7.7.2008 Rev. 3.0
Installation
11
5.5.1 Requirements for water quality
A general assumption is that the appliance material is defective when hard-to-clean de-
posits or corrosion appear on the surface. Usually this is, however, due to the aggressive
nature of water and harmful components it contains as well as to neglicence of cleaning
the appliance.
Quality criteria, both national and based on EU directives, exist for tap water. E.g. calcium
and magnesium that cause water hardness are useful substances for health, but in appli-
ances they cause harmful scale. Chlorides, on the other hand, provide a favourable soil for
corrosion even in small contents when combined with a humid and warm environment.
The smaller chloride content, the better is the situation. In order to guarantee a long serv-
ice life for an appliance we recommend the following limit values for water quality.
Various kinds of filters and water softeners can be used if water quality deviates from nor-
mal.
If you use water softeners, remember to take care of appropriate maintenance and service
of the water softener as well as the appliance itself.
Chloride content (Cl¯ ) < 25 mg/l
Conductibility < 40mS/m
pH 7-8,8
Hardness 2-5°dH = 0,4 - 0,7 - 0,9 mmol/l
Particle filter, 5 µm water contains sludge and other impurities
Reverse osmosis Cl¯ ≥ 25 mg/l, softening of water, elimination of salts, does
not remove chlorides completely
H± ion exchanger Cl¯ ≥ 25 mg/l, softening of water, elimination of salts, pro-
duces completely chloride-free water
Na ion exchanger Cl¯ < 25 mg/l, softening of water, does not remove chlo-
rides from water
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