H3C Technologies H3C S9800 Series Switches - Manual (Page 11)

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The fan tray slot is foolproof. If you insert the fan tray with the
upside down, you cannot completely insert it into the slot. If this
happens, pull the fan tray out and then insert it again with the
upside up.
3. Use a Phillips screwdriver to fasten the captive screws on the fan
tray to secure the fan tray in the slot. See callout 2 in
Figure 3
and Figure 4 .
If the captive screws cannot be tightened, identify whether the fan
tray is installed correctly.
Figure 3 Installing one fan tray
IMPORTANT:
When one fan tray is required, install it in the lower fan tray slot. To
maintain good ventilation, the upper fan tray slot must have a filler
panel installed.
1
2