7 Secondary Fluid Circuit Requirements
7.1 Interconnection with Cooling Modules
ASTM type ACR copper piping or stainless piping must be used in the secondary fluid circuit. The Vertiv™ CoolPhase CDU
may be connected to Vertiv™ Liebert® DCD cooling modules or IT server equipment with prefabricated piping assembly or
rigid, off-the-shelf piping. The cooling modules or IT server equipment are connected in parallel between main return and
supply pipes going to and from the CoolPhase CDU.
7.2 Fluid Requirements
See 10025700 included in Submittal Drawings on page107 to determine if water or a water/glycol mixture is best suited for
your application.
7.3 Secondary Fluid Loop Piping Guidelines
CAUTION: Risk of improper piping installation, leak checking, fluid chemistry and fluid maintenance. Can
cause injury. Building and equipment damage may also result. Installation and service of this equipment
should be done only by qualified personnel who have specialized training for liquid cooling equipment and
who are wearing appropriate, OSHA-approved PPE.
NOTICE
Risk of frozen pipes and corrosion from improper coolant mixture. Can cause water leaks resulting in equipment
and building damage.
When the cooling unit or piping may be exposed to freezing temperatures, charge the system with the proper
percentage of glycol and water for the coldest design ambient temperature. Automotive antifreeze is
unacceptable and must NOT be used in any glycol fluid system. Use only HVAC glycol solution that meets the
requirements of recommended industry practices. Do not use galvanized pipe.
NOTICE
Risk of piping system corrosion and freezing fluids. Can cause leaks resulting in equipment and very expensive
building damage. Piping systems are at risk of freezing and premature corrosion. Fluids in these systems must
contain the proper antifreeze and inhibitors to prevent freezing and premature corrosion. The water or
water/glycol solution must be analyzed by a competent local water treatment specialist before start-up to
establish the inhibitor and antifreeze solution requirement and at regularly scheduled intervals throughout the
life of the system to determine the pattern of inhibitor depletion.
The complexity of water and water/glycol solution condition problems and the variations of required treatment
programs make it extremely important to obtain the advice of a competent and experienced water treatment
specialist and follow a regularly scheduled coolant fluid system maintenance program.
7 Secondary Fluid Circuit
Requirements
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Vertiv™ CoolPhase CDU Installer/User Guide
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