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AP2500 Hardware Reference Guide 15
II. Components
Chassis Circulation System
The circulation system cools the hard disk drives by bringing fresh air in
from the side of the server and forcing the hot air out through the back. The
server’s air circulation system is comprised of two 3 inch (8 cm) fans mounted
in a removable module which brings cool air in from the outside to cool the
hard disk drives. Another set of two 2 1/4 inch (6 cm) cooling fans mounted
on the chassis, forces the warm air out of the chassis. The two fans in each
module provides redundancy in order to increase air flow as well as insure
continued circulation if one fan should fail. This circulation system should
ensure that the air surrounding the hard disk drives are kept below 122˚F
(50˚C) to prevent hard disk failures.
Rear Cooling Fans
The system fan modules on the rear is held by two screws and four latches
on the interior of the chassis. There are four screws used to secure the fan
into the individual frames. The fan module’s operating status can be viewed
through the ASUS ASMA software. If an individual fan fails, remove the
fan and send it back to the vendor for replacement. If both fans fail, it may
be that the fan control board needs replacing. If the fans do not work after
replacing both of them, remove the control board and send it back to your
vendor for replacement.
II. System Components
Individual fan with frame
Screw Locations
Usually, the rotation of the fan sends air toward the
manufacturer’s label on the center of the fan.
Four Latches
Two Screws
Rear fan modules
Top Fan
Bottom Fan
Air flows out
through the
back