Viessmann Vitoladens 300-W Installation And Service Instructions For Contractors page 23

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 .
C
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