Vertiv Liebert CW, Installer/User Manual, Page: 29 / 76

5.1.2 Condensate-pump Drain Line Requirements
NOTICE
Risk of water backing up in the drain line. Leaking and overflowing water can cause equipment
and building damage.
Sagging condensate drain lines may inadvertently create an external trap.
Observe the following requirements when installing and routing the drain line:
• The drain line must be located so it will not be exposed to freezing temperatures.
• Size the piping based on the available condensate head.
• The drain line must be rigid enough that it does not sag between supports, which
unintentionally creates traps.
• We recommend installing monitored, under-floor leak-detection equipment.
5.2 Chilled-water Loop Piping Guidelines
WARNING! Risk of improper piping installation, leak checking, fluid chemistry and fluid
maintenance can cause equipment damage and personal injury. Installation and service of this
equipment should be done only by qualified personnel who have been specially-trained in the
installation of air-conditioning 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. Cooling coils and piping systems are at high risk of
freezing and premature corrosion. Fluids in these systems must contain the proper antifreeze
and inhibitors to prevent freezing and premature coil and piping 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/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.
5 Piping Requirements
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