• Keep piping clean and dry, especially on units with R-410A refrigerant.
• Avoid piping runs through noise-sensitive areas.
• Do not run piping directly in front of discharge air stream.
• Refrigerant oil – do not mix oil types (see Compressor Oil).
Refer to ASHRAE Refrigeration Handbook for general, good-practice refrigeration piping. The indoor cooling unit has a
factory installed high pressure safety switch in the high side refrigerant circuit. A fusible plug is installed in each Liebert®
DSE receiver.
NOTE: All indoor and outdoor field refrigerant piping must be insulated 1/2 in. minimum. All outdoor insulation must
be UV and ozone resistant.
• Refer to Refrigerant Line Sizes and Equivalent Lengths below, for recommended refrigerant piping sizes based
on equivalent pipe lengths.
• Refer to Refrigerant Charge Requirements for Air Cooled Systems on the facing page, for the refrigerant-charge
requirements of the system.
• Refer to Charging DA250 Air Cooled Systems (Liebert® MCV440 with Receivers) on page33, for charging
information.
6.2.2 Piping Layout and Condenser Positioning
The piping layout and condenser positioning is detailed in the submittal documents included in the Submittal Drawings.
The following table lists the relevant documents by number and title.
Document Number Title
DPN003965 Liebert® DSE Air Cooled Piping Schematic Liebert® MCV Mounted above Liebert® DA125-250
DPN005207 Liebert® DSE Air Cooled Piping Schematic Liebert® MCV Mounted above DA265
Table 6.5 Refrigeration Piping Layout and Condenser Positioning Drawings
6.2.3 Refrigerant Line Sizes and Equivalent Lengths
Model
DA250
DA265
Equivalent Length Hot Gas Line, in. Liquid Line, in.
50 ft. (15 m) 1-5/8 1-3/8
100 ft. (30 m) 1-5/8 1-3/8
150 ft. (45 m) 1-5/8* 1-3/8*
300 ft. (91 m) 1-5/8* 1-3/8*
*The DA250 and DA265 units can be extended to a maximum 200 ft (61m) linear or 300 ft (91m) equivalent length.
Source: DPN000788 Rev. 13
Table 6.6 Recommended Refrigerant Line Sizes, OD Copper
NOTE: See the piping schematics for your system in Submittal Drawings. For installations using pre-fabricated heat
rejection skids, included piping must be factored into total equivalent length calculation. Please consult factory for
details.
Vertiv | Liebert® DSE Thermal Management System Installer/User Guide
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