Venting The Boiler By Flushing - Viessmann Vitodens 200-W Installation Instructions Manual

Commissioning, inspection, maintenance
Further details regarding the individual steps

Venting the boiler by flushing

B
32
1. Check the pre-charge pressure of the
diaphragm expansion vessel.
2. Close the gas shut-off valve.
3. Fill the heating system via boiler drain
& fill valve A. System pressure
> 1.0 bar (0.1 MPa).
4. Close boiler drain & fill valve A.
A
1. Close the shut-off valves on the heat-
ing water side.
2. Connect the drain hose to boiler drain
& fill valve B.
3. Open valves A and B. Vent under
mains pressure until no more air
noise can be heard.
4. Close taps A and B; open the shut-
A
off valves on the heating water side.
(cont.)