Rittal SK 3209. Series, Assembly And Operating Instructions Manual

Page: 32 / 37

32 Rittal air/water heat exchanger assembly instructions
11 Further technical information
EN
11 Further technical information
11.1 Hydrological data
To avoid system damage and to ensure safe opera-
tion, Rittal GmbH & Co. KG recommends the use of
system water or an additive whose composition does
not differ from that presented in the following sum-
mary:
Tab. 7: Hydrological data
Hydrological data Unit Model No. SK Model No. SK
1)
–
3209.100/3209.110/3209.140
3209.500/3209.510/3209.540
3210.100/3210.110/3210.140
3210.500/3210.510/3210.540 3209.104/3209.114/3209.144
3209.504/3209.514/3209.544
3210.104/3210.114/3210.144
3210.504/3210.514/3210.544
pH value 7 – 8.5 6 – 9
Calcium hardness °dH 3 < 8 1 – 2
Free carbonic acid mg/dm
3
8 – 15 1 – 100
Corresponding carbonic acid mg/dm
3
8 – 15 Zero
Aggressive carbonic acid mg/dm
3
0 0 – 400
Sulphides mg/dm
3
Zero Zero
Oxygen mg/dm
3
< 10 < 10
Chloride ions mg/dm
3
< 50 < 200
Sulphate ions mg/dm
3
< 250 < 500
Nitrates and nitrites mg/dm
3
< 10 < 100
COD mg/dm
3
< 7 < 40
Ammonia mg/dm
3
< 5 < 20
Iron mg/dm
3
< 0.2 Zero
Manganese mg/dm
3
< 0.2 Zero
Conductivity µS/cm < 2200 < 4000
Evaporation residue mg/dm
3
< 500 < 2000
Potassium permanganate mg/dm
3
< 25 < 40
Suspended matter mg/dm
3
< 3
> 3 < 15: partial current purification recommended
> 15: continuous purification recommended
1)
The complete absence of corrosion under experimental conditions suggests that solutions with a significantly higher salt content
and greater corrosion potential (such as seawater) can still be tolerated.