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

Further details regarding the individual steps

Venting the boiler

A
B
Commissioning, inspection, maintenance
1. Close the shut-off valves on the heat-
C
ing water side.
2. Remove cover panel A.
3. Push the drain hose onto air vent
valve B and connect to a drain.
4. Open air vent valve B and fill valve
C in the heating return and vent
using mains pressure (flush) until no
more air noise can be heard.
5. First close air vent valve B.
6. When the required operating pres-
sure has built up, close fill valve C.
Open the shut-off valves on the heat-
ing water side.
7. Remove drain hose from air vent
valve B and retain.
(cont.)
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