Filling And Venting The Heating System; Further Details Regarding The Individual Steps - Viessmann Vitopend 100-W Installation And Service Instructions Manual

Commissioning, inspection, maintenance

Further details regarding the individual steps

Filling and venting 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
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. The antifreeze manufacturer must verify its suitability, since oth-
erwise damage to gaskets and diaphragms can occur as well as noise dur-
ing heating operation. Viessmann accepts no liability for damage or conse-
quential damage as a result.
1. Check the pre-charge pressure of the
diaphragm expansion vessel.
2. Close the gas shut-off valve.
3. Fill the heating system at the fill valve
in the heating return (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 central
position, and the system will be com-
pletely filled.
14
4. If the control unit had already been
switched ON before filling began:
■ Turn both rotary selectors simulta-
neously anticlockwise to the end
stop.
■ Switch OFF the ON/OFF switch on
the control unit and switch ON
again after 3 s.
3
2
1
3
2
1
3
), e.g. using
4
5
6
3s
4
5
6