• The secondary fluid circuit must be filled per the guidelines in Secondary Fluid Circuit
Requirements on page61 .
• The secondary fluid circuit must be charged with the approved fluid and the secondary
circuit fluid temperature must be within +/- 5°F and 9°C of the operating point.
8. If the operating point changes, the secondary fluid coolant volume may need to be adjusted according to the
new operating point.
9. The return secondary fluid temperature to the CoolPhase CDU must be stable before loading IT equipment into
fluid circuit.
a. If the secondary fluid temperature is not stable that may be due to a lack of heat load in the circuit which
will require additional load banks .
2.3 Cooling Configuration
Best practice is to place equipment racks in alternating rows of cold aisles and hot aisles. This is best accomplished when the
layout of the computational infrastructure is being planned. It is more difficult to accomplish when the computer room is
already populated with operating hardware.
Figure System Loop Style Redundant Teamwork
Dual System, Separate Coolant Loops
Interlaced (See Figure 2.5 on the next page .)
Dual Dual Interlaced Yes (Some) No
Single System (See Figure 2.4 below ). Single Single Simple No No
Dual System, Single Common Loop Reversed
Return (See Figure 2.6 on page17 .)
Dual Single Reverse return Yes Yes
Figures illustrate some piping alternatives suitable for small installations. Larger multi-module layouts are possible with a wide variety of piping
configurations to support redundancy, maintainability, and other considerations.
Table 2.5 Legend, Dual System, Single Common Loop Reversed Return
Figure 2.4 Single Loop
2 Nomenclature and Components Proprietary and Confidential ©2024 Vertiv Group Corp. 15
Vertiv™ CoolPhase CDU Installer/User Guide
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