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Document Number Title

Plenumsfor UnitswithECFans

DPN004604 PlenumDimensional Data, DownflowModels, CW038toCW084

DPN004605 Plenum Dimensional Data, DownflowModels, CW106andCW114

DPN003214 Plenum Dimensional Data, UpflowModels, CW038toCW084

DPN003213 PlenumDimensional Data, UpflowModels, CW106andCW114

Plenumsfor UnitswithForward-curvedBlowers

DPN003204 PlenumDimensional Data, UpflowModels, CW038toCW084

DPN003205 Plenum Dimensional Data, UpflowModels, CW106andCW114

Table 3.1 Dimension Planning Drawings (continued)

2.2 Location Considerations

For a downflow unit, the unit cansit onanaccessible, elevated flooring system. It may be necessary tofurnishadditional

pedestal support belowthe unit to ensure maximum structural support. A separate floor stand for the unit may be used as

support, independent of the elevated floor and installed prior to the flooring system.

For downflow and upflow units, provide approximately 34in. (864mm) service clearance onthe left, right and infront of the

unit whenever possible. The minimum space required for service is 18in.(457mm) onthe left end, 18in.(457mm) onthe

right end and 24in.(610mm) infront of the unit. This space isnecessary to permit routine maintenance, suchas replacing

filters and adjusting the fan speed. Ondownflow and upflow CW106 and CW114 models, left- and right-end minimum

clearances are 0in.(0mm) except for rear return.

Avoid installing units inan alcove or at the extreme end of a room that has a high aspect ratio (long narrow room). Also

avoid installing units too close together. Thistends to reduce the effectiveness of the air distributionas compared to units

located 30to40ft(9to12mm) apart.

2.3 Air-distribution Considerations for Downflow Units

• Verify that the raised floor has beenproperly sized for the unit’s airflowand the room isfree of airflow

restrictions.

• Perforated floor tiles inthe raised floor should ensure minimal pressure loss.

• The raised floor must provide 7-1/2in. (191mm) of clearance.

• Ensure that there is adequate clearance above the unit for service, such as replacing filters.

• Optional plenums are available for downflowunit ducting.

• If installing units with electrically-commutated fans (EC fans), there must be 24in. minimum clearance below

the unit tolower the fans. Fans may also remain the inunit if desired.

• A filter plenum is required for the following units: CW146, CW181, CW300, CW400.

NOTE: The floor stand used with EC units is not symmetrical and its orientation to the Liebert® CW is

critical to lowering the EC fans. Unless the floor stand is installed in the correct position, the blowers

will not lower into the floor stand.

2Pre-installation PreparationandGuidelines

Vertiv Liebert CW Series User Manual

Questions and Answers: