Venting The Heating System - Viessmann Vitodens 222-F B2TA Installation And Service Instructions Manual

Commissioning, inspection, maintenance
Further details regarding the individual steps

Venting the heating system

1. Close the gas shut-off valve and
switch the control unit ON.
2. Check whether the air vent screw in
quick-action air vent valve A in the
heating circuit pump is open.
3. Activate venting program (see follow-
ing steps).
Note
For function and sequence of the
venting program, see page 160.
40
(cont.)
A
4. Check the system pressure.
5. Open the gas shut-off valve.