Viessmann Vitovalor PT2 Installation And Service Instructions For Contractors page 63

Filling gas condensing module and heating...
!
Please note
Unsuitable fill water increases the level of
deposits and corrosion and may lead to appli-
ance damage.
■ Flush the heating system thoroughly before
filling.
Only use fill water of potable water quality.
■
Special antifreeze suitable for heating systems
■
can be added to the fill water. The antifreeze
manufacturer must verify its suitability.
■ Fill and top-up water with a water hardness in
excess of the following values must be soft-
ened, e.g. with a small softening system for
heating water.
Total permissible hardness of the fill and top-up water
Total heating output
kW
50
≤
50 to 200
> ≤
200 to 600
> ≤
600
>
D
B
A
C
Fig. 60
Heating return
A
Heating flow
B
Specific system volume
< 20 l/kW
3
3.0 mol/m (16.8 °dH)
≤
3
2.0 mol/m (11.2 °dH)
≤
1.5 mol/m 3 (8.4 °dH)
≤
< 0.02 mol/m 3 (0.11 °dH)
C
A
B
D
Commissioning, inspection, maintenance
(cont.)
20 l/kW to < 50 l/kW
≥
3
2.0 mol/m (11.2 °dH)
≤
3
1.5 mol/m (8.4 °dH)
≤
0.02 mol/m 3 (0.11 °dH)
≤
< 0.02 mol/m 3 (0.11 °dH)
50 l/kW
≥
3
< 0.02 mol/m (0.11 °dH)
3
< 0.02 mol/m (0.11 °dH)
< 0.02 mol/m 3 (0.11 °dH)
< 0.02 mol/m 3 (0.11 °dH)
63