Environmental specifications
Table 20. Continuous Operation Specifications for ASHRAE A2
Temperature Specifications
Allowable continuous operations
Temperature range for
altitudes <= 900 m (<=
2953 ft)
10–35°C (50–95°F) with no direct sunlight on the equipment
Humidity percent range
(non-condensing at all
times)
8% RH with -12°C minimum dew point to 80% RH with 21°C (69.8°F) maximum dew point
Operational altitude de-
rating
Maximum temperature is reduced by 1°C/300 m (1.8°F/984 Ft) above 900 m (2953 Ft)
Table 21. Continuous Operation Specifications for ASHRAE A3
Temperature Specifications
Allowable continuous operations
Temperature range for
altitudes <= 900 m (<=
2953 ft)
5–40°C (41–104°F) with no direct sunlight on the equipment
Excursion Limited Operation 5-35°C (41-95°F) Continuous Operation
35-40°C (95-104°F) 10% Annual Runtime
Humidity percent range
(non-condensing at all
times)
8% RH with -12°C minimum dew point to 85% RH with 24°C (75.2°F) maximum dew point
Operational altitude de-
rating
Maximum temperature is reduced by 1°C/175 m (1.8°F/574 Ft) above 900 m (2953 Ft)
Table 22. Continuous Operation Specifications for ASHRAE A4
Temperature Specifications
Allowable continuous operations
Temperature range for
altitudes <= 900 m (<=
2953 ft)
5–45°C (41–113°F) with no direct sunlight on the equipment
Excursion Limited Operation 5-35°C (41-95°F) Continuous Operation
35-40°C (95-104°F) 10% Annual Runtime
40-45°C (104-113°F) 1% Annual Runtime
Humidity percent range
(non-condensing at all
times)
8% RH with -12°C minimum dew point to 90% RH with 24°C (75.2°F) maximum dew point
Operational altitude de-
rating
Maximum temperature is reduced by 1°C/125 m (1.8°F/410 Ft) above 900 m (2953 Ft)
Table 23. Common Environmental Specifications for ASHRAE A2, A3 and A4
Temperature Specifications
Allowable continuous operations
Maximum temperature gradient (applies to both
operation and non-operation)
20°C in an hour* (36°F in an hour) and 5°C in 15 minutes (9°F in 15
minutes), 5°C in an hour* (9°F in an hour) for tape hardware
NOTE: * - Per ASHRAE thermal guidelines for tape hardware, these are
not instantaneous rates of temperature change.
32 Technical specifications
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