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Inverter Hybrid Boiler
48
Criteria for water quality control
W
ater
qual
ity contr
ol
Water containing a large amount of impurities causes corrosion or scaling in the
condenser and piping, which may affect the performance and life of the product.
To ensure the use of water that complies with the local or national codes, you should
perform a water quality test.
- Water quality control should be performed in accordance with the criteria shown below.
If you don't control the water quality according to the standards given in the table below,
it may performance deterioration or abnormalities in the product.
Item
Sealed system
Impact
Circulation water Refilling water Corrosion Scale
Basic item
pH
[
25
℃]
7.0~8.0
7.0~8.0
O
O
Electrical conductivity
[
25
℃]
(mS/m)
≤ 30
≤ 30
O
O
Chloride ion (mg Cl
-
/ℓ)
≤ 50
≤ 50
O
-
Sulfate ion (mg S-O/ℓ)
≤ 50
≤ 50
O
-
Acid consumption
[
pH 4.8
]
(mg CaCO
₃
/ℓ)
≤ 50
≤ 50
-
O
Total hardness (mg CaCO
₃
/ℓ)
≤ 70
≤ 70
-
O
Calcium hardness (mg CaCO
₃
/ℓ)
≤ 50
≤ 50
-
O
Ionic silica (mg SiO
₂
/ℓ)
≤ 30
≤ 30
-
O
Reference
Iron (mg Fe/ℓ)
≤ 1.0
≤ 0.3
O
O
Copper (mg Cu/ℓ)
≤ 1.0
≤ 0.1
O
-
Sulfate ion (mg S
2
/ℓ)
Should not be
detected
Should not be
detected
O
-
Ammonium ion (mg NH
4
+
/ℓ)
≤ 0.3
≤ 0.1
O
-
Residual chlorine (mg Cl/ℓ)
≤ 0.25
≤ 0.3
O
-
Free carbon dioxide (mg CO
2
/ℓ)
≤ 0.4
≤ 4.0
O
-
Stability Index
-
-
O
O
Reference
● The circular marks in the corrosion and scale columns indicate potential
occurrence.
● When iron without protective coating is exposed to water with a temperature of
40
℃
or higher, corrosion may occur. Addition of an anticorrosive agent or air vent
may moderate corrosion.
● 15 items in the table above are general causes of corrosion and scaling.