Lenovo ThinkSystem Heavy Duty Full Depth 42U Rack Cabinet, User Manual

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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.
• 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.
Step 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. See “Filling the heat exchanger with water” on page 48 for
information about how to connect the hoses.
Step 4. 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
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 installation.
The Type 9363 rack has sufficient clearance underneath the rack to enable the quick connects to be run
underneath the rack. This provides a very clean hose-routing solution with hoses of minimum length.
Note: 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.
Step 1. If the hoses must be run overhead, either route the hoses through the rack vertically, or route them
vertically down the hinge (pivot) side of the heat exchanger, leaving enough slack in the hoses to
reach the couplings.
Figure 90. Routing and securing the hoses in raised-floor and non-raised-floor environments (from the top,
looking down)
Step 2. 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). To perform the air-purging procedure, complete
step 7 on page 52 through step 10 on page 52 in Filling the heat exchanger with water.
Step 3. Check the heat exchanger for air in the manifolds again after one month of operation, to ensure that
the heat exchanger is filled correctly.
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ThinkSystem Heavy Duty Full Depth 42U Rack Cabinet User Guide