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Maintenance Section
ppm = parts per million
Using water that meets the minimum acceptable
water requirement may not prevent drop-out of
these chemical compounds totally, but should min-
imize the rate to acceptable levels.
Antifreeze
Make proper antifreeze additions.
Adding pure antifreeze as a makeup solution for
cooling system top-up is an unacceptable practice.
It increases the concentration of antifreeze in the
cooling system which increases the concentration
of dissolved solids and undissolved chemical
inhibitors in the cooling system. Add antifreeze
mixed with water to the same freeze protection as
your cooling system.
Use the chart below to assist in determining the
concentration of antifreeze to use.
Minimum Acceptable Water
Water Content Limits gr/gal (ppm)
Chlorides 2.4 (40) maximum
Sulfates 5.9 (100) maximum
Total Hardness 10 (170) maximum
Total Solids 20 (340) maximum
pH 5.5 to 9.0
Antifreeze Concentrations
Protection Temperature Concentration
Protection to -15¡C (5¡F) 30% antifreeze and 70% water
Protection to -23¡C (-10¡F) 40% antifreeze and 60% water
Protection to -37¡C (-34¡F) 50% antifreeze and 50% water
Protection to -51¡C (-60¡F) 60% antifreeze and 40% water
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