Venting The Boiler By Flushing - Viessmann VITODENS 100-W Installation And Service Instructions Manual

Commissioning, inspection, maintenance
Further details regarding the individual steps

Venting the boiler by flushing

Gas condensing boiler
A
32
C B
(cont.)
1. Connect the drain hose on shut-off
valve A to a drain.
2. Close shut-off valve B.
3. Open valves A and C and flush at
mains pressure, until no sound of
escaping air can be heard.
4. First close valve A and then valve
C.
5. Adjust the operating pressure
≥ 0.8 bar (80 kPa) with valve C.
6. Open shut-off valve B.
7. Disconnect drain hose and keep
safe.