3.3 Operating Conditions
The Liebert® DSE500 must supply air to a conditioned space within the operating envelope that ASHRAE
recommends for data centers. Operating the DSE500 outside of this envelope can decrease equipment
reliability. Refer to ASHRAE’s publication, “Thermal Guidelines for Data Processing Environments.”
3.3.1 Cooling
The recommended maximum return-air temperature is 105°F (40°C) and maximum dew point is 59°F
(15°C). The recommended minimum return-air temperature setpoint Dry Bulb is 85°F (29°C).
The DSE500 has a more limited operating envelope than the recommended ASHRAE limits. The DSE500
operating limits are as follows:
• Return Air Temp: 105°F (41°C) Max, 90°F (32°C) Min
• Supply Air Temp: 85°F (29°C) Max, 70°F (21°C) Min for Perimeter Unit, 75°F (24°C) Min for
Rooftop Unit
• Outdoor Air: 102° (39°C) Max, –30°F (–37°C) Min
Model Weight, lb (kg)
DSE500 Perimeter 23,000 (10,433)
Operating outside this envelope can decrease equipment reliability.
NOTE: When running above 77°F (25°C) supply air temperature, the superheat readings on the
refrigeration circuits may be higher than 7.2°F(–14°C). The EEVs will run out of stroke and limit
mass flow, which will result in higher than normal superheat.
3.4
Unit Weights
Table 3.3 DSE500 unit weights
3 Pre-installation PreparationandGuidelines 15
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