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Water pipe installation
Section
pH[25 ˚C]
Electric conductivity [25 ˚C](mS/m)
Chloride ion (mg Cl
Sulfate ion (mg S0
Standard
value
M alkali level [pH 4.8](mg CaCo
Total hardness (mg CaCo
Calcium hardness (mg CaCo
Ionized silica (mg SiO
Iron (mg Fe/L)
Copper (mg Cu/L)
Sulfate ion(mg S
Reference
Ammonium ion (mg NH
Residual chlorine (mg Cl/L)
Free carbon dioxide (mg CO
Stability index
• Circle (O) marks in the chart show the factor relevant to corrosion or water scale.
• When the water temperature is over 40
NOTE
Applying corrosion prevention material or degassing can be effective measure to prevent corrosion.
• 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.
• 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.
• 15 items in the above table is a typical factor for corrosion and/or water scale.
• When water pipe circuit freezes, it will cause breakage on the plate type heat exchanger. Therefore appropriate
preventive measure must be taken according to the situation.
- Drain remaining water in the water pipe
- Constantly operate the water pump to circulate the water within the water pipe
- Install a self-regulating heat cable on the water pipe
• Open the valve of the water pipe connected to the outdoor unit after flushing (cleaning foreign substances in
water pipe) is completed.
• Check that air is vented from the water pipe and circulation amount is secured before opening the service valve
on the refrigerant side of the outdoor unit.
• When circulating water stops during outdoor nit operation, it may cause breakage on plate type heat exchanger.
18
DVM HYDRO UNIT_IM_E_03469A(1).indd 18
Closed circuit system
Item
Heat source
water
7.0 ~ 8.0
30 and below
-
/L)
50 and below
/L)
50 and below
2 -
4
/L)
50 and below
3
/L)
70 and below
3
/L)
50 and below
3
/L)
30 and below
2
1.0 and below
1.0 and below
Not to be
/L)
2
detected
+
/L)
0.3 and below
4
0.25 and below
/L)
0.4 and below
2
-
˚C, steels without protective coating may corrode when expose to water.
Effects
Make-up water
Corrosion
Scale
7.0 ~ 8.0
O
30 and below
O
50 and below
O
50 and below
O
50 and below
70 and below
50 and below
30 and below
0.3 and below
O
1.0 and below
O
Not to be
O
detected
0.1 and below
O
0.3 and below
O
0.4 and below
O
-
O
Recommended
number for water
quality inspection
O
Twice a month
O
O
Once a month
O
O
O
O
Once a month
O
2012-11-21 오후 2:32:20
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