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C-3
Cisco Wide Area Application Engine 511 and 611 Hardware Installation Guide
OL-7220-02
Appendix C Maintaining the Cisco Wide Area Application Engine
Maintaining Your Site Environment
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 8 to 80 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 rated to operate at a maximum altitude of 6998 feet (2133 meters)
and can be stored at a maximum altitude of 15,000 feet (4570 meters).
Dust and Particles
A clean operating environment can greatly reduce the negative effects of dust and
other particles, which act as insulators and interfere with the operation of a
system’s mechanical components. In addition to regular cleaning, you should
follow these guidelines to deter contamination of the system equipment:
• Do not permit smoking anywhere near the system.
• Do not permit food or drink near the system.
• Use dust covers when the system is not in use.
• Close windows and outside doors to keep out airborne particles.