Water Quality Requirements - Viessmann VITOCROSSAL 200 Instructions Manual

Water quality requirements

Note
Maintaining the following requirements
is necessary to safeguard your warranty
rights.
The manufacturer's warranty excludes
damage due to corrosion and scaling.
Prevention of damage due to scaling
Prevent excessive scale build-up (calcium carbonate) on the heating surfaces. For
heating systems with operating temperatures up to 100 °C, the VDI guideline 2035
sheet 1 "Prevention of heating system damage – scaling in DHW and hot water heat-
ing systems" applies [in Germany] together with the following standard values (see
also the full explanations in the original guideline).
Total output
kW
> 50 to ≤ 200
> 200 to ≤ 600
> 600
The standard values assume the follow-
ing:
■ The volume of fill and top-up water of
the heating system during its service
life will not exceed three times the
water content of the heating system.
■ The specific system volume is less
than 20 l/kW output. In multi-boiler sys-
tems, apply the output of the smallest
boiler.
■ All measures to prevent corrosion on
the water side in accordance with VDI
2035 Sheet 2 have been implemented.
62
Total of alkaline earths
mol/m 3
≤ 2.0
≤ 1.5
< 0.02
Total hardness
°dH
≤ 11.2
≤ 8.4
< 0.11
Soften the fill & top-up water in heating
systems operating under the following
conditions:
■ The total of alkaline earths in the fill &
top-up water exceeds the standard
value.
■ Higher fill & top-up water volumes are
expected.
■ The specific system volume is more
than 20 l/kW output. In multi-boiler sys-
tems, apply the output of the smallest
boiler.