Technical Specifications

System Description
1
1.0 SYSTEM DESCRIPTION
The Liebert XD
™
family of cooling units delivers efficient, sensible cooling to high-heat environments.
Liebert XD systems are designed to cool computer racks and hot zones in a data center or computer
room without taking up expensive floor space for cooling components.
The Liebert XD family includes:
• Liebert XDC
™
—Liebert XD Chiller; cools and pumps refrigerant to cooling modules
• Liebert XDP
™
—Liebert XD Pumping unit; pumps refrigerant to cooling modules
• Liebert XDA
™
—mounts on the rear of the equipment cabinet
• Liebert XDCF
™
—Liebert XD CoolFrame; mounts on the rear of an Egenera BladeFrame EX
cabinet
• Liebert XDH
™
—Liebert XD Horizontal row cooler; integrated into hot aisle-cool aisle room
layout
• Liebert XDO
™
—Liebert XD Overhead module; suspended from the ceiling structure
• Liebert XDR
™
—Liebert XD Rear cooling module; mounts on the rear of equipment cabinets that
are 24" (600mm) wide and 42U high, approximately 79" (2000 mm)
• Liebert XDV
™
—Liebert XD Vertical module; mounted on top of the equipment cabinet or
suspended from the ceiling structure
Systems combining Liebert XDO, Liebert XDR and Liebert XDV modules can remove more than
20kW (5.7 tons) of heat per cabinet. A set of Liebert XDCF modules also can remove 20kW (5.7 tons)
of heat from an Egenera BladeFrame EX
™
cabinet. A system with Liebert XDH modules can remove
more than 30kW (8.5tons) of heat per rack.
For minimum Liebert XDP and Liebert XDC load recommendations, see 1.10.1 - Liebert XDP
Minimum Load; 1.9.1 - Liebert XDC Minimum Load; and Tables 71 and 75.
The Liebert XD system also performs at high efficiency rates. Properly spaced cooling modules and
the Liebert XD system’s fluid phase change technology, combine to reduce a Liebert XD system’s
energy consumption to at least 27 percent less than a traditional cooling system.
The Liebert XD family maintains this energy efficiency by employing the heat absorption properties
of a liquid (pumped refrigerant) through a phase change. Refrigerant is pumped as a liquid, becomes
a gas within the heat exchangers of the cooling modules (either the Liebert XDCF, Liebert XDH,
Liebert XDO, Liebert XDR or Liebert XDV) and then is returned to either the Liebert XDP or Liebert
XDC where it condenses to a liquid. This eliminates the compression cycle required by traditional
systems. And, if a leak were to occur, the environmentally friendly refrigerant in the data center
would escape as a gas, causing no harm to critical equipment. Because no compressor is used in the
pumped refrigerant circuit, no oil is needed.
Liebert XD cooling modules further increase efficiency with optional control board that reduces fan
use when maximum cooling levels are not required. The control board is available on Liebert XDH,
Liebert XDO and Liebert XDV modules.
1.1 European Union Fluorinated Greenhouse Gas Requirements
Stationary air conditioning, refrigeration, heat pump equipment and stationary fire protection
systems in the European Community market and operating with fluorinated greenhouse gases (f-
gas), such as R407C, R134a, R410A, must comply with the F-Gas Regulation: (EC) No. 842/2006 (F-
gas). The regulation prohibits, among other actions, venting fluorinated greenhouse gases to the
atmosphere.
The F-Gas Regulation requires operators to use all measures that are technically feasible and do not
entail disproportionate cost to prevent leakage of these gases, to test for leakage regularly and to
recover f-gas before disposing of equipment, as well as during service and maintenance.
Refer to the full regulation for additional details.