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6.0 PIPING
6.1 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.
6.2 System Connection Configuration
If possible, connect the Liebert XDV modules to Liebert XDPs or Liebert XDCs in an interlaced config-
uration (see Figure 21). In an interlaced configuration, half the cooling units in an aisle are con-
nected to one Liebert XDP or Liebert XDC and the other half in that aisle are connected to another
Liebert XDP or Liebert XDC. Such interlaced piping will keep half the Liebert XDV units operating
and maintain even cooling in the conditioned space should one of the Liebert XDP or Liebert XDC
units fail.
However, in a system with just one Liebert XDP or Liebert XDC, connect Liebert XDV modules in a
non-interlaced configuration (see Figure 22).
Figure 21 Typical Liebert XDV piping—interlaced connections
Return A
Liebert
XDP/Liebert
Supply A
Return B
Liebert
XDP/Liebert
Supply B
Liebert XDV
A
Liebert XDV
B
Liebert XDV
A
Liebert XDV
B
Liebert XDV
B
Liebert XDV
A
Liebert XDV
B
Liebert XDV
A
TOP VIEW—NOT TO SCALE
NOTE: Line size does NOT
indicate pipe size difference.