Air-Cooled Centrifugal Chillers for Mission-Critical Cooling
Deliver mission-critical cooling without the complexity of conventional oil systems. Gradian’s air-cooled centrifugal chiller combines 550 tons of cooling capacity with oil-free Aero-Lift compressor technology, rapid restart, and flexible chilled water operation for demanding data center environments.
550 Tons Cooling Capacity
Sub 1 Minute Restart
Up to EWT 55C and LWT 45C
Oil-Free Aero-Lift™ Centrifugal Compressors
What makes a Gradian Centrifugal Chiller?
Oil-Free Aero-Lift™ Compressor Technology
Copeland oil-free centrifugal compressors self-levitate the shaft without oil lubrication, electromagnetic bearings, proximity sensors, or active bearing controls, eliminating an entire category of mechanical complexity and its associated maintenance.
Rapid Restart
Get cooling back online, fast. Minimize downtime and utility disruptions with a rapid restart of less than 1 minute.
Wide Chilled Water Temperature Range
Supports chilled water temperatures up to 90°F, along with high-lift, 2-stage compressor technology that maintains performance at full load or low turndown even under demanding ambient conditions.
Technical specifications
| Cooling Capacity | 550 Tons |
|---|---|
| Refrigerant | R-513A |
| Circuits / Compressors | 2 circuits, 2 compressors per circuit (4 total) |
| Capacity Modulation | Variable Frequency Drive (VFD) |
| Turndown | 5:1 |
| Evaporator Type | Shell-and-Tube, Flooded |
| Condenser Coils | Micro-Channel |
| Controls Tolerance | ±1°F |
| Power Supply | 460V / 3-Phase / 60Hz — SCCR 65kA |
|---|---|
| Power Consumption | 466 kW |
| Controller | Carel pco5 |
| Communication | BACnet IP/MS-TP, Modbus TCP/IP and RTU |
| Dimensions | 633"L x 95"W x 100"H |
|---|---|
| Weight (Shipping / Operating) | 224,880 lbs / 236,120 lbs |
Downloads
Cut Water Out of the Equation
Water availability is increasingly deciding where AI infrastructure is being built. Air-cooled architecture removes cooling towers, condenser-water pumps, and water treatment from the equation entirely. Now the site's water situation stops being part of the cooling conversation.
Air-Cooled Condensers - Reject heat directly to air, no cooling tower or evaporative process required.
No Water Treatment System - Remove the chemical treatment and upkeep a cooling tower requires.
Unlock Sites Water Constraints Would Otherwise Rule Out - Build where water permitting, availability, or sustainability requirements would limit a water-cooled plant.
Less Maintenance. More Uptime
Mission-critical cooling shouldn't come with another maintenance-intensive piece of rotating equipment. Oil-free Aero-Lift™ compressor technology removes the oil system entirely, without adding the magnetic-bearing sensing and backup hardware that other chillers require.
No Oil System - Eliminate oil pumps, filters, separators, and routine oil service.
Improved Reliability - No magnetic-bearing sensing, redundant backup bearings, or capacitor to manage.
Independently Serviceable Components - Service compressors, drive, and controls independently, reducing downtime and reliance on specialized factory technicians.
Get Back Online in Under a Minute
When utility power drops and generators take over, you need cooling infrastructure that gets to work fast. Sub-1-minute restart gets cooling capacity back online while the rest of the facility is still stabilizing.
Sub-1-Minute Restart - Restore cooling quickly following a utility or generator event.
Reduced Recovery Risk - Shorten the window IT load runs without full cooling capacity.
Built for Mission-Critical Operation - Designed for environments where even short interruptions carry real risk.
Questions, answered.
An oil-free centrifugal chiller removes the conventional oil-lubrication system entirely. Gradian Air-Cooled Centrifugal Chillers use Aero-Lift™ compressor technology, where the compressor shaft self-levitates without oil, electromagnetic bearings, or active bearing controls — eliminating oil pumps, filters, separators, and their associated maintenance.
