Venting The Boiler - Viessmann Vitoplus 300 Service Instructions Manual

Initial start-up, inspection, maintenance
Further details regarding the individual steps

Venting the boiler

8
(cont.)
4. Continue to fill the system.
5. Close boiler fill & drain valve A.
1. Close the shut-off valves on the
heating water side.
2. Connect the drain hose between
top valve B and a drain outlet.
3. Open valves A and B, and vent
at mains pressure until no sound of
escaping air can be heard.
4. Close valves A and B and open
the primary shut-off valves.