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MAINTENANCE Ash removal from fire chamber Ash removal from convection part Check the ash compartments of the convection part once a month and remove the ash with the ash rake if required. The cleaning interval of the ash compartment of the convection part depends on the fuel used and the power needed. If the boiler is equipped with an ash screw the maintenance interval lengthens. Check the fire chamber ash compartment1-2 times a month and remove the ash with an ash rake if required. The cleaning interval of the ash compartment depends on the fuel used and the power needed. If the boiler is equipped with an ash screw the maintenance interval lengthens. However, from time to time the ash from the sides of the ash compartment should be removed. Sweeping the fire chamber Clean fire chamber surfaces at least once a year. Use bent brush arm and round brush. 19