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Operating Procedures
Table 12. Freeze and burst protection chart
Water/Glycol
Freeze Protection
Temperature
20°F (-7°C)
18% glycol mixture
10°F (-12°C)
29% glycol mixture
0°F (-17.8°C)
36% glycol mixture
-10°F (-23°C)
42% glycol mixture
-20°F (-29°C)
46% glycol mixture
The precise concentration of glycol for a particular chiller is
affected by several key factors such as ambient
temperature extremes, entering and leaving water
temperatures, and chiller size. A chiller's optimum glycol
concentration is modified by these considerations as
reflected in
Table 11, p.
46. These capacity correction
factors are the "best informed estimates" for chiller with
copper evaporators. The percentages may vary depending
on the materials and alloys of the heat exchangers, total
surface area, the amount of present or future fouling, and
the brand of glycol used.
Storage Provisions
The chiller controls are designed for storage in ambient
temperatures from -20°F (-29°C) to 145°F (63°C) with
relative humidity from 0% to 100%. The glycol should be
removed from the chiller if the unit is to be stored for
extended periods. Although fluids can be drained via the
48
Burst Protection
12% glycol mixture
20% glycol mixture
24% glycol mixture
28% glycol mixture
30% glycol mixture
plug in the bottom of the evaporator, the inhibitors in an
approved glycol solution will best protect the surfaces of
the evaporator against oxidation if the glycol remains inside
the chiller during storage.
Figure 23. Water/Glycol concentration freezing points
(in degrees fahrenheit)
ARTC-SVX008A-EN
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