Enertech EAV060 - Page 59

Enertech Global 
EAV - EME/EMD Rev. A Models
Installaon and Operaons Manual
Extreme Annual Temperature, deg F Period Values of Extreme Temperature, deg F
Mean
Standard
Deviaon
5 years 10 years 20 years 50 years
Min Max Min Max Min Max Min Max Min Max Min Max
-3.2 90.5 7.5 3.9 -8.6 93.2 -13.1 95.5 -17.3 97.7 -22.8 100.5



 shows the Extreme Annual Temperature for Chicago at
-17.3 deg F. For adequate burst protecon, a concentraon of
30% Alphi-11 should be used to protect the system.
In most areas of North America, 25% to 30% is sucient for
burst protecon. In Northern U.S. and some Canadian climates,
35% or more must be used. Enertech recommends 25% or higher
concentraon, depending upon locaon. Lower concentraon
provides beer heat transfer and lower viscosity, but may not
provide enough burst protecon.