Installation
80
Aastra 470 as of R1.2
syd-0337/1.2 – R1.2 – 11.2011
3. If necessary install the redundant fan unit (see
4. Connect the earthing (see
"Connecting the earthing wire", page 82
).
5. Secure the communications server to the rack’s fastening rails using the M6
screws and the cage nuts.
6. Fit the screw covers on the left and right of the front panel.
7. Connect the earthing (see
"Connecting the earthing wire", page 82
).
8. Always observe the location requirements set out in
4. 2. 6. 2
Fitting an additional fan
An additional fan can be fitted in front of the standard fan already integrated. Both
fans always rotate at the same time and at the same speed, depending on the tem-
perature inside the communications server. The redundant fan unit increases the
system’s operating reliability. If one fan fails, the second fan dissipates the heat. A
fan failure generates an event message, allowing the defective fan (or both fans) to
be replaced.
Note
Fans have a limited service life. So if a fan fails become of age (> approx. 5
years) it is advisable to replace both fans as a precautionary measure.
Materials required:
• Aastra 470 additional fan premounted on fastening frame
• Set of screws for additional fan
• Screwdriver
To install the additional fan proceed as follows:
1. Disconnect the communication server from the power supply.
Warning
Be sure to observe the
.
2. Remove the upper rear housing cover.
3. Remove the 4 rubber covers from the holes in the back panel of the communica-
tions server provided for mounting the additional fan.
4. Use the 4 enclosed screws to fit the fastening frame complete with additional