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Installation Guidelines

2.3 Air Distribution—Upflow Units

Various configurations are available:

• Front return

• Rear return

• Bottom return (not available on CW106 and CW114 models)

For in-room applications with supply and return grilles, several feet of clearance must be maintained

at the intake and discharge of the unit. For a bottom return, at least 6-8 inches of unrestricted under-

floor height is needed.

Upflow rear-return configurations use a filter box attached to the back of the Liebert CW. Allow 25"

(635 mm) on one side of the unit for access to the rear return filter box. Refer to the filter box installa-

tion sheet, which can be found inside the rear return filter box package.

For ducted applications, duct flanges are supplied on the blower outlets. Follow the SMACNA-Duct

Construction Standard for single-, dual-, or triple-blower systems. Do not run ductwork off the perim-

eter flange on the top of the unit. This flange is for positioning and attaching the optional air dis-

charge plenum with grille. Attaching a duct to this flange may reduce airflow to inadequate levels.

Figure 1 Upflow ducting configurations

WARNING

Risk of high-speed moving parts. Can cause injury or death. Disconnect all local and remote

electric power supplies and make sure blowers and pulleys have stopped rotating before

working in the unit.

Do not operate upflow units without installing a plenum, ductwork or guard over the blower

opening(s) on the top surface of the unit cabinet.

Ductwork must be connected to the blower(s), or a plenum must be installed on the blower

deck for protection from rotating blower wheel(s) on upflow units.

NOTE

Drain traps are qualified to a return duct static of negative 1.5 i.w.g. (-1.5 i.w.g).

DPN001156

Rev. 0

* Follow standard practices on all duct work.

Straight section of duct off of unit to be 1.5 to 2.5 times

the longest blower dimension.

Typical ducting shown; ducting may run to either side.

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Emerson Liebert CW Bedienungsanleitung Seite 11