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COOLPHASE CDU & LIEBERT® XDM
BRAZED PLATE HEAT EXCHANGER
REV : C
REV : 08/2024
DPN001040_REV6
Table 2: Ethylene Glycol Values
GLYCOL AND WATER REQUIREMENTS
There are two (2) basic types of additives:
• Corrosion Inhibitors
• Environmental Stabilizers
The Corrosion Inhibitors function by forming a surface barrier that protects metals from attack. Environmental Stabilizers, while not Corrosion
Inhibitors in the strictest sense, decrease corrosion by stabilizing or favorably altering the overall environment. An alkaline buffer, such as
borax, is a simple example of an environmental stabilizer because its prime purpose is to maintain an alkaline condition (pH above 7).
NOTICE:
Water chemistry varies greatly by location, as do the required additives that reduce the corrosion effect of the fluids on the piping system
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. 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. The water or
water/glycol solution must be analyzed 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.
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.
Remove any dirt, oil, or metal filings that may contaminate the cooling system piping to prevent contamination of the fresh glycol solution and
fouling of the system. Flush the system thoroughly using a mild cleaning solution or high-quality water and then completely drain before
charging with glycol.
Cleaning a new system is just as important as cleaning an old one. New systems can be coated with oil or a protective film. Dirt and scale are
also common. Any residual contaminants could adversely affect the heat-transfer stability and performance of your system. In most cases,
special cleaners are needed to remove scale, rust, and hydrocarbon foulants form pipes, manifolds, and passages.
For more information on cleaners and degreasers, contact your Vertiv representative. Follow the manufacturer’s instructions when using these
Recommended % PG by Volume Recommended % PG by Mass
Down to 15 (-9) 20 22
Down to 5 (-15) 25 27
Down to -10 (-23) 30 33
Down to -30 (-34) 35 38
Winter Outside Design Temperature °F (°C)
Secondary Side
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