VITODENS 200 WB2A - Heatingspares247.com

9 Replacement of Parts9.21 Pressure Gaugea) Gain access by following step 9.1(b).b) Isolate the central circuit by closing the flow and return valves. Drain theappliance using the drain point situated underneath the appliance at the bottomright hand side.c) Slide out the clip securing the pressure gauge connecter to the casing abovethe flow connection and pull out the connector.NOTE: There may be a small discharge of water hence precautions should be taken.d) Release the seven plastic tabs securing the lid of the control pod and lift offthe lid.e) Push down gently and rotate in an anticlockwise direction the plastic clipsecuring the back of the pressure gauge head and lift out the head.f) Carefully cut the cable ties securing the pressure gauge connecting tube to thewire bundles and remove the gauge completely.g) Replace the pressure gauge and reassemble in reverse order re-attaching thepressure tube to the wire bundles using suitable cable ties.h) 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.i) Finally, ensure that the outer casing is secured in position warm up the systemand check for correct pressure readings.67