Viessmann Vitoladens 300-W Installation And Service Instructions Manual page 21

Removing the front panel
A
Fig. 15
1. Remove front panel
A
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.
C
. To do so, undo screws
B
Commissioning, inspection, maintenance
B
. 2. If necessary, remove cover panel
!
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.
.
C
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