Water chemistry varies greatly by location, as do the required additives, called inhibitors, that reduce the
corrosive effect of the fluids on the piping systems and components. The chemistry of the water used must be
considered, because water from some sources may contain corrosive elements that reduce the effectiveness of
the inhibited formulation. Sediment deposits prevent the formation of a protective oxide layer on the inside of the
coolant system components and piping. The water/coolant fluid must be treated and circulating through the
system continuously to prevent the buildup of sediment deposits and/or growth of sulfate reducing bacteria.
Proper inhibitor maintenance must be performed in order to prevent corrosion of the system. Consult glycol
manufacturer for testing and maintenance of inhibitors.
Commercial ethylene glycol, when pure, is generally less corrosive to the common metals of construction than
water itself. It will, however, assume the corrosivity of the water from which it is prepared and may become
increasingly corrosive with use if not properly inhibited.
We recommend 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.
NOTICE
Risk of no flow condition. Can cause equipment damage.
Do not leave the water/coolant fluid supply circuit in a continuous no flow condition. Idle fluid allows the
collection of sediment that prevents the formation of a protective oxide layer on the inside of tubes. Keep unit
switched On and water/coolant fluid supply circuit system operating continuously. In multiple unit teams, allow
standby units to enter the rotation automatically or schedule regular manual rotations.
NOTICE
Risk of leaking chilled water lines. Can cause equipment and building damage.
Lines and joints must be inspected regularly. Improper installation, application and service practices can result in
water leakage from the unit. Water leakage can result in severe property damage and loss of critical data center
equipment. Do not locate unit directly above any equipment that could sustain water damage.
Vertiv recommends installing monitored leak detection equipment for the unit and supply and return lines.
NOTICE
Risk of a catastrophic water circuit rupture. Can cause expensive building and equipment damage.
Install an overflow drain pan under the unit with a monitored leak detection system in the pan and shutoff valves
in the supply and return water lines that automatically close if water is detected by the leak detection system.
The shutoff valves should be spring return and must be rated for a close-off pressure that is the same as or
higher than the supply water pressure. If it is not possible to install an overflow drain pan, then a monitored leak
detection system should be installed in the base of the unit or under the unit to actuate the shutoff valves
immediately on a leak detection signal.
• Equipment damage and personal injury can result from improper installation, leak checking, fluid chemistry, and
fluid maintenance.
Follow local piping codes and safety codes.
• During brazing, fill lines with flowing nitrogen to prevent excessive oxidation and scale formation inside the
piping. Inside of secondary piping must be protected from excessive oxidation and scale formation (whether
welded or brazed.)
62 Proprietary and Confidential ©2024 Vertiv Group Corp.
7 Secondary Fluid Circuit
Requirements
Vertiv™ CoolPhase CDU Installer/User Guide
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