Dell Unity™ All Flash and Unity Hybrid Unity 480/F, Unity 680/F, Unity 880/F Hardware Information Guide

Temperature gradient and altitude requirements

Systems and components must not experience changes in temperature and humidity that are likely to cause condensation to form on or in that system or component. Do not exceed the temperature gradient of 20°C/hr (36°F/hr), or the altitude requirement of 3050 m (10,0000 ft).

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).