Recommended range of operation
The recommended range of operation is the limit under which equipment operates the
most reliably while still achieving reasonably energy-efficient data center operation.
The recommended range of operation is 18°C–27°C (64.4°F to 80.6°F) at 5.5°C
(41.9°F) dew point to 60% relative humidity and 15°C (59°F) dew point.
Continuous allowable range of operation
Data center economization techniques such as free cooling can be employed to
improve overall data center efficiency. These techniques can cause equipment inlet
conditions to fall outside the recommended range, but still within the continuously
allowable range. Equipment can be operated without any hourly limitations in this
range.
The continuous allowable range of operation is 10°C–35°C (50°F–95°F) at 20% to
80% relative humidity with 21°C (69.8°F) maximum dew point (maximum wet bulb
temperature). De-rate the maximum allowable dry bulb temperature by 1°C per 300 m
above 950 m (1°F per 547 ft above 3117 ft).
Expanded allowable range of operation
During certain times of the day or year, equipment inlet conditions can fall outside the
continuously allowable range but still within the expanded improbable range.
Equipment operation is limited to ≤ 10% of annual operating hours in this range.
The expanded allowable range of operation is 5°C–10°C and 35°C–40°C (with no
direct sunlight on the equipment) at -12°C dew point and 8% to 85% relative humidity
with 24°C dew point (maximum wet bulb temperature). Outside the continuously
allowable range (10°C–35°C), the system can operate down to 5°C or up to 40°C for
a maximum of 10% of its annual operating hours. For temperatures 35 °C–40°C
(95°F–104°F), de-rate the maximum allowable dry bulb temperature by 1°C per 175 m
above 950 m (1°F per 319 ft above 3117 ft).
Exceptions to the expanded allowable range of operation
During certain times of the day or year, equipment inlet conditions can fall outside the
continuously allowable range but still within the expanded exceptional range.
Equipment operation is limited to ≤ 1% of annual operating hours in this range.
Exceptions to the expanded allowable range of operation are 5°C–10°C and 35°C–
40°C (with no direct sunlight on the equipment) at -12°C dew point and 8% to 85%
relative humidity with 24°C dew point (maximum wet bulb temperature). Outside the
continuously allowable range (10°C–35°C), the system can operate down to 5°C or
up to 45°C for a maximum of 1% of its annual operating hours. For temperatures
between 35°C and 45°C (95°F–104°F), de-rate the maximum allowable dry bulb
temperature by 1°C per 125 m above 950 m (1°F per 228 ft above 3117 ft).
DPE airflow
The DPE uses an adaptive cooling algorithm that increases or decreases fan speed as
the unit senses changes to the external ambient temperature. Exhaust increases with
ambient temperature and fan speed, and is roughly linear within recommended
operating parameters. Note that the information in the table below is typical, and was
measured without cabinet front/rear doors that would potentially reduce front-to-
back air flow.
Technical specifications
DPE airflow 23
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