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25
ENGLISH
7-5. Water Quality Management Standard
Neglecting management of the cold water and coolant may cause not only the deterioration of the heat exchanging
function due to adhesion of the scale but also serious accidents such as corrosion, insulation and deterioration inside
the machine due to inflow of the water that causes damage of the heat pipe by corrosion and pitting corrosion of the
heat pipe. This requires a lot of costs and time.
!
CAUTION
LG Electronics does not take any responsibility for corrosion-related problems due to water quality management
problems as corrosion accidents are caused by external factors mostly.
Prevent accidents by enough management
Causes of scale adhesion and corrosion are various and counter actions are not uniform. As this Centrifugal Chiller is
designed for the water quality that is set by the cold water/coolant water quality management standard of the Korean
industrial standard, make sure to maintain enough water quality managements to be qualified to this water quality
standard.
Refer to the instruction manual for detailed water quality management methods.
Notes)
(1) Names and units of items comply with KS MD 100.
(2) O mark in the table represents that the factor is related to the tendency of the corrosion or generation of scale.
(3) Units and number in ( ) is existing units for your reference
(4) In case a temperature is high(above 40°C), corrosion possibility is generally high and in case of steel material espe-
cially, it is desirable to establish measures effective to water such as addition of water proof chemicals and de-aer-
ation when steel materials contact water directly without protection films.
Items
Coolant system
Cold water system
Tendency
Circulation system
Routine
system
Circulating
water
Makeup
water
Routine
water
Circulating
water
(Below 20°C)
Makeup
water
Corrosion
Generation
of scale
Standard item
below 80
below 800
below 30
below 300
below 40
below 400
below 40
below 400
below 30
below 300
Reference item
Not
detected
Not
detected
Not
detected
Not
detected
Not
detected
pH(25°C)
Electric conductivity
(Ma/m)(25°C) (
㎲
/cm) (25°C)
Chloride ion (mgCl
 ̄
/L)
Sulfuric ion (mgSO
4
2
 ̄
/L)
Acid consumption (pH4.8)
(mgCaCO
3
/L)
Total hardness (mgCaCO
3
/L)
Calcium hardness (mgCaCO
3
/L)
Ion silica (mgSiO
2
/L)
Iron (mgFe/L)
Copper (mgCu/L)
Sulfide ion (mgSO
2
 ̄
/L)
Ammonium ion (mgNH
4
+/L)
Residual chlorine (mgCl/L)
Free carbon dioxide (mgCO
2
/L)
Stability index
6.5~8.2 6.0~8.0 6.8~8.0
6.8~8.0 6.8~8.0
ㅇ
ㅇ
ㅇ
ㅇ
below 200
below 50
below 50
below 50
below 50
ㅇ
below 200
below 50
below 50
below 50
below 50
ㅇ
below 100
below 50
below 50
below 50
below 50
ㅇ
below 200
below 70
below 70
below 70
below 70
ㅇ
below 150
below 50
below 50
below 50
below 50
ㅇ
below 50
below 30
below 30
below 30
below 30
ㅇ
below 1.0
below 0.3
below 1.0
below 1.0
below 0.3
ㅇ
below 0.3
below 0.1
below 1.0
below 1.0
below 0.1
ㅇ
ㅇ
ㅇ
below 1.0
below 0.1
below 1.0
below 1.0
below 0.1
ㅇ
below 0.3
below 0.3
below 0.3
below 0.3
below 0.3
ㅇ
below 4.0
below 4.0
below 4.0
below 4.0
below 4.0
ㅇ
5.0~7.0
ㅡ
ㅡ
ㅡ
ㅡ
ㅇ
ㅇ
Table 7. Cold Water/Coolant Water Quality Management Standard
Summary of Contents for RCWFL Series
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