Venting The Boiler By Flushing - Viessmann VITODENS 111-W Installation And Service Instructions Manual

Further details regarding the individual steps

Venting the boiler by flushing

B
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.
Commissioning, inspection, maintenance
A
A
4. Close taps A and B; open the shut-
off valves on the heating water side.
5. Remove the line between taps A
and keep safe. This will be required
for topping up.
(cont.)
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