JOHNSON CONTROLS
153
SECTION 7 – MAINTENANCE
FORM 155.32-ICOM1.EN.GB
ISSUE DATE: 10/13/2017
7
TABLE 39 -
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/m) (25°C)
(µS/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/l)
Max. 200
Max. 50
Max. 50
Max. 50
Max. 50
Sulfulic Acid Ion
(mgSO
4
2
ˉ/I)
Max. 200
Max. 50
Max. 50
Max. 50
Max. 50
Acid
Consumption
(PH4.8)
(mgCaCO
3
/I)
Max. 100
Max. 50
Max. 50
Max. 50
Max. 50
Total Hardness
(mgCaCO
3
/I)
Max. 200
Max. 70
Max. 70
Max. 70
Max. 70
Calcium
Hardness
(mgCaCO
3
/I)
Max. 150
Max. 50
Max. 50
Max. 50
Max. 50
Ionized Silica
(mgS
i
O
3
/I)
Max. 50
Max. 30
Max. 30
Max. 30
Max. 30
REFERENCE ITEMS
Iron (mgFe/I)
Max. 1.0
Max. 0.3
Max. 1.0
Max. 1.0
Max. 0.3
Copper (mgCu/I)
Max. 0.3
Max. 0.1
Max. 0.1
Max. 0.1
Max. 0.1
Sulfurization Ion
(mgS
2
ˉ/I)
NO IONS ALLOWED
Ammonium Ion
(mgNH
4
+/I)
Max. 1.0
Max. 0.1
Max. 1.0
Max. 1.0
Max. 0.1
Residual
Chlorine
(mgCI/I)
Max. 0.3
Max. 0.3
Max. 0.3
Max. 0.3
Max. 0.3
Free Carbonate
Acid (mgCO
2
/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/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
softened water are excluded.
6. The 15 items shown above are representative factors in corrosion and scale formation.
