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LG Air-Cooled Cooling Only Inverter Scroll Chiller Installation and Owners Manual
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.
Category
ecneulfnImetsys epyt delaeS
Heat source water
Supplementary water
Corrosion Scale
Basic category
pH [25 °C] 7.0~8.0 7.0~8.0 O O
Electrical conductivity [25 °C](mS/m) 30 or less 30 or less O O
Chloride ion(mg CI- /l)
50 or less 50 or less O -
Sulfate ion(mg SO
4²-/l)
50 or less 50 or less O -
Acid consumption [pH 4.8] (mg CaCO
3/l)
50 or less 50 or less - O
Total hardness (mg CaCO
3/l)
70 or less 70 or less - O
Calcium hardness (mg CaCO
3/l)
50 or less 50 or less - O
Ion-silica (mg SiO
2/l)
30 or less 30 or less - O
Reference category
Iron (mg Fe/l)
1.0 or less 0.3 or less O O
Copper (mg Cu/l)
1.0 or less 0.1 or less O -
Sulfate ion(mg S²/l)
Shall not be detected Shall not be detected
O -
Ammonium ion(mg NH+
4/l)
0.3 or less 0.1 or less O -
Remaining chlorine (mg Cl/l)
0.25 or less 0.3 or less O -
Free carbon dioxide (mg CO
2/l)
0.4 or less 4.0 or less O -
OO--xedni ytilibatS
[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
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