Corrosion Protection - Tuxhorn tubra-FRISTA KL Instructions De Montage Et D'utilisation

Connections
HVL
HRL
WW
KW
ZI
4.3

Corrosion protection

To prevent corrosion damage to plate heat exchangers, the following drinking water values
must be observed:
Maximum permitted drinking water values in conjunction with stainless steel plate
heat exchangers [SS 316/1.4404]
1 -
Chloride (CL )
1
2-
Sulphate (SO )
4
Nitrate (NO -)
3
pH value
Electrical conductivity* (at 25°C)
Hydrogen carbonate (HCO
-
2-
Ratio HCO /SO
3 4
+
Ammonia (NH )
4
Free chlorine gas
Sulphite
Ammonium
Hydrogen sulphide (H
Free (aggressive) carbon dioxide
(CO )
2
Iron (Fe)
Saturation index
Aluminium (Al)
Manganese (Mn)
Degree of hardness
Total organic carbon
1
It is not permitted to use the fresh water station if the limit values are exceeded.
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 zinc-
coated iron materials.
Art.-Nr. 907.75.02.00
Last updated 2022/08/29
Heating flow
Heating return
Hot water
Cold water
Circulation
Copper-soldered
< 100 mg/l
< 100 mg/l
7.5 - 9.0
10 – 500 µS/cm
-
) 70 -300 mg/l
3
Ratio > 1.0
< 2 mg/l
< 1 mg/l
S) < 0.05 mg/l
2
< 5 mg/l
< 0.2 mg/l
-0,2 < 0 < 0,2
< 0.2 mg/l
< 0.1 mg/l
< 250 mg/l at 50°C
< 100 mg/l at 75°C
< 10 mg/l at 90°C
< 0,5 mg/l
< 2 mg/l
4 – 14 [Ca
2+
; Mg
< 30 mg/l
- 7 -
GB
Solid stainless steel
< 400 mg/l
No requirement
6 - 10
No requirement
No requirement
No requirement
No requirement
< 7 mg/l
No requirement
No requirement
No requirement
No requirement
No requirement
No requirement
2+ -
]/ [HCO ] < 0,5
3
No requirement