249. MAINTENANCE9.1 GeneralThe heat generator must be submitted to regular maintenance to guarantee the efficiency of allthe components determining the correct operating of the generator and its main yield. Tab.9.1summarises the main operations.ATTENTION !!BEFORE PERFORMING MAINTENANCE OPERATIONS , DISCONNECT THE POW-ER SUPPLY FROM THE GENERATOR BY INTERVENING ON THE MAIN SWITCHAND ENSURE THAT THE RESIDUAL FUEL INSIDE THE FIREBOX IS OFF ANDHAS COOLED DOWNATTENTION!!MAINTENANCE MUST BE CARRIED OUT ONLY BY QUALIFIED STAFFOPERATION OBJECT OF THECHECK PERIODICITY ACTIONS TO TAKE REFERENCECHECK COMBURENT AIRFANBEGINNING SEA-SONcheck that the fan turns and do not causevibrations, in case remove the excess dustand dirt.Pos.16 - fig.3.4.2LUBRICA-TIONAIR VENTILATIONPIPES BLADESBEGINNING SEA-SON OR AFTER ALONG INACTIVITYPERIODLubricate the rotary transversal pin of theinternal blade of the comburent air pipeusing spary oil or a brush-tab.9.1