
7
Filling the heating system
!
Please note
Unsuitable fill water increases the level of deposits and corrosion and may
lead to boiler damage.
■ Thoroughly flush the entire heating system prior to filling it with water.
■ Only use fill water of potable quality.
■ Soften fill water with hardness exceeding 16.8 °dH (3.0 mol/m
3
), e.g. using
a small softening system for heating water (see Viessmann Vitoset price
list).
■ An antifreeze additive suitable for heating systems can be mixed with the
fill water. The antifreeze manufacturer must verify its suitability.
1.
Check the pre-charge pressure of the
diaphragm expansion vessel.
2.
Remove front insulation shell
A
.
3.
Open air vent valve
B
.
4.
Fill the heating system at the fill
valve
C
in the heating return. (Mini-
mum system pressure 0.8 bar.)
5.
Close air vent valve
B
when no
more air is being expelled.
6.
Close boiler fill valve
C
.
Commissioning, inspection, maintenance
Further details regarding the individual steps
5692 774 GB
Содержание Vitoladens 300-C
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