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Further details regarding the individual steps
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 mmol/l e.g. use a small
softening system for heating water (see Vitoset price list).
An antifreeze additive suitable for heating systems can be mixed with
the fill water.
1. Check the inlet pressure of the dia-
phragm expansion vessel.
2. Close the gas shut-off valve.
3. Fill the heating system at the fill
valve 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.
Commissioning, inspection, maintenance
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".
Note
To call up coding level 1 and for
setting the coding address, see
page 41.
For function and details of the fill
program, see page 100.
Whilst the fill program is running,
the display shows "bF"
(Vitotronic 100) or "Befüllung"
(filling) (Vitotronic 200).
5. Close the boiler fill & drain valve.
6. Set code "2F:0".
7
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