VITODENS 200 WB2A - Heatingspares247.com

9 Replacement of Parts9.23 Expansion VesselNOTE: There may be a small discharge of water hence precautions should be taken.e) If a rear flue is fitted it is necessary to temporarily disconnect the flue system.f) Unscrew the automatic air vent situated at the top of the boiler behind the flueconnector.g) Unscrew the eight screws securing the top rear cover and remove the cover.h) Lift out the expansion vessel. Replace and reassemble in reverse order. Checkthe expansion vessel pre-charge pressure.i) Connect the filling loop, open the CH flow and return valves and re-pressurisethe system to design pressure using the filling loop valves and venting asnecessary. Check all connections for soundness and then disconnect thefilling loop.j) Finally, ensure that the outer casing is secured in position warm up the systemand check for leaks and correct pressure readings.69