Venting The Boiler; Venting The Heating System - Viessmann VITOLADENS 300-W Installation And Service Instructions Manual

Further details regarding the individual steps

Venting the boiler

B
A

Venting the heating system

1. Start the control unit.
2. Activate venting program (see follow-
ing steps).
Note
For function and sequence of the
venting program, see page 121.
3. Check the system pressure.
Commissioning, inspection, maintenance
(cont.)
1. Close the shut-off valves on the heat-
ing water side.
2. Connect the drain hose between top
tap B and a drain.
3. Open taps A and B and vent at
mains pressure, until no sound of
escaping air can be heard.
4. Close taps A and B; open the shut-
off valves on the heating water side.
Activating the venting program
1. Press OK and å simultaneously
for approx. 4 s.
2. "Service functions"
3. "Venting"
27