Dell S4112F S4112-ON Series Setup Guide - Page 9

Fans and airflow Fan installation is done as part of the factory install based on stock keeping unit (SKU) type. The S4112-ON Series switch has SKUs that support the following configurations: • AC PSU with PSU fan and system fans normal airflow • AC PSU with PSU fan and system fans reverse airflow • DC PSU with PSU fan and system fans normal airflow • DC PSU with PSU fan and system fans reverse airflow For proper ventilation, position the switch in an equipment rack or cabinet with a minimum of 5 inches (12.7 cm) of clearance around the exhaust vents. The fan speed varies based on internal temperature monitoring. The switch never intentionally turns off the fans. Power To connect the switch to the applicable power source, use the appropriate power cable. An AC power cable is included with the switch. When installing AC or DC switches, follow the requirements of the National Electrical Code ANSI/NFPA 70, where applicable. The switch is powered-up when the power cable is connected between the switch and the power source. CAUTION: Always disconnect the power cable before you service the power supply slots. The switch has multiple power cords. Before servicing, ensure all power cords are disconnected. CAUTION: On the AC switch, use the power supply cable as the main disconnect device. Ensure that the socket-outlet is located/installed near the equipment and is easily accessible. NOTE: Module power is software controlled. You do not see module LEDs when the switch powers up in ONIE. Site preparations 9