Austria
Germany
Switzerland
pH value
6.0 – 8.5
6.5 – 8.5
6.0 – 8.5
Chloride
< 30 mg/L
< 30 mg/L
< 30 mg/L
Additional requirements for Switzerland:
The filling and make-up water must be demineralised (fully purified)
▪ The water must not contain any ingredients that could settle and accumulate in the
system
▪ This makes the water non-electroconductive, which prevents corrosion
▪ It also removes all the neutral salts such as chloride, sulphate and nitrate which can
weaken corrosive materials in certain conditions
If some of the system water is lost, e.g. during repairs, the make-up water must also be
demineralised. It is not enough to soften the water. The heating system must be
professionally cleaned and rinsed before filling the units.
Inspection:
▪ After eight weeks, the pH value of the water must be between 8.2 and 10.0. If the central
heating water comes into contact with aluminium, the pH value must be between 8.0 and
8.5
▪ Yearly. Values must be recorded by the owner
2
Safety
Design Information
10
Froeling GesmbH | A-4710 Grieskirchen, Industriestraße 12 | www.froeling.at
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