Venting The Heating System - Viessmann VITODENS 222-F Installation And Service Instructions Manual

Venting the heating system

Fig. 27
1. Check whether the air vent screw in quick-action
air vent valve A of the heating circuit pump is
open.
2. Close the gas shut-off valve. Switch the appliance
on.
Activating the venting function
If the venting function is to be activated after commis-
sioning.
Tap the following buttons:
1. and OK – press simultaneously for approx. 4 s,
then release.
2. Use / to select "Basic settings".
3. OK
4. Use / to select "Commissioning assistant".
A
3. Activate venting function (see following steps).
4. Call up the pressure display with "System over-
view".
Check the system pressure.
5. OK
6.
appears.
7. OK
The venting function is activated. The display
shows the system pressure.
The venting function ends automatically after
20 min or when you tap OK.
Commissioning, inspection, maintenance
/ for "Next" and OK until "Venting"
33