The speed of the fans in the cooling modules is controlled by the SSB compute modules. For more
information about the system airflow, see “System airflow.”
Cooling modules can be hot-swapped while the enclosure is still running, assuming that only one module
is removed at a time and the swap takes no longer than 2 minutes. Ensure that you have a replacement
cooling module before you remove the defective cooling module.
The following figure shows a cooling module.
System airflow
The system must be operated with low-pressure rear exhaust installation. Back pressure that is created by
the rack doors and obstacles is not to exceed 5 pascals (0.5 mm water gauge). The cooling system
provides sufficient capacity to ensure that maximum temperatures are not exceeded.
The minimum open area for the rack doors is 70%.
Cooling module LEDs
Cooling modules have LEDs for the module status and fan faults.
The following figure shows the LEDs for a cooling module.
Figure 17. Cooling module
Chapter 2. System overview 17
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