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

Page: 56 / 154

Figure 61. Installing the top hinge bracket
After this task is completed
Proceed to “Fill the heat exchanger with water” on page 62.
Water specifications for the secondary cooling loop
It is of crucial importance that water supplied to the heat exchanger meet the requirements listed in this
topic. Make sure to meet the requirements before setting up liquid cooling system.
Important: Without the water that is being supplied to the heat exchanger meeting the requirements that are
described in this topic, system failures might occur as a result of any of the following problems:
• Leaks due to corrosion and pitting of the metal components of the heat exchanger or the water-supply
system.
• Buildup of scale deposits inside the heat exchanger, which can cause the following problems:
– A reduction of the ability of the heat exchanger to cool the air that is exhausted from the rack
– Failure of mechanical hardware, such as a hose quick-connect coupling
• Organic contamination, such as bacteria, fungi, or algae. This contamination can cause the same
problems as described for scale deposits.
Control and conditioning of the secondary cooling loop
The water that is used to fill, refill, and supply the heat exchanger must be particle-free deionized water or
particle-free distilled water with appropriate controls for avoiding the following issues:
• Metal corrosion
• Bacterial fouling
• Scaling
52
ThinkSystem Heavy Duty Full Depth 42U Rack Cabinet User Guide