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System Description
2
1.1 European Union Fluorinated Greenhouse Gas Requirements
Stationary air conditioning, refrigeration, heat pump equipments and stationary fire protection sys-
tems 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 atmo-
sphere.
The F-Gas Regulation requires operators to use 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.
1.2 Direct and Indirect System Configurations
Liebert XD systems are available in Direct and Indirect configurations—differentiated essentially
by the method of heat rejection (see Figures 2 and 3). The indirect system uses a pumping unit con-
nected to a building chilled water system to control and circulate the refrigerant. In the direct system,
the pumping functions are incorporated in the chiller, which must be connected to a separate heat
rejection system.
Figure 2 Direct system configuration—hydraulic system diagram
Figure 3 Indirect system configuration—hydraulic system diagram
Pumped
Refrigerant
Supply Piping
Return Piping
Pumped
Refrigerant
Liebert XDC
Liebert XDC
Liebert XD
Cooling Module*
Liebert Heat
Rejection
Air Cooled or
Water/Glycol
Cooled
Liebert XD
Cooling Module*
Liebert XD
Cooling Module*
Liebert XD
Cooling Module*
* Liebert XDCF,
Liebert XDH, Liebert
XDO or Liebert XDV
Direct Liebert XD System Configuration
Pumping and control are performed by chiller.
Liebert
XDP
Liebert XD
Cooling Module *
Liebert XD
Cooling Module *
Building
Chilled
Water
Liebert
XDP
Liebert XD
Cooling Module *
Supply Piping
Return Piping
Pumped
Refrigerant
Pumped
Refrigerant
* Liebert XDCF,
Liebert XDH, Liebert
XDO or Liebert XDV
Indirect Liebert XD System Configuration
Liebert XDPs pump refrigerant to Liebert XDCF, Liebert XDH, Liebert XDO or Liebert XDV
modules, isolate refrigerant circuit from building chilled water supply with an internal
heat exchanger and maintains refrigerant temperature above the actual dew point.