BI Comb SGM.GB

4.2.6 ASH DISCHARGE SCREW WITH ITS MOTOR AND DRIVE MECHANISMSFig. 81 ASH DISCHARGE SCREW2 MALE-FEMALE SQUARE TRANSMISSION JOINT3 THRUST BEARING4 INTERMEDIATE FLANGE5 GEAR MOTOR6 DISCHARGE OUTLET DAMPER7 FLAP8 SERVO CONTROL WITH SPRING RETURN9 DISCHARGE FLANGEThe operation of the screw is automatic. After a certainnumber of boiler operating hours (set according to the typeof material and the output of the boiler), the electrical panelshuts-down the combustion process, and, in sequence,opens the outlet damper and sets the discharge screw andany ash removal mechanisms in motion, upon receiving theelectrical signal. For the operating logic, see the wiring diagram.The duration of the individual movements is controlledby timers. The calibration of these systems during theinitial commissioning phase must also be carried out by theFERROLI TECHNICIANS responsible for testing andinspection. The screw can be removed forinspection/overhaul from either side, depending on thespace available; remove the gear motor unit from one side,or the ash dump outlet damper on the other side.N.B. - When removing the screw, check:- The degree of wear on the screw worm- That the screw axis is straight- That there is suitable play in the coupling of the malefemalesquare and its degree of wear.13