Liebert PX018 Installer's/User's Manual page 11

NOTICE
Risk of piping-system corrosion and freezing fluids. Can cause leaks resulting in equipment
and very expensive building damage. Cooling coils, heat exchangers 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, heat exchanger 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.
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 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.
NOTICE
Risk of no-flow condition. Can cause equipment damage. Do not leave the water/coolant fluid-
supply circuit in a 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.
Vertiv | Liebert® PDX™ and PCW™ Installer/User Guide | 11