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JOHNSON CONTROLS
105
SECTION 7 – MAINTENANCE
FORM 155.35-ICOM2.EN.CE/GB (1018)
DATE: 10/30/2018
7
TABLE 24 -
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), noticeable corrosion develops, 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 qual-
ity 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
softened water are excluded.
6. The items shown in the table above are representative factors in corrosion and scale formation. Storage Method of the Chiller-Heater