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Installation Guidelines

2.0 INSTALLATION GUIDELINES

2.1 Room Preparation

• Verify that the floor is level, solid and sufficient to support the unit. See Table 1 for unit weights.

• Confirm that the room is properly insulated and has a sealed vapor barrier.

• For proper humidity control, keep outside or fresh air to an absolute minimum (less than 5% of

total air circulated in the room).

• Do not install Liebert CW units in an alcove or at the end of a long, narrow room.

• Install the units as close as possible to the largest heat load.

• Allow at least the minimum recommended clearances for maintenance and service. See

Figures 2 through 17 for dimensions.

• Emerson recommends installing an under-floor water detection system. Contact your local Emer-

son representative for information.

2.2 Air Distribution—Downflow Units

• Verify that the raised floor has been properly sized for the unit’s airflow and the room is free of

airflow restrictions.

• Perforated floor tiles in the raised floor should ensure minimal pressure loss.

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

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

• Optional plenums are available for downflow unit ducting.

• If installing units with electrically commutated fans (EC fans), there must be 24" minimum clear-

ance below the unit to lower the fans. Fans may also remain the in unit if desired.

• A filter plenum is required for Liebert CW146 and CW181 units.

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.

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Emerson Liebert CW Manual de usuario Pagina 10