Solarbayer FRIWA 30, Product Information

Page: 24 / 36

Art.-Nr. 908.30.62.00
Stand 11/2015
- 24 -
3.3 Pressure loss/pump characteristic curve
Tuxhorn - KRce 21.10.2015 Druckverlust
0
0,1
0,2
0,3
0,4
0,5
0,6
0,7
0,8
0,9
0
1
2
3
4
5
6
7
8
9
10
0 0,2 0,4 0,6 0,8 1 1,2 1,4 1,6 1,8 2
[b
a
r]
[m
]
[m
³/h]
Wilo Yonos
Para 15/7.0
FRIWA 30
tube 50 mbar
at Vmax
FRIWA 30
at Vmax
3.4 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]
Copper-soldered Solid stainless steel
Chloride
1
(CL
-
) < 300 mg/l at 60°C
< 100 mg/l at 80°C < 300 mg/l at 60°C
< 100 mg/l at 80°C
Sulphate
1
(SO
4
2-
) < 70 mg/l < 100 mg/l
Nitrate (NO
3
-) < 50 mg/l
pH value 7.5 - 9.0 7.0 - 9.0
Electrical conductivity* (at 25°C) 10
– 500 µS/cm
Hydrogen carbonate (HCO
3
-
) 70 -300 mg/l 60 -300 mg/l
Ratio HCO
3
-
/SO
4
2-
Ratio > 1.0 Ratio > 1.5
Ammonia (NH
4
+
) < 2 mg/l
Free chlorine gas < 1 mg/l
Sulphite < 1 mg/l
Hydrogen sulphide (H
2
S) < 0.05 mg/l
Free (aggressive) carbon dioxide
(CO
2
)
< 5 mg/l
Iron (Fe) < 0.2 mg/l
Aluminium (Al) < 0.2 mg/l
Manganese (Mn) < 0.1 mg/l
Degree of hardness >4.0° dH
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, e.g.
FRIWA 50 VA with solid stainless steel plate heat exchanger.