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3.2 Standard table for water purity control
The water may contain many foreign substances and hence may influence the performance and lifetime of the product
due to the corrosion of the condenser and water pipe. (Use water source that complies with the below standard table for
water purity control.)
If you use water supply other than the tap water to supply the water for the cooling tower, you must do a water quality
inspection.
• If you use the closed cooling tower, the water quality must be controlled in accordance with the following standard
table.
If you do not control the water quality in accordance with the following standard water quality table, it can cause perfor-
mance deterioration to the air conditioner and severe problem to the product
Items
pH [25°C]
Conductivity [25°C] (mS/m)
Chlorine ions (mg Cl - / )
Sulfate ions (mg SO
Acid consumption (pH4.8) (mg CaCO
Total hardness (mg CaCO
Calcium hardness (mg CaCO
Ionic-static silica (mg SiO
Iron (mg Fe / )
Copper (mg Cu / )
Sulfate ion (mg SO
4
Ammonium ion (mg NH
Residual chlorine (mg CI / )
Free carbon dioxide (mg CO
Stability index
[Reference]
(1) The "O" mark for corrosion and scale means that there is possibility of occurrence.
(2) When the water temperature is 40°C or above or when uncoated iron is exposed to the water, it can result in corrosion.
Therefore adding anti-corrosion agent or removing the air can be very effective.
(3) In case of using the closed type cooling tower, the cooling water and supplementing water must satisfy the water quality
criteria of closed type system in the table.
(4) Supplementing water and supplied water must be supplied with tap water, industrial water and underground water
excluding filtered water, neutral water, soft water etc.
(5) 15 items in the table are general causes of corrosion and scale.
Installation
Closed type
Circulating water
Basic Item
7.0~8.0
Below 30
Below 50
2
/ )
Below 50
4
/ )
Below 50
3
/ )
Below 70
3
/ )
Below 50
3
/ )
Below 30
2
Reference Item
Below 1.0
Below 1.0
2
/ )
Must not be detected
+
/ )
Below 0.3
4
Below 0.25
/ )
Below 0.4
2
-
Supplemented water
Corrosion
7.0~8.0
O
Below 30
O
Below 50
O
Below 50
O
Below 50
Below 70
Below 50
Below 30
Below 0.3
O
Below 0.1
O
Must not be detected
O
Below 0.1
O
Below 0.3
O
Below 4.0
O
-
O
Effect
Scale
O
O
-
O
-
O
-
O
-
O
-
O
O
-
-
-
-
-
O
6
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