ENGLISH-118
Cooling water management
1. Standard of cooling water quality for air conditioning and the number of water quality inspection
❋
Make sure to comply the standard for water quality management.
f
Cooling water with high level of foreign substances can cause pipe corrosion or creation of water scale which effects the
product's performance and lifespan. (Use the appropriate heat source water according to the below table) If the system
water is sourced from anything other than the local water supply, make sure to check the quality of water.
❋
For water quality management on the heat source water of closed circuit water cooling must be done according to the
below table. If the water quality is not managed according to the below table, it may decrease the performance of air
conditioner and cause serious problem on the product.
Classification Item
Closed type system
Effects
Recommended
number for water
quality inspection
Circulating
water
Supplemented
water
Corrosion
Scale
Standard
value
pH[25 °C (77 °F)]
7.0 ~ 8.0
7.0 ~ 8.0
❍
❍
Twice a month
Electric conductivity
[25 °C (77 °F)](mS/m)
30 or below
30 or below
❍
❍
Chloride ion (mg Cl
-
/L)
50 or below
50 or below
❍
Once a month
Sulfate ion (mg S0
4
2-
/L)
50 or below
50 or below
❍
❍
M alkali level [pH 4.8]
(mg CaCo
3
/L)
50 or below
50 or below
❍
Total hardness (mg CaCo
3
/L)
70 or below
70 or below
❍
Calcium hardness
(mg CaCo
3
/L)
50 or below
50 or below
❍
Ionized silica (mg SiO
2
/L)
30 or below
30 or below
❍
Reference
Iron (mg Fe/L)
1.0 or below
0.3 or below
❍
❍
Once a month
Copper (mg Cu/L)
1.0 or below
1.0 or below
❍
Sulfate ion (mg S
2-
/L)
Not to be
detected
Not to be
detected
❍
Ammonium ion (mg NH
4
+
/L)
0.3 or below
0.1 or below
❍
Residual chlorine (mg Cl/L)
0.25 or below
0.3 or below
❍
Free carbon dioxide
(mg CO
2
/L)
0.4 or below
0.4 or below
❍
Stability index
-
-
❍
❍
t
Circle (O) denotes the factor relevant to corrosion or water scale.
t
When the water temperature is over 40˚C (104˚F), steel without protective coating may corrode when exposed
to water. Applying corrosion prevention material or degassing can be an effective measure to prevent corrosion.
t
For the cooling water and the make-up water, used under closed circuit water system with closed circuit cooling
tower, should satisfy the standard shown in above table.
t
Supplied water or make-up water should be tap water, industrial water or groundwater. Purified water,
neutralized water and softened water should not be supplied.
t
15 items in the above table is a typical factor for corrosion and/or water scale.
CAUTION
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