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5-2
Cisco AVS 3120 Application Velocity System Hardware Installation Guide
OL-11805-01
Chapter 5 Maintaining Your AVS 3120
Maintaining Your Site Environment
Temperature
Temperature extremes can cause a variety of problems, including premature aging and failure of chips
or mechanical failure of devices. Extreme temperature fluctuations can cause chips to become loose in
their sockets.
To minimize the negative effects of temperature on AVS 3120 performance, follow these guidelines:
• Ensure that the AVS 3120 operates in an environment no colder than 32°F (0°C) or hotter than 104°F
(40°C).
• Ensure that the AVS 3120 has adequate ventilation. Do not place it within a closed-in wall unit or
on top of cloth, which can act as insulation. Do not place it in direct sunlight. Do not place it next
to a heat source of any kind, including heating vents during winter.
Adequate ventilation is particularly important at high altitudes. AVS 3120 performance may not be
optimum when operating at high temperatures as well as high altitudes.
• Ensure that all slots and openings on the AVS 3120 remain unobstructed, especially the fan vent on
the back of the AVS 3120.
• Clean the AVS 3120 at regular intervals to avoid any buildup of dust and debris, which can cause it
to overheat.
• If the AVS 3120 has been exposed to abnormally cold temperatures, allow a 2-hour warm-up period
to bring it up to normal operating temperature before turning it on. Failure to do so may cause
damage to internal components.
Humidity
High-humidity conditions can cause moisture in the AVS 3120. This moisture can cause corrosion of
internal components and degradation of properties, such as electrical resistance, thermal conductivity,
physical strength, and size. Extreme moisture buildup inside the AVS 3120 can result in electrical shorts,
which can cause serious damage.
Each AVS 3120 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 the AVS 3120.
However, if an AVS 3120 is located in an unusually humid location, use a dehumidifier to maintain the
humidity within an acceptable range.
Altitude
Operating an AVS 3120 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.
The AVS 3120 is for use at a maximum altitude of 9843 feet (3000 meters).