13© by NECTA VENDING SOLUTIONS SpA 0301 162-00MAINTENANCEImportant notice!!Access to the machine interior for maintenance and/orrepairs is via the back panel.Therefore, provisions must be made for the machine to berotated, thus allowing removal of the back panel.The integrity of the vending machine and its conform-ity with the rules and regulations in force for itsrelevant systems must be checked by qualified per-sonnel at least once a year.Switch the machine off before any maintenance op-erations which require removal of components.The following operations must be carried out only bypersonnel who have the specific knowledge of themachine functioning from a point of view of electricalsafety and health regulations.INTRODUCTIONTo ensure perfect operation for a long period, the machinemust be subjected to regular maintenance.The following sections contain the procedures and themaintenance schedule, which are only a general indica-tion, as they greatly depend on the operating conditions(e.g. water hardness, environmental humidity and tem-perature, type of product used, etc.).The procedures described in this chapter are not exhaus-tive of all maintenance operations to be carried out.More complex operations (e.g. boiler descaling) should becarried out by qualified technicians only having specificknowledge of the machine.To prevent oxidation or the action of chemical agents, thestainless steel and varnished surfaces should be keptclean by using mild detergents (solvents must not beused).Never use water jets to clean the machine.BREWER UNIT MAINTENANCEEvery 10,000 selections or every 6 months some mainte-nance to the brewer unit must be carried out.Maintenance is carried out as follows:- remove the boiler teflon hose connection from the upperpiston, paying attention not to lose the seal (see Fig. 18);- undo the knob securing the unit to the bracket;- remove the brewer unit.Removing the upper filter- Take the snap ring out of its seat;- remove the piston from the crosspiece;- remove the filter and the piston seal.Removing the lower filter- Loosen screws A and B enough to release the coffeefunnel (see Fig. 18);- remove the lower piston snap ring;- take the piston out of brewing chamber and remove thefilter.Soak all components removed from the unit in a solution ofboiling hot water and coffee machine detergent for approx.20 minutes.Thoroughly rinse and dry all parts, then reinstall them in thereverse order of disassembly, taking particular care that:- the piston is positioned in the correct notch for the coffeedose used (see relevant section);- the two reference notches match and that the coffee unitis inserted.Important notice!!!Check that the handle pin of the ratiomotor is correctlyengaged in its seat.Fig. 191 - Coffee funnel2 - Boiler connecting hose3 - Unit securing knob4 - Upper piston snap ring5 - Lower piston snap ring6 - Reference notches7 - Ratiomotor handle pin