Ma
Int
E
nan
CE
69
English
Item
Chilled water system
Heating water system
Effect
low level medium temperature
heating gauge
Circulation water
(Below 20 °C )
Supply water
Circulation water
(over 20 °C below
60 °C)
Supply
water
Corrosion
Forming
scale
Basic item
pH (25 °C)
6.8 ~ 8.0
6.8 ~ 8.0
7.0 ~ 8.0
7.0 ~ 8.0
O
O
Electric
conductivity
(mS/m, 25 °C)
{μS/cm, 25 °C}
Below 40
{Below 400}
Below 30
{Below 300}
Below 30
{Below 300}
Below 30
{Below 300}
O
O
Chloride ion
(mgCl
-
/l)
Below 50
Below 50
Below 50
Below 50
O
Sulfate ion
(mgSO
4
2-
/l)
Below 50
Below 50
Below 50
Below 50
O
Basic item
Acid
consumption
(pH4.8,
mgCaCO
3
/l)
Below 50
Below 50
Below 50
Below 50
O
Full hardness
(mgCaCO
3
/l)
Below 70
Below 70
Below 70
Below 70
O
Calcium hardness
(mgCaCO
3
/l)
Below 50
Below 50
Below 50
Below 50
O
Ion-like silica
(mgSiO
2
/l)
Below 30
Below 30
Below 30
Below 30
O
Reference
item
Iron (mgFe/l)
Below 1.0
Below 0.3
Below 1.0
Below 0.3
O
Copper (mgCu/l)
Below 1.0
Below 0.1
Below 1.0
Below 0.1
O
Sulfide ion
(mgS
2-
/l)
Not detected
Not detected
Not detected
Not
detected
O
Ammonium ion
(mgNH
4
+
/l)
Below 1.0
Below 0.1
Below 0.3
Below 0.1
O
Chlorine residual
(mgCl/l)
Below 0.3
Below 0.3
Below 0.25
Below 0.3
O
Free carbon
(mgCO
2
/l)
Below 4.0
Below 4.0
Below 0.4
Below 4.0
O
notE
• Circle (O) marks in the chart show the factor relevant to corrosion or water scale.
• When the water temperature is over 40 ˚C, steels without protective coating may corrode when expose to
water. Applying corrosion prevention material or degassing can be effective measure to prevent corrosion.
• Circulating water and supply water should satisfy the standard shown in the table.
• Supplied water or make-up water should be supplied by purified water, neutralized water, tap water except
softened water, and industrial water.
• 14 items in the table is a typical factor for corrosion and/or water scale.
DB68-05916A-09_IM_DVM Chiller Outdoor_EU_EN_.indd 69
2022-05-02 오전 9:00:14
