Viessmann VITODENS 111-W Installation And Service Instructions Manual page 23

Further details regarding the individual steps
A C
B
Commissioning, inspection, maintenance
C
4. Open shut-off valves A and B.
5. Open taps C and fill the heating sys-
tem. (Minimum system pressure
> 0.8 bar).
6. Close taps C.
(cont.)
23