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FORM 155.32-ICOM2.EN.UL SECTION 7 – MAINTENANCE
ISSUE DATE:1/10/2018
JOHNSON CONTROLS 148
Table 41 - Chilled/Hot and Cooling Water Quality Control (Maximum Concentrations)
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 (O) indicates that a particular item is a factor in corrosion/scale formation.
3. Generally speaking, when the water temperature is high (104°F (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. Do NOT use demineralized water, neutral water, or softened water.
6. The items shown above are representative factors in corrosion and scale formation.
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
SCAL
E
FO
RMIN
G
ST
ANDA
RD IT
EMS
pH 77 °F (25 °C) 6.5~8.2 6.0~8.0 6.8~8.0 6.8~8.0 6.8~8.0 O O
Electric Conductivity (mS/
m) 77 °F(25 °C)
(µS/cm) 77 °F(25 °C)
(1)
Max. 80
(Max. 800)
Max. 30
(Max. 300)
Max. 40
(Max. 400)
Max. 40
(Max. 400)
Max. 30
(Max. 300)
O O
Chloride Ion
(mgCl
¯
/l)
Max. 200 Max. 50 Max. 50 Max. 50 Max. 50 O
Sulfulic Acid Ion (mgSO
4
2¯
/
I)
Max. 200 Max. 50 Max. 50 Max. 50 Max. 50 O
Acid Consumption (PH4.8)
(mgCaCO
3
/I)
Max. 100 Max. 50 Max. 50 Max. 50 Max. 50 O
Total Hardness
(mgCaCO
3
/I)
Max. 200 Max. 70 Max. 70 Max. 70 Max. 70 O
Calcium Hardness
(mgCaCO
3
/I)
Max. 150 Max. 50 Max. 50 Max. 50 Max. 50 O
Ionized Silica (mgSiO
3
/I)
Max. 50 Max. 30 Max. 30 Max. 30 Max. 30 O
REFERENC
E I
T
EMS
Iron (mgFe/I) Max. 1.0 Max. 0.3 Max. 1.0 Max. 1.0 Max. 0.3 O O
Copper (mgCu/I) Max. 0.3 Max. 0.1 Max. 0.1 Max. 0.1 Max. 0.1 O
Sulfurization Ion (mgS
2¯
/I)
NO IONS ALLOWED O
Ammonium Ion (mgNH
4
+/I)
Max. 1.0 Max. 0.1 Max. 1.0 Max. 1.0 Max. 0.1 O
Residual Chlorine (mgCI/I) Max. 0.3 Max. 0.3 Max. 0.3 Max. 0.3 Max. 0.3 O
Free Carbonate Acid
(mgCO
2
/I)
Max. 4.0 Max. 4.0 Max. 4.0 Max. 4.0 Max. 4.0 O
Stability Index
6.0~7.0 – – – – O O