Figure 5.6 Floor cutout dimensions, unit with aluminum profile, width 23-5/8" (600mm)
5.4 Insulation
Insulate all piping for the Liebert DCD to minimize the possibility of condensation.
5.5 Chilled Water Distribution Units
Utilizing a chilled water distribution unit provides these benefits:
• Isolation of the building’s chilled water circuit from the chilled water circuit within the data
center. The Liebert DCP™ circulates the chilled water to Liebert DCD while preventing
condensation by maintaining the water temperature above the room dew point.
• Ensures that the proper flow rate to the Liebert DCD is occurring. This is a critical factor in
achieving and maintaining the needed capacity.
• Separation of the data center from the building chilled water circuit also minimizes the impact
of a leak within the data center. Should a leak occur within the data center, the volume of water
is limited to the amount within the secondary piping system instead of the entire building
chilled water system.
5.5.1 Recommended Pipe Size
Elbows and restrictions should be minimized to establish sufficient fluid flow.
Piping Run Nominal Pipe Size, inches
Supply or Return Mains 2-5/8
Supply or Return Branches >10 ft 1-3/8
Supply or Return Branches <10 ft 1-1/8
Table 5.1 Recommended pipe sizes
5.6 Open Loop Chilled Water Systems
Maintaining the proper chilled water flow rate is critical in achieving the Liebert DCD’s design capacity. If a
chilled water distribution unit, such as the Liebert DCP™, is not being used, steps must be taken to ensure
the proper flow at the unit is maintained.
Vertiv | Liebert® DCD™ User Manual | 36
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