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18
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On installation and during additions or changes at a later stage, A.O.Smith recom-
mends to keep a record of the type of water used, its quality at the time, and if ap-
plicable, which additives and quantities were added.
Parameter
Water type
pH
Conductivity (at 20°C in µS/cm)
Iron (ppm)
Hardness (°dH):
Installation volume/capacity
Installation volume/capacity
Oxygen
Corrosion inhibitors
pH increasing or lowering agents
Anti-freeze additives
Other chemical additives
Solid substances
Residues of processing water not for-
ming part of the drinking water
Water type definition:
Potable water:
Tap water compliant with the European drinking water guideline:
98/83/EG dated 3 November 1998.
Softened water:
Water with partly de-ionised calcium and magnesium.
Demi-water:
Virtually completely demineralised water (very low conductivity)
Distilled water:
Water no longer containing minerals.
Value
Potable water
Softened water
6.0-8.5
Max. 2500
Max. 0.2
1-12
<20 l/kW
1-7
>=20 l/kW
No oxygen diffusion allowed during
operation.
Max. 5% filling water addition annually
Refer to Additives Attachment
Refer to Additives Attachment
Refer to Additives Attachment
Refer to Additives Attachment
Not allowed
Not allowed
table 6.3.a
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