IBM 0551, Manual

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3. Locate the rack-mounting hardware kit (A) , and the rack rails (B) that were included with your
system unit as shown in Figure 19 on page 26.
The system rails
(B) are front-to-back and left-to-right side dependent. The rails are labeled left and
right to indicate their placement when you face the front of the rack. The back of each rail has two
large latch assemblies. These latch assemblies go in the back of the rack.
4. Determine where you will locate the system unit in the rack. See “Determining the location.”
5. Next, you must attach mounting hardware to the rack. For more information, see Attach the mounting
hardware to the rack.
Determining the location
You might need to determine where to install the system in the rack. Use this procedure to perform this
task.
Before installing the system unit into a rack, complete the following steps:
1.
Read the “Rack safety notices” on page 106.
2. Plan where to place the units. Place the larger and heavier units in the lower part of the rack.
This system unit is four Electronic Industries Alliance (EIA) units high. An EIA unit is 44.45 mm (1.75
in.) in height. The rack contains three mounting holes for each EIA unit of height. This system unit
therefore is 177.8 mm (7 in.) high and covers 12 mounting holes in the rack.
3. If necessary, remove the filler panels to allow access to the inside of the rack enclosure where you
plan to place the unit.
Chapter 3. Installing a system or expansion unit into a rack
27