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5.0 PIPING
5.1 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.
5.2 System Connection Configuration
If possible, connect the Liebert XDH’s upper and lower refrigeration circuits to Liebert XDPs or Lie-
bert XDCs in an interlaced configuration (see Figure 11). Interlacing the connection piping will keep
one of the Liebert XDH’s circuits operating 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 XDH modules in a
non-interlaced configuration (see Figure 12).
Figure 11 Typical Liebert XDH piping—interlaced connections
Liebert XDP /
Liebert XDC #1
Supply
Liebert XDP/
Liebert XDC #1
Drawing is not to scale.
Line sizes do NOT indicate
piping sizes.
Equipment racks not shown
for clarity.
Liebert
XDH
Unit 1
Liebert
XDH
Unit 2
Liebert
XDH
Unit 3
Liebert
XDH
Unit 4
Liebert XDP /
Liebert XDC #2
Liebert
XDH
Unit 5
Liebert
XDH
Unit 6
Liebert
XDH
Unit 7
Liebert
XDH
Unit 8
Return
Liebert XDP/
Liebert XDC #1
Return
Liebert XDP/
Liebert XDC #2
Supply
Liebert XDP/
Liebert XDC #2