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 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 inlet pressure of the dia-
phragm expansion vessel.
2.
Close the gas shut-off valve.
3.
Fill the heating system via the boil-
er fill & drain valve
A
in the heat-
ing return (at the connection set or
on site). (Minimum system pres-
sure > 1.0 bar).
Note
If the control unit has not been
switched ON prior to filling the sys-
tem, then the servomotor of the
diverter valve will still be in its cen-
tral position, and the system will be
completely filled.
4.
If the control unit had already been
switched ON before filling began:
Switch ON the control unit and acti-
vate the fill program via coding
address "2F:2".
5.
Close boiler fill & drain valve
A
.
6.
Close the shut-off valves on the
heating water side.
Further details regarding the individual steps
7
Commissioning, inspection, maintenance
5692
673
GB
Summary of Contents for VITODENS 300-W
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