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 at boiler fill
& drain valve A in the heating
return (on the connection set or on
site). (Minimum system pressure
> 0.8 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 was already
switched ON before filling began:
Switch ON the control unit and acti-
vate the filling program via code
"2F:2".
5. Close boiler fill & drain valve A.
6. Close the shut-off valves on the
heating water side.
Note
To call up coding level 1 and for set-
ting the coding address, see page 53.
For function and details of the fill pro-
gram, see page 106.
Whilst the fill program is running, the
display shows "bF" (Vitotronic 100) or
"Befüllung" (filling) (Vitotronic 200).
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