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Cisco Wide Area Virtualization Engine 274 and 474 Hardware Installation Guide
OL-17739-01
Appendix B Maintaining the Wide Area Virtualization Engine
Maintaining Your Site Environment
• Clean the system at regular intervals to avoid any buildup of dust and debris,
which can cause a system to overheat.
• If the system has been exposed to abnormally cold temperatures, allow a
2-hour warm-up period to bring it up to a normal operating temperature
before turning it on. Failure to do so may cause damage to internal
components, particularly the hard disk drive.
• If intermittent system failures are noticed, try reseating any socketed chips,
which might have become loose because of temperature fluctuations.
Humidity
High-humidity conditions can cause moisture migration and penetration into the
system. This moisture can cause corrosion of internal components and
degradation of properties such as electrical resistance and thermal conductivity.
Extreme moisture buildup inside the system can result in electrical shorts, which
can cause serious damage to the system.
Each system is rated to operate at 20 to 85 percent relative humidity, with a
humidity gradation of 10 percent per hour. Buildings in which climate is
controlled by air conditioning in the warmer months and by heat during the colder
months usually maintain an acceptable level of humidity for system equipment.
However, if a system is located in an unusually humid location, a dehumidifier can
be used to maintain the humidity within an acceptable range.
Altitude
Operating a system at high altitude (low pressure) reduces the efficiency of forced
and convection cooling and can result in electrical problems related to arcing and
corona effects. This condition can also cause sealed components with internal
pressure, such as electrolytic capacitors, to fail or perform at reduced efficiency.
Each system is designed to operate at a maximum altitude of 6500 feet (2000
meters) and can be stored at a maximum altitude of 30000 feet (9144 meters).