4 Water Care
4 Water Care
W W W . B A L T I M O R E A I R C O I L . E U
19
WATER CARE
About Water Care
In the near freezing temperatures of the ICE CHILLER
®
Thermal Storage Unit, scale and corrosion are naturally
minimized. Therefore, for the tank water side of the units, a water treatment program to prevent scale or corrosion
is not normally needed, unless the water is corrosive in nature. To control biological growth, a biocide may be
needed on a periodic basis to prevent the growth of corrosive bacteria. In general, BAC recommends the following
guidelines. (See Table below).
Recommended Tank Water Quality
pH
7.0 to 9.0 *
Hardness (as CaCO
3
)
90 to 500 mg/l
Alkalinity (as CaCO
3
)
500 mg/l max.
Total Dissolved Solids
1000 mg/l max.
Chlorides
125 mg/l max.
Sulfates
125 mg/l max.
Conductivity
100-700 µS/cm
Water Quality Guidelines
* Tank water pH of 8.2 or higher will require periodic passivation of the galvanized steel coils to prevent "white rust", the accumulation of white,
waxy, non-protective zinc corrosion products on galvanized steel surfaces.
CAUTION
DO NOT TREAT THE TANK WATER WITH CHEMICALS THAT ALTER THE FREEZE POINT OF
WATER
Passivation
When new systems are first commissioned, special measures should be taken to ensure that galvanized steel
surfaces are properly passivated to provide maximum protection from corrosion.
Passivation
is the formation of a
protective, passive, oxide layer on galvanized steel surfaces.
TSU-M
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