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WATER SYSTEM MAINTENANCE
Heat source water quality management standard table
Water with a lot of foreign object causes corrosion or scale generation in the condenser and pipe
and may affect the performance and lifespan.
Use heat source water suitable for [Environment Policy Basic Act Enforcement Ordinance Envi-
ronment Standard].
If water other than tab water is used in the cooling tower water supply, make sure to have water
quality inspection.
- Heat source water quality management shall follow the standard table below.
If heat source water is not managed according to the water quality standard table, it may cause
air conditioner performance degradation or severe product problem.
Electrical conductivity [25 °C](mS/m)
Chloride ion(mg CI- /l)
Sulfate ion(mg SO
Acid consumption [pH 4.8] (mg CaCO
Total hardness (mg CaCO
Calcium hardness (mg CaCO
Ion-silica (mg SiO
Iron (mg Fe/l)
Copper (mg Cu/l)
Sulfate ion(mg S²/l)
Ammonium ion(mg NH+
Remaining chlorine (mg Cl/l)
Free carbon dioxide (mg CO
t S
[Reference]
(1) O mark in the corrosion and scale field means the possibility of generation.
(2) If the water temp. is 40 °C or higher, the iron without protective coating may have corrosion
when it is exposed to water, and addition of anti-corrosion solution or air purge may have a
good effect.
(3) In the sealed type circuit using sealed type cooling tower, coolant and supplementary
water shall satisfy the water quality standard of the sealed type system in the table.
(4) You shall supply tab water, industrial water, or underground water, excluding purified water,
neutral water, and soft water, for supplementary water and supplied water.
(5) The 15 categories in the table are the general causes of corrosion and scale generation
114
Category
Heat source water Supplementary water
pH [25 °C]
7.0~8.0
30 or less
50 or less
²-/l)
50 or less
4
/l)
50 or less
3
/l)
70 or less
3
/l)
50 or less
3
/l)
30 or less
2
1.0 or less
1.0 or less
Shall not be detected Shall not be detected
/l)
0.3 or less
4
0.25 or less
/l)
0.4 or less
2
b a
t i l i
i y
d n
x e
Due to our policy of continuous product innovation, some specifications may change without notification.
©LG Electronics U.S.A., Inc., Englewood Cliffs, NJ. All rights reserved. "LG" is a registered trademark of LG Corp.
S
e
l a
d e
y t
e p
s
s y
e t
m
Basic category
7.0~8.0
30 or less
50 or less
50 or less
50 or less
70 or less
50 or less
30 or less
Reference category
0.3 or less
0.1 or less
0.1 or less
0.3 or less
4.0 or less
-
-
n I
u l f
n e
e c
Corrosion
Scale
O
O
O
O
O
-
O
-
-
O
-
O
-
O
-
O
O
O
O
-
O
-
O
-
O
-
O
-
O
O
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