IBM 1756, Installation And Maintenance Manual

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In the following illustration, the numbers represent the suggested placement of
racks that share one hole in the floor. For example, if three racks will share one
hole in the floor, place the racks as shown by the numbers 1, 2, and 3. If you want
to add a fourth rack that will share the same hole in the floor, place it next to rack
number 1.
To route and secure the hoses in a raised-floor environment, complete the following
steps:
1. Remove the floor tile under the rack that will have an access hole cut into it.
2. Cut an access hole in the floor tile; then, reinstall the floor tile. The access hole
for the supply and return hoses must be a minimum of 200 mm (8 in.) long x
100 mm (4 in.) wide.
Notes:
a. Each hose must be routed through the access hole lengthwise so that the
hose has the entire 200 mm (8 in.) to pass through the floor. If adjacent
racks share a hole in the floor, increase the size of the hole according to the
number of hoses, 50 mm (2 in.) in length for every rack. For example, the
hole for one rack is 100 x 200 mm (4 x 8 in.), the hole for two racks is 150 x
200 mm (6 x 8 in.), and so on. Smaller hole sizes might also work,
depending on the hose routing underneath the raised floor.
b. Each hose must be routed with a minimum bend radius of 200 mm (8 in.). A
bend radius less than 200 mm (8 in.) will cause the hose to kink, will restrict
the flow of water to and from the heat exchanger, and will void the heat
exchanger warranty.
2 3 5 1 4
Figure 34. Option for hoses in adjacent racks to share a single hole in the floor
Chapter 4. Installing the heat exchanger
45