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JOHNSON CONTROLS
110
FORM 155.33-ICOM2.EN.GB
ISSUE DATE: 12/4/2017
SECTION 7 – MAINTENANCE
TABLE 23 -
CHILLED / HOT AND COOLING WATER QUALITY CONTROL (MAXIMUM CONCENTRATIONS)
ELEMENT
(1) (6)
COOLING WATER SYSTEM
(4)
CHILLED / HOT WATER
SYSTEM
TENDENCY
(2)
CIRCULATING
TYPE
NON-
CIRCULATING
WATER
CIRCULATING
WATER
REPLENISH
WATER
PASSING
WATER
CIRCULATING
WATER
(20 °C OR
LOWER)
REPLENISH
WATER
CORROSION
SCALE FORMING
ST
ANDARD ITEMS
pH (25°C) 6.5~8.2 6.0~8.0 6.8~8.0 6.8~8.0 6.8~8.0
Electric
Conductivity (mS
per m) (25 °C)
(µS per cm) (25°C)
(1)
Max. 80
(Max. 800)
Max. 30
(Max. 300)
Max. 40
(Max. 400)
Max. 40
(Max. 400)
Max. 30
(Max. 300)
Chloride Ion
(mgClˉ per l)
Max. 200 Max. 50 Max. 50 Max. 50 Max. 50
Sulfuric Acid Ion
(mSO
4
2
ˉ per I)
Max. 200 Max. 50 Max. 50 Max. 50 Max. 50
Acid Consumption
(PH 4.8)
(mgCaCO
3
per I)
Max. 100 Max. 50 Max. 50 Max. 50 Max. 50
Total Hardness
(mgCaCO
3
per I)
Max. 200 Max. 70 Max. 70 Max. 70 Max. 70
Calcium Hardness
(mgCaCO
3
per I)
Max. 150 Max. 50 Max. 50 Max. 50 Max. 50
Ionized Silica
(mgS
i
O
3
per I)
Max. 50 Max. 30 Max. 30 Max. 30 Max. 30
REFERENCE ITEMS
Iron (mgFe per I) Max. 1.0 Max. 0.3 Max. 1.0 Max. 1.0 Max. 0.3
Copper (mgCu
per I)
Max. 0.3 Max. 0.1 Max. 0.1 Max. 0.1 Max. 0.1
Sulfurization Ion
(mgS
2
ˉ per I)
NO IONS ALLOWED
Ammonium Ion
(mgNH
4
+
per I)
Max. 1.0 Max. 0.1 Max. 1.0 Max. 1.0 Max. 0.1
Residual Chlorine
(mg CI per I)
Max. 0.3 Max. 0.3 Max. 0.3 Max. 0.3 Max. 0.3
Free Carbonate
Acid (mgCO
2
per I)
Max. 4.0 Max. 4.0 Max. 4.0 Max. 4.0 Max. 4.0
Stability Index 6.0~7.0 – – – –
NOTES:
1. The item names, their definitions, and units are based on JIS K 0101. Units and figures in braces are those which were used formerly. They are
shown here for reference purposes.
2. In the "Tendency" column, a white circle ( ) indicates that a particular item is a factor in corrosion and scale formation.
3. Generally speaking, when the water temperature is high (40 °C or higher), corrosion develops noticeably. Especially when steel material which
makes direct contact with water has no protective covering, it is desirable to provide a suitable corrosion-preventive measure, such as adding a
corrosion-preventive agent or applying deaeration treatment.
4. In a cooling water system using a closed cooling tower, the closed-circuit circulating water and its replenishment water shall meet the quality
standards for a hot water system, and the sprinkling water and its replenishment water shall meet the quality standards for a circulation-type
cooling water system.
5. The supply water and replenishment water shall be tap water, industrial water, or ground water. Demineralized water, neutral water, and soft-
ened water are excluded.
6. The 15 items shown above are representative factors in corrosion and scale formation.