Ambient Temperature Recommendations - Sun Microsystems Sun Fire E6900 Site Planning Manual

The environmental limits for Sun Fire E6900/E4900 systems are listed in
Environmental Limits for Sun Fire E6900/E4900 Systems
TABLE 3-1
Environmental
Factor Temperature Range
Operating 41°F to 95°F (5°C to 35°C)
derate 2°C for every 1 km
up to 3 km
Nonoperating -4°F to 140°F (-20°C to 60°C)
TABLE 3-2
Environmental
Factor
Operating
The operating environmental limits in Table 3-1 reflect what the systems have been
tested to, in order to meet all functional requirements. The optimum operating
condition in Table 3-2 is the recommended operating environment. Operating
computer equipment for extended periods of time at or near the temperature or
humidity extremes is known to significantly increase the failure rate of hardware
components.
Note – In order to minimize any chance of down-time due to component failure, it
is strongly recommended that customers plan and use the optimal temperature and
humidity ranges.
3.1.1

Ambient Temperature Recommendations

The ambient temperature range of 70°F to 74°F (21°C to 23°C) is optimal for system
reliability and operator comfort levels. Most computer equipment can operate within
a wide temperature range, but a level near 72°F (22°C) is desirable because it is
easier to maintain safe associated relative humidity levels at this temperature.
Operating in this temperature range provides a safety buffer in case the
environmental support systems go down for a period of time. Though individual
standards vary slightly, 70°F to 74°F (21°C to 23°C) should be used as an optimal
recommendation.
3-2 Sun Fire E6900/E4900 Systems Site Planning Guide • May 2006
Relative Humidity
20% to 80%, 27°C max wet
bulb (noncondensing)
93%, 38°C max wet bulb
(noncondensing)
Optimum Ambient Environmental Operating Conditions for Sun Fire
E6900/E4900 Systems
Ambient Temperature Range
70°F to 73.5°F (21°C to 23°C)
Table
Altitude
sea level to 9,843 ft (3000m)
(Up to 7,000 ft (2134m) for
®
UltraSPARC IV+ 1.8 GHz
CPU/Memory boards)
39,370 ft (12,000m)
Ambient Relative Humidity
45% to 50%,
3-1.