IBM 7014 T00, Manual

Page: 172 / 196

Procedure
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.
Note:
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.
3. Route the hoses through the access hole lengthwise, under the rack and around the rear caster on the
pivot side of the heat exchanger.
Figure 115. Flexible hoses secured to the bottom of the rear door heat exchanger
After several hours of operation, repeat the air-purging procedure on the valve (trapped air from the
hoses might have migrated to the heat exchanger).
Check the heat exchanger for air in the manifolds again after one month of operation, to ensure that
the heat exchanger is filled correctly.
Raised-floor and non-raised-floor environments
You might need to install the manifold on a racks that are on both raised-floors and non-raised floors.
About this task
If the coolant distribution unit (CDU) that is providing water to the heat exchanger is in a row of racks with
heat exchangers, all hoses can be routed on the floor, irrespective of if it is a raised floor or slab
158 Power Systems: Racks and rack features