179
Installation
8.4.9.5
WATER CONTROL
It is necessary to analyse the quality of water by checking
pH, electrical conductivity, ammonia ion content, sulphur
content, and others. The following is the recommended
standard water quality.
Item
Chilled water system Tendency (1)
Circulating
water (20°C
less than)
Supply
water
Corrosion
Deposits
of scales
Standard Quality pH
(25 °C)
6.8 ~ 8.0 6.8 ~ 8.0
Electrical Conductivity
(mS/m) (25 °C)
{µS/cm} (25 °C)
(2)
Less than 40
Less than 400
Less
than 30
Less
than 300
Chlorine Ion
(mg CI¯/I)
Less than 50
Less
than 50
Sulphur Acid Ion
(mg H
4
SO¯/I)
Less than 50
Less
than 50
The amount of Acid
consumption (pH 4.8)
(mg CaCO
3
/I)
Less than 50
Less
than 50
Total Hardness
(mg CaCO
3
/I)
Less than 70
Less
than 70
Calcium Hardness
(mg CaCO
3
/I)
Less than 50
Less
than 50
Silica L (mg SIO
2
/I) Less than 30
Less
than 30
Reference Quality
Total Iron (mg Fe/I)
Less than 1.0
Less
than 0.3
Total Copper
(mg Cu/I)
Less than 1.0
Less
than 0.1
Sulphur Ion (mg S
2¯
/I) It shall not be detected
Ammonium Ion (mg
NH
4
+
/I)
Less than 1.0
Less
than 0.1
Remaining Chlorine
(mg CI/I)
Less than 0.3
Less
than 0.3
Floating Carbonic Acid
(mg CO
2
/I)
Less than 4.0
Less
than 4.0
Index of Stability 6.8 ~ 8.0 -
the tendency of corrosion or deposits of scales.
the former unit.
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