1.3.3 Requirements for central heating water
Water quality
Water of the following quality is required for the first fill:
▪ The water must be clean, pure or purified as well as odorless and must not contain
suspended matter.
▪ The water hardness must not exceed 190 grain/fl.oz. or 100 ppm CaCO
3
(100 mg/L), i.e. soft water is required.
▪ The chlorine concentration in the water must not exceed 58 grain/fl.oz. (30 mg/L).
▪ The pH value in the heating system must be between 8.0 and 8.6.
▪ If the water quality is too poor, use additives to prepare the water. If you are
topping up with small amounts, always use clean water.
NOTICE
The hot water must not be used directly in swimming pools or thermae. Use a
heat consumer of the right size to consume the heat. Do not use the heating
water as drinking water.
To ensure good water quality during operation, avoid leaks and use a closed heating
system. If necessary, use a return temperature control.
First fill
To prevent air from getting into the heating system during the first fill, fill the filling
hose with water.
Frost protection
You can add anti-freeze to the heating water, however, this can reduce the heating
efficiency. Always follow the manufacturer’s dosing instructions when using anti-
freeze, as using the incorrect amount can cause corrosion. Check the concentration of
the anti-freeze at regular intervals.
Safety
1
Requirements at the place of installation
Montageanleitung S3 Turbo | M1870119_en-us 9
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