Pressure Loss; Pump Characteristic; Corrosion Protection - OEG SecuFresh 22 Montage- Und Bedienungsanleitung

20
3.3

Pressure loss /

Pump characteristic

3.4

Corrosion protection

GB
8
7
6
5
4
3
2
1
0
0 0,2 0,4 0,6
To prevent corrosion damage to plate heat exchangers, the following drinking water
values must be observed:
Permissible values in the drinking water for copper-brazed stainless steel plate heat
exchangers [SS 316/1.4404]
Chloride 1 (CL - )
1 2-
Sulphate (SO 4 )
Nitrate (NO 3 -)
pH value
Electrical conductivity (at 25°C)
Hydrogen carbonate (HCO 3 -
- 2-
Ratio HCO 3 / SO 4
+
Ammonia (NH 4 )
Free chlorine gas
Sulphite
Hydrogen sulphide (H 2 S)
Free (aggressive) carbon dioxide (CO 2 )
Iron (Fe)
Ammonium
Manganese (Mn)
Overall hardness °dH
Total organic carbon (TOC)
1 If the limit values for copper-soldered plate heat exchangers are exceeded, a solid
stainless steel plate heat exchanger must be used. To prevent pitting corrosion in the
domestic installation, no new galvanised iron material must be installed downstream in
the hot water pipe of the copper-soldered plate heat exchanger without forming a
protective layer. Solid stainless steel plate heat exchangers must be used in mixed
installations with zinccoated iron materials.
SecuFresh 22 and SecuFresh 29 Frischwasserstation
0,8 1 1,2 1,4 1,6
< 250 mg/l at +50 °C
< 100 mg/l at +75 °C
< 10 mg/l at +90 °C
< 100 mg/l
< 100 mg/l
10 - 500 μS/cm
) 70 - 300 mg/l
Ratio > 1,0
< 0.5 mg/l
< 0.05 mg/l
< 0.2 mg/l
< 0.05 mg/l
4 - 14 (ratio [Ca,Mg] / [HCO3] > 0.5)
< 30 mg/l
0,8
0,7
0,6
0,5
Wilo Para 15/6
0,4
SecuFresh 22
0,3
SecuFresh 29
0,2
0,1
0
1,8
[m 3 /h]
7.5 - 9.0
< 2 mg/l
< 1 mg/l
< 5 mg/l
< 2 mg/l