Figure 6: Ethylene Glycol and Propylene Glycol Curves

Pe rce nt Glyc ol Cu rves for Free ze P rotec tion

40.0

30.0

20.0

10.0

0.0

-10.0

-20.0

-30.0

-40.0

-50.0

-60.0

0.0

10.0

20.0

30.0

% Gl ycol by Vol um e

Eth ylene G lycol

Prop ylene Glycol

40.0

50.0

60.0

Example: 45°F set point minus 20°F = 25°F.

From Figure 28, 25°F equates to 10% by volume of glycol required.

2-40 HP Portable Chillers

Chapter 3: Installation

26 of 78

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HP A0554832 manual Ethylene Glycol and Propylene Glycol Curves