Technical information

UGH021/0301 VL Series Portable Chillers, 2 to 40 Tons
Page: 69
C. USE OF PLAIN GLYCOL:
1. Even through they do lower the freeze point, plain glycols
are even more corrosive than water. The corrosion rate of
plain ethylene glycol on iron, for example, is more than 2.5
times faster than plain water. On steel, it is 4.5 times faster.
D. AUTOMOTIVE BASED ANTIFREEZE:
1. SHOULD NEVER BE USED!
Automotive antifreeze contains
silicate based inhibitors, which are compatible with
automotive components. In an industrial application, the
silicates will leach out and form a gel-like substance on the
heat transfer surfaces and reduce cooling efficiency of the
system. These silicates have shown to significantly reduce
the lifetime of pump seals.
E. MAINTENANCE RESPONSIBILITY:
1. A hygrometer should be used on a regular basis to
determine the mixture strength according to freeze point.
The freeze point temperature should be 25°F below the
lowest required setpoint (see chart on page 59). Water will
evaporate from the mixture, and if you continue to add a
premixed solution, eventually you will have too much
glycol. It is necessary to add water or glycol to maintain
proper freeze point temperature. The device pictured is by
far the most accurate and easy to use for maintaining and
checking for proper glycol levels.reduction in cooling
capacity and is virtually impossible to remove.