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Fans
The S55 comes from the factory with 1 power supply and 2 fan modules installed in the chassis. Both the
fan module and the integrated fan-power supply are hot-swappable if a second (redundant) power supply
is installed and running. With redundant power supplies, traffic will not be interrupted if a fan module is
removed.
NOTE: Both slots must have operating fan units to run the system. If a module is not installed in each slot the
system will shut down in 1 minute.
In addition to the integrated fan/power supply modules, fan modules can be ordered separately and
additional modules can be inserted in the chassis.
The S55 supports two airflow direction options. Only a single direction can be used in a chassis; do not
mix fan flow types in a chassis. The system will shutdown in 1 minute, if the airflow directions are
mismatched.
• Normal is airflow from I/O panel to power supply
• Reversed is airflow from power supply to I/O panel
There are environmental factors that could decrease the amount of time required between fan
replacements. Check these environmental factors regularly. Any unusual environmental circumstance at
the site that causes an increase in temperature and/or particulate matter in the air might affect
performance (for example, new equipment installation).
CAUTION: Fans should be checked at six-month intervals and replaced as necessary. Regularly monitor the
speeds of the cooling fans in order to accurately determine replacement intervals.
CAUTION: For NEBS compliance, use the NEBS approved filters. These filters are colored green, and are
installed exactly the same as the non-NEBS filters.
Components
CAUTION: Fans should be checked at six-month intervals and replaced as necessary. Regularly monitor the
speeds of the cooling fans in order to accurately determine replacement intervals.
• S55 Fan module (Catalog# S55-FAN)
• S55 Fan module - Reverse flow (Catalog# S55-FAN-R)
Install a fan module
The fan modules in the S55 are field replaceable. The power supply units are in a single piece with fans,
but individual fans are available. Refer to
entire power supply.
Module Slot 0 is on the left; Module Slot 1 is on the right.
Chapter 5, Power Supplies
for the procedure to replace the
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Fans
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