Commercial grade coolant fluid is generally less corrosive to the common metals of construction than water
itself. It will, however, assume the corrosivity of the coolant fluid from which it is prepared and may become
increasingly corrosive with use if not properly inhibited.
Vertiv recommends installing a monitored fluid-detection system that is wired to activate the automatic closure
of field installed coolant fluid supply and return shut off valves to reduce the amount of coolant fluid leakage and
consequential equipment and building damage. The shut off valves must be sized to close off against the
maximum coolant fluid system pressure in case of a catastrophic fluid leak.
• Primary circuit: The CoolChip CDU 600 is designed for use with a facility supply of water or up to 20%
glycol/water. A 20% glycol concentration will give protection to approximately -9°C (16°F). If a higher
concentration of glycol is used, then the cooling capacity of the unit may have to be de-rated. Contact Vertiv for
advice.
• Secondary circuit:The secondary circuit should be filled either be PG-25 heat transfer fluid or particulate free
deionized water treated with suitable corrosion inhibitors and biocides for the cooling application.
Failure to use adequate fluid treatment may result in decreased system performance and reliability due to
corrosion, scaling, fouling and microbiological growth which may invalidate the warranty.
6.2 Planned Preventative Maintenance
Planned maintenance services should be carried out every 6 months following installation and commissioning. Refer to the
Installation and Commissioning manual for further information on fluid specifications.
6.2.1 Special Tools and Equipment
• Surface temperature measurement device
• Air temperature measurement device
• Clamp-on ammeter
• Drain tube (supplied with unit)
• Fluid sample kit (for fluid analysis)
• Micro-SD card reader and computer
6.2.2 Visual Checks for Damage and Leakage
• Pipework and hoses
• All temperature, level, flow, and pressure sensors
• Expansion vessels and Schrader valves
• Auto air vents and screw caps
• Drain valves
• Pumped clamped connections
• Pipe clamped connections
• Heat exchange pipework and connections
• Check running pump for abnormal noise
• Record any damage to unit
68 Proprietary and Confidential ©2025 Vertiv Group Corp. 6 Maintenance
Vertiv™ CoolChip CDU 600 Operation and Maintenance Guide
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