water loop, while chilled water often makes sense at larger scale. Comp-Utility helps choose the right approach.
How efficient is the Liebert PDX?
The PDX improves efficiency through digital scroll compressor modulation and EC fans, which match cooling output to the actual heat load rather than running at full output continuously. Since data centers usually operate below peak load, this part-load efficiency meaningfully reduces energy use compared with fixed-capacity units.
How do I size precision cooling for my data center?
Cooling is sized to the IT heat load in kW plus margins for redundancy and future growth, accounting for room layout and airflow. Redundancy such as N+1 is standard for critical spaces. Comp-Utility calculates the heat load, recommends the unit count and capacity, and designs airflow and containment to deliver cooling where it is needed.
Can the PDX be configured for redundancy?
Yes. Multiple PDX units are commonly deployed in an N+1 or greater configuration so the room stays within tolerance if a unit fails or is serviced. Comp-Utility designs the cooling redundancy to match your data center tier and uptime goals and coordinates it with your power redundancy.
Is the PDX suitable for the Central Texas climate?
Yes. Comp-Utility sizes and configures cooling for Central Texas peak ambient conditions so units hold tolerances during the hottest part of the year. Proper sizing, heat rejection selection, and maintenance are essential in this climate, and we design and service the system with that in mind.
Who installs and services the Liebert PDX in Central Texas?
Comp-Utility, a long-standing Vertiv distribution partner, specs, installs, commissions, and maintains the Liebert PDX across Central Texas, including preventative maintenance and 24/7 emergency response. Call (512) 346-0999 or email sales@comp-utility.com.
What maintenance does the PDX require?
Precision cooling like the PDX needs regular filter changes, coil cleaning, refrigerant and compressor checks, EC fan inspection, condensate management, and controls and setpoint verification. Regular service preserves efficiency and prevents failures. Comp-Utility provides scheduled maintenance, commonly quarterly or semi-annually, based on the environment.