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2.2 Connections and System Setup
•
The unit requires a drain, which must comply with all applicable codes. This drain line may
contain boiling water. See
details.
•
The unit requires supply and return water connections, which must comply with all applicable
codes. See
•
If seismic requirements apply, consult your Vertiv representative for information about a
seismic-rated floor stand.
2.3 Operating Conditions
The Liebert® CW must be operated in a conditioned space within the operating envelope that ASHRAE
recommends for data centers. Operating the CW outside of this envelope can decrease equipment
reliability. Refer to ASHRAE's publication, "Thermal Guidelines for Data Processing Environments."
The recommended maximum for return-air temperature is 105°F (40°C) and maximum dew point is 59°F
(15°C). The recommended minimum return-air temperature setpoint for the CW is 85°F (29.4°C).
2.3.1 Cooling, Dehumidification and Humidification
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.
2.3.2 Humidification Control
The humidifier option is not available on the CW305, CW375, CW415. A remote humidifier contact is
available for a stand-alone humidifier.
2.4 Shipping Dimensions and Unit Weights
Table 2.2 Downflow unit domestic and export shipping dimensions and weights
Model #
Ship Weight, lb
(kg)
CW305
CW375
3890 (1764)
CW415
Fan
3000 (1361)
section
12
Field-installed, Gravity-fed Drain Line Requirements
Piping Requirements
on page 23.
Domestic Packaging
Shipping Dimensions, in.
(mm)
70 x 154 x 96.8
(1778 x 3911 x 2458)
90 x 128 x 54
(2286 x 3251 x 1372)
Export Packaging
Ship Weight, lb
Shipping Dimensions, in.
(kg)
(mm)
70.5 x 154.5 x 99
4230 (1919)
(1790 x 3924 x 2514)
90.5 x 128.5 x 99
3370 (1528)
(2299 x 3264 x 2515)
on page 24, for
Dry Weight, lb
(kg)
3300 (1497)
2300 (1043)
Vertiv | Liebert® CW™ Installer/User Guide
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