Fan Module Installation; Preinstallation Inspection; Installation - Paradyne COMSPHERE 3000 Series Installation Manual

Fan Module Installation

For installations where the ambient temperature is
likely to be near the upper limit of the acceptable range
(see Table 3-1), a fan module must be added to the carrier
to provide forced air cooling.

Preinstallation Inspection

Check the unit for physical damage, such as broken
blades. Spin fan blades manually to test for damage. If the
fan module shows signs of damage, report this
immediately to your shipping representative and also to
your AT&T Paradyne representative. Otherwise, install
the fan module.
Ambient
C cu Ca d Circuit Card
Temperature Temperature
Configuration
Range
DSUs without
DBMs and Model
3151 CSUs
_ _
DSUs with DBM,
39 – 86 F F
_ _
and Model 3811
(4 – 30 C)
and 3911 dial/
lease modems
Model 3161 DSU/
2
CSUs
_ _
86 _ – 122 _ F Model 3161 DSU/
2
(30 – 50 C) CSUs
1
Installing the TDM or MCMP option has no effect on this table.
2
Use the strictest cooling requirements when there is a mixture of units installed.
3
Allow 1.75 (IU) spacing between carriers if more than 3 carriers are required.
3000-A2-GA31-80

Installation

transformer unit; therefore, this procedure assumes the
power transformer unit has been installed.
Table 3-1
Fan Module Cooling Requirements
1 1
1 – 2
No Fan Modules
No fan modules 1 fan module
(place in middle
carrier)
2
1 fan module per carrier or 1 fan module
per two carriers (placed in upper carrier)
(Limit of 3 carriers in a cabinet at temperatures above 40
December 1994
The optional fan module is connected to the power
.
To install the fan module:
Procedure
1. If the fan module is being installed after the carrier
has been installed, loosen the four captive screws
(see Figure 3-10) that attach the cover plate to the
carrier and remove the cover plate. If an SDCP is
not being installed, set the cover plate aside for
reinstallation after the fan module has been
installed.
Number of Carriers
3 4
2 fan modules
(place in bottom
carrier and
second from top)
1 fan module per carrier
Installation
5 – 6
1 fan module
(place in second
carrier from top)
1 fan module
per carrier per carrier
_ _
3
C or 104 F)
3-15