York YHAU-CW - TABLE 32 - Chilled and Cooling Water Quality Control (Maximum Concentrations)

JOHNSON CONTROLS
149
SECTION 7 – MAINTENANCE
FORM 155.31-ICOM2.EN.UL
ISSUE DATE: 12/21/2018
7
TABLE 32 - CHILLED AND COOLING WATER QUALITY CONTROL (MAXIMUM CONCENTRATIONS)
ELEMENT
(1) (6)
COOLING WATER SYSTEM
(4)
CHILLED WATER SYSTEM TENDENCY
(2)
CIRCULATING
TYPE
NON-
CIRCULATING
WATER
CIRCULATING
WATER
REPLENISH
WATER
PASSING
WATER
CIRCULATING
WATER
(68°F OR
LOWER)
REPLENISH
WATER
CORROSION
SCALE
FORMING
STANDARD ITEMS
pH (77 °F) 6.5~8.2 6.0~8.0 6.8~8.0 6.8~8.0 6.8~8.0
Electric
Conductivity
(mS/m) (77 °F)
(µS/cm) (77 °F)
(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 denitions, and units are based on JIS K 0101. Units and gures in parentheses () are those which were previously
used. 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 (104 °F 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 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.