Install Guide

Fans

The S4048T-ON comes from the factory with two PSUs and four fan modules installed in the chassis. The fan modules and the power

supplies, which have integrated fans, are hot-swappable.

NOTE: To run the system, the four fan slots must have operating fan units. If you do not install a module in each slot, the system

shuts down in one minute.

In addition to the power supply modules, you can order and install fan modules separately.

The system supports two airow direction options. DO NOT mix airow types in a chassis; you can use only a single airow direction in a

chassis. If you mismatch the airow directions, the system powers down in one minute.

• Normal—airow is from the I/O panel to the PSU.

• Reversed—airow is from the PSU to the I/O panel.

All fans and PSUs in a conguration must be in the same airow direction.

Environmental factors can decrease the amount of time required between fan replacements. Check the environmental factors regularly. An

increase in temperature and/or particulate matter in the air might aect performance; for example, new equipment installation.

CAUTION

: Check the fans at six-month intervals and replace them as necessary. Regularly monitor the speeds of the cooling

fans to accurately determine replacement intervals.

Topics:

• Components

• Fan module installation

• Fan module replacement

• Fan air lter replacement

Components

The following list the fan components:

• S4048T-ON fan module

• S4048T-ON fan module—reverse ow

Fans 33