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 Preparation and Guidelines
15
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