VITODENS 200 WB2A - Heatingspares247.com

5 Commissioning and TestingBefore commissioning the appliance, the whole gas installation including the meter MUST bepurged and tested for gas soundness in accordance with BS 6891: 1988. IMPORTANT: Open alldoors and windows; extinguish naked lights and DO NOT SMOKE whilst purging the gas line.Before commencing the commissioning procedure, ensure that the gas service cock is turnedon, the electricity supply is isolated and that the DHW and CH pipework is complete.Fill the system with cold water. It may be convenient to carry out this procedure before fittingthe boiler to the piping frame. Vent the system via the radiator valves and system air vents inaccordance with normal practice, close all air vents and check for system soundness.Drain the entire system to flush out any debris.The following instructions assume that the casing has not yet been fitted following initialinstallation. If the casing has been fitted, it is necessary to remove the casing as described insection 6.1 (a)5.1 Filling the Central Heating CircuitThe following procedure is recommended when the boiler has been fitted.a) Check that the central heating flow and return valves are open. Turn on themains water supply.b) Open the filling loop valves and fill the system via the boiler fill and drain valve(A). Check the system pressure on the gauge and vent all radiators and airvents in the normal way. Close the filling loop valves before the systempressure reaches 2.5 bar.c) Unscrew the pump spindle cover (in the centre of the pump head) and spin thepump shaft with a screwdriver to ensure that it routes freely. Replace thespindle cover.d) Check the operation of the pressure relief valve by rotating the plastic headanticlockwise 1/4 of a turn and checking that water is discharged. Ensure thatthe valve seats correctly and does not leak. If the valve leaks or is stuckclosed, replace it.e) Check the system for water leaks; the system should then be flushed inaccordance with BS 7593. Upon completion of correct flushing, the systemshould be re-filled to 0.2 bar above system design pressure. System designpressure should be between 1.0 and 1.5 bar.36