3.2 Connections and System Setup
•
The unit requires a drain, which must comply with all applicable codes. See
above, for details.
•
If seismic requirements apply, consult your Vertiv representative for information about a seismic rated floor
stand.
NOTE: Seal openings around electrical connection to prevent air leakage. Failure to do so could reduce the unit’s
cooling performance.
The Liebert® DSE controls superheat with an electronic expansion valve (EEV). The EEV controller adjusts the orifice based
on suction pressure and temperature. The EEV control will drive the valve to maintain the superheat setpoint, set in the
Liebert® iCOM™, using a Proportional, Integral, Derivative (PID) routine. The PID control values are set at the factory for
most applications. These default values PID will allow stable superheat control of the unit.
3.3 Operating Conditions
The Liebert® DSE must be operated in a conditioned space within the operating envelope that ASHRAE recommends for
data centers. Operating the DSE 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 DSE is 85°F (29.4°C).
3.3.1 Humidification Control
The humidifier option is not available on the DA250 or DA265. A remote humidifier contact is available for a standalone
humidifier.
3.4 Shipping Dimensions and Unit Weights
Model #
Domestic Packaging
Export Packaging
Dry Weight, lb (kg)
Ship Weight, lb (kg)
Shipping Dimensions, in. (mm)
Ship Weight, lb (kg)
Shipping Dimensions, in. (mm)
DA250, DA265
6,160
(2,794)
90 x 128 x 97
(2,286 x 3,251 x 2,464)
6,540 (2,966)
90.5 x 1,28.5 x 99
(2,299 x 3,264 x 2,515)
4,761
(2,159)
Fan section
3,281
(1,488)
90 x 128 x 54
(2,286 x 3,251 x 1,372)
3,676 (1,667)
90.5 x 1,28.5 x 99
(2,299 x 3,264 x 2,515)
2325
(1,055)
Table 3.2 Downflow Unit Domestic and Export Shipping Dimensions and Weights
Vertiv | Liebert® DSE Thermal Management System Installer/User Guide
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