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Installation of Outside Unit
7. Water Control
7.2 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 performance deterioration to the air conditioner and severe problem to the product.
Items
Basic
pH [25C]
Conductivity [25C] (mS/m)
Chlorine ions (mg Cl- / ℓ)
2
Sulfate ions (mg SO
/ ℓ)
4
Acid consumption (pH4.8) (mg CaCO
Total hardness (mg CaCO
3
Calcium hardness (mg CaCO
Ionic-static silica (mg SiO
2
Reference
Iron (mg Fe / ℓ)
Copper (mg Cu / ℓ)
2
Sulfate ion (mg SO
/ ℓ)
4
Ammonium ion (mg NH
+ / ℓ)
4
Residual chlorine (mg CI / ℓ)
Free carbon dioxide (mg CO
Stability index
• The "O" mark for corrosion and scale means that there is possibility of occurrence.
• 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.
• 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.
• Supplementing water and supplied water must be supplied with tap water, industrial water and underground water excluding filtered water,
neutral water, soft water etc.
• 15 items in the table are general causes of corrosion and scale.
Circulating water
7.0~8.0
Below 30
Below 50
Below 50
/ ℓ)
Below 50
3
/ ℓ)
Below 70
/ ℓ)
Below 50
3
/ ℓ)
Below 30
Below 1.0
Below 1.0
Must not be detected Must not be detected
Below 0.3
Below 0.25
/ ℓ)
Below 0.4
2
Closed Type
Supplemented wate
r
7.0~8.0
Below 30
Below 50
Below 50
Below 50
Below 70
Below 50
Below 30
Below 0.3
Below 0.1
Below 0.1
Below 0.3
Below 4.0
-
-
23
Installation
Effect
Corrosion
Scale
O
O
O
O
O
-
O
O
-
O
-
O
-
O
-
O
O
O
O
-
O
-
O
-
O
-
O
-
O
O
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