33
Total permissible hardness of the fill and top-up water
Total heating output
Specific system volume
kW
< 20 l/kW
≥
20 l/kW to < 50 l/kW
≥
50 l/kW
≤
50
≤
3.0 mol/m
3
(16.8 °dH)
≤
2.0 mol/m
3
(11.2 °dH)
< 0.02 mol/m
3
(0.11 °dH)
>
50 to
≤
200
≤
2.0 mol/m
3
(11.2 °dH)
≤
1.5 mol/m
3
(8.4 °dH)
< 0.02 mol/m
3
(0.11 °dH)
>
200 to
≤
600
≤
1.5 mol/m
3
(8.4 °dH)
≤
0.02 mol/m
3
(0.11 °dH)
< 0.02 mol/m
3
(0.11 °dH)
>
600
< 0.02 mol/m
3
(0.11 °dH)
< 0.02 mol/m
3
(0.11 °dH)
< 0.02 mol/m
3
(0.11 °dH)
Fig. 28
1.
Check the pre-charge pressure of the expansion
vessel.
2.
Remove front insulation shell
A
.
3.
Open air vent valve
B
.
4.
Fill the heating system at boiler fill valve
C
in the
heating return.
Minimum system pressure 0.8 bar (80 kPa).
Permissible operating pressure 3 bar (300 kPa).
Note
According to EN 12828, every heat generator in a
heating system must be protected against exceed-
ing the maximum operating pressure by at least
one safety valve.
5.
Close air vent valve
B
when no more air escapes.
6.
Close boiler fill valve
C
.
Checking all connections on the heating water side for leaks
Commissioning, inspection, maintenance
Filling the heating system
(cont.)
6136330
