Viessmann VITORONDENS 200-T Service Instructions Manual page 10

Commissioning, inspection, maintenance
Filling the heating system
Fill water
According to EN 1717 with DIN 1988-100, as a heat
transfer medium for DHW heating, the heating water
must meet fluid category ≤ 3. This requirement is met if
water of potable quality is used as heating water. For
example, if additives are used, the additive manufac-
turer must specify which category the treated heating
water comes under.
Total permissible hardness of the fill and top-up water
Total heating output
kW
50
≤
50 to 200
> ≤
200 to 600
> ≤
600
>
With on-site boiler fill valve in the heating water return
A B
Fig. 1
A Bypass valve "OPEN"
Bypass valve "CLOSED"
B
10
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)
≤
3
< 0.02 mol/m (0.11 °dH)
!
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.
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)
≤
3
< 0.02 mol/m (0.11 °dH)
1. Check the pre-charge pressure of the expansion
vessel.
2. Close the bypass valve on the boiler flow/return
distributor.
3. If using a top-mounted Divicon heating circuit dis-
tributor (accessories):
Set the mixer lever to "OPEN" (red).
4. Fill the system via the boiler fill valve in the heating
water return, until it is fully vented.
5. Open the bypass valve on the boiler flow/return
distributor again.
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)
3
< 0.02 mol/m (0.11 °dH)