Sun Microsystems Sun Fire 12K, Site Planning Manual

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2-1
C H A P T E R
2
Environmental Requirements
2.1 Environmental Requirements
The design of the environmental control system (such as computer room air
conditioning units) must ensure that intake air to the system meets the requirements
specified in this section. Air enters the cabinet through the access panels and
through an air intake that is located underneath the system cabinet. The heated air is
exhausted out of the top of the system cabinet. Overheating can occur if warm air is
directed underneath a cabinet or toward the access panels.
TABLE 2-1
provides the
environmental requirements for the Sun Fire 15K/12K systems and the customer
selected I/O expansion racks. If the system is significantly colder
(
40
°
F [4
°
C] or
colder
)
than the environment in which you will install it, leave the system in its
shipping crate at its final destination for 24 hours to prevent thermal shock and
condensation.
TABLE 2-1
Environmental Requirements
Environmental
Factor
Operating Nonoperating
Suggested
Operating Range
Temperature 50–95
°
F (10
–
35
°
C) derated 2
°
for every 1 km up to 3 km.
Temperature ramp rate not to
exceed 59
°
F (15
°
C) per hour,
humidity ramp rate not to
exceed 30% relative humidity
per hour.
-4–140
°
F (-20
°
C–60
°
C)
Temperature ramp rate not to
exceed 68
°
F (20
°
C per hour),
humidity ramp rate not to
exceed 20% relative humidity
per hour.
70-74
°
F
(21–23
°
C)
Humidity 20%–80% (noncondensing)
81
°
F (27
°
C) max wet bulb
Up to 93% 45%–50%
Altitude Up to 10,000 ft (3,047 m) Up to 40,000 ft (12,188 m)