Specifications

44 | Fans
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Install a Fan Module
The fan modules in the S4820T are field replaceable. Module slot 0 is on the left side of the chassis;
module slot 1 is on the right side of the chassis.
To install a fan module, follow these steps:
Replace a Fan Module
To replace a fan module, follow these steps:
CAUTION: DO NOT mix airflow directions. Both fans must use the same airflow direction (reverse or normal). If the
airflows are mismatched, an error message appears and the system shuts down.
00:02:19:%S4820T:0%CHMGR-2-PSU_TYPE_AIRFLOW_MISMATCH: Mismatching PSU airflow
detected. Unit 0 shall get shutdown in next 60 seconds if mismatch not
rectified.
00:02:19:%STKUNIT0-M:CP%CHMGR-1-PSU_AIRFLOW_COMBO_MISMATCH: Major alarm:
Mismatching PSU airflow detected in unit 0
Step Task
1 Take the fan module out of the shipping box.
2 Use the grab handle to slide the fan module into the bay.
3 Tighten the securing screws on the sides of the fan module.
Step Task
1 Loosen the securing screws on the sides of the fan module.
CAUTION: You must complete steps 2 and 3 within one minute or the system powers down.
2 Use the grab handle to slide the fan module out of the bay.
3 Use the grab handle on the replacement module to slide it into the bay.
4 Tighten the captive screws on the replacement module with a screwdriver. Ensure the module is secure.