Water Quality Requirements - Viessmann VITOCROSSAL 200 Service Instructions Manual

Commissioning /service report

Water quality requirements

Note
Maintaining the following require-
ments 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 guide-
line 2035 sheet 1 "Prevention of heating system damage – scaling in DHW and
hot water heating 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 fol-
lowing:
& The volume of fill and top-up water
of the heating system during its ser-
vice life will not exceed three times
the water content of the heating sys-
tem.
& The specific system volume is less
than 20 l/kW output. In multi-boiler
systems, 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
3
mol/m
≤ 2.0
≤ 1.5
< 0.02
Soften the fill & top-up water in heat-
ing systems operating under the fol-
lowing conditions:
& The total of alkaline earths in the fill
& top-up water exceeds the stan-
dard value.
& Higher fill & top-up water volumes
are expected.
& The specific system volume is less
than 20 l/kW output. In multi-boiler
systems, apply the output of the
smallest boiler.
Total hardness
°dH
≤ 11.2
≤ 8.4
< 0.11