Further Details Regarding The Individual Steps; Filling The Heating System - Viessmann Vitodens 333 Service Instructions Manual

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 with water.
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Only use fill water of potable quality.
&
Fill water with a water hardness in excess of 3.58 mmol/l must be sof-
tened, e.g. with the small softening system for heating water (see the
Vitoset pricelist).
&
An anti-freeze 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
changeover valve will still be in its
centre position, and the system will
be completely filled.
Initial start-up, inspection, maintenance
4. If the control unit had already been
switched ON before filling began:
Start the control unit and activate
the fill program via coding "2F:2".
Note
To call up coding level 1 and for
setting the coding address, see
page 39.
For function and details of the fill
program, see page 100.
Whilst the fill program runs, the dis-
play shows "bF" (Vitotronic 100) or
"Filling" (Vitotronic 200).
5. Close the boiler fill & drain valve.
6. Set code "2F:0".
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