Viessmann Vitoladens 300-W Installation And Service Instructions For Contractors page 24

Commissioning, inspection, maintenance
Filling the heating system
!
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
>
Fig. 16
1. Check the pre-charge pressure of the expansion
vessel.
2. Fill the heating system via boiler drain & fill valve
A in the heating return (at the connection set or
on site). Minimum system pressure 0.8 bar
(80 kPa).
Note
If the control unit was not switched on prior to filling
the system, then the servomotor of the diverter
valve will still be in its central position and the sys-
tem will be completely filled.
3. If the control unit was already on before filling:
Switch the control unit ON and activate the filling
function (see next chapter).
Checking the power supply
24
(cont.)
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)
A
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)
4. Close boiler drain & fill valve
5. Close the shut-off valves on the heating water side.
Activating the filling function
1. Press OK and simultaneously for approx. 4 s.
å
2. "Service functions"
3. "Filling"
4. End the filling function:
Press OK or .
ä
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)
.
A