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1001 8.0 COMMISSIONING AND TESTING 8.1 Filling the Central Heating System Burner pressure test point Automatic air vent Vent cap Heat exchanger vent Pump C.H. pressure relief valveGas inlet pressure C.H. pressure gauge test point D.H.W. drain point Low water pressure switch Fig. 20 Remove the top front panel by gripping both sides and lifting forward away from main boiler assembly. Loosen the cap of the automatic air vent (fig. 20) and leave it loose. Open the central heating flow and return coc