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MULTI V Water IV
4. Water Control
4.2 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
performance deterioration to the air conditioner and severe problem to the product
Items
pH [25C]
Conductivity [25C] (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
Ammonium ion (mg NH
Residual chlorine (mg CI / )
Free carbon dioxide (mg CO
Stability index
Note
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.
Heat Pump
Circulating
Basic Item
2
/ )
4
/ )
3
/ )
3
/ )
3
/ )
2
Reference Item
Must not be
2
/ )
4
+ / )
4
Below 0.25
/ )
2
Closed type
Supplemented
water
water
7.0~8.0
7.0~8.0
Below 30
Below 30
Below 50
Below 50
Below 50
Below 50
Below 50
Below 50
Below 70
Below 70
Below 50
Below 50
Below 30
Below 30
Below 1.0
Below 0.3
Below 1.0
Below 0.1
Must not be
detected
detected
Below 0.3
Below 0.1
Below 0.3
Below 0.4
Below 4.0
-
-
Installation of Outside Units
Effect
Corrosion
Scale
O
O
O
O
O
-
O
O
-
O
-
O
-
O
-
O
O
O
O
-
O
-
O
-
O
-
O
-
O
O
7
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