Johnson Controls York YHAU-CGH-CXR Series, Installation, Commissioning, Operation, And Maintenance

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Table 36: Chilled/hot and cooling water quality control (maximum concentrations)
Cooling water system
(4)
Circulating type
Non- circulating
water
Chilled/hot water system
Tendency
(2)
Element
(1) (6)
Circulating water
Replenish
water
Passing water
Circulating
water (77°F
(25°C) or lower)
Replenish
water
Corrosion
Scale
forming
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)
(68°F (20°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
(mgClˉ/l)
Max. 200 Max. 50 Max. 50 Max. 50 Max. 50 O
Sulfulic
Acid Ion
(mgSO
4
2
ˉ/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
Standard items
Ionized Silica
(mgS
i
O
3
/I)
Max. 50 Max. 30 Max. 30 Max. 30 Max. 30 O
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
3
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 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
Reference items
Stability Index 6.0~7.0 – – – – O O
Note:
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.
Model YHAU-CGN/H-CXR(M)Double Effect Direct Fired Small Absorption Chiller-Heater 162