Emerson Liebert CW Bedienungsanleitung PDF herunterladen (Seite 12)

Installation Guidelines

2.4 Connections and System Setup

• Plan the routing of wiring, piping and ductwork to the unit. See Figures 27 through 33 and

Figures 35 through 45 for unit connection locations.

• The unit requires a drain, which must comply with all applicable codes. This drain line may con-

tain boiling water. See 7.1.1 - Condensate Piping—Field-Installed for details.

• Three-phase electrical service is required for all models. Electrical service must conform to

national and local electrical codes. See the equipment nameplate for details.

• If seismic requirements apply, consult your local Emerson representative for information about a

seismic-rated floor stand.

2.5 Operating Conditions

• The Liebert CW should be operated in a conditioned space within the operating envelope

ASHRAE recommends for data centers: Maximum temperature of 77°F (25°C) DB and 55% RH or

maximum WB of 65.5°F (18.6°C).

• Return air to the unit must be no cooler than the ASHRAE recommendation of 68°F (20°C) DB

and 40% RH or minimum WB of 54°F (12.2°C) for proper unit operation. Operating below this can

decrease equipment reliability.

Refer to the ASHRAE publication, “Thermal Guidelines for Data Processing Environments.”

2.6 Location Considerations

For a downflow unit, the unit can sit on an accessible, elevated flooring system. It may be necessary to

furnish additional pedestal support below the 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" (864mm) service clearance on the left,

right and in front of the unit whenever possible. The minimum space required for service is

18" (457mm) on the left end, 18" (457mm) on the right end and 24" (610mm) in front of the unit. This

space is necessary to permit routine maintenance, such as replacing filters and adjusting the fan

speed. On downflow chilled water units and upflow CW106 and CW114 models, left- and right-end

minimum clearances are 0" (0 mm), with the exception of rear return.

Avoid installing units in an 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. This tends to reduce the effectiveness of

the air distribution as compared to units located 30-40 feet (9-12m) apart.

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Emerson Liebert CW Bedienungsanleitung Seite 12