SERVICE'MANUAL'–'Coffee'Machine'mod.'2998100'-'2998600'
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Page'4'of'18'
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HYDRAULIC&SCHEME&
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The'circuits'for'hot'water,'steam'and'coffee'are'fed'by'the'same'vibration'pump;'therefore,'their'supply'
happens'separately.''
Hereafter'is'a'short'description'of'the'operating'sequences'concerning'the'four'main'functions:''
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Coffee&supply:&
By' pushing' the' coffee' button,' the' cycle' of' supply' is' initiated' with' the' start' of' the' pump' P1' and' two'
electro-valves' EV2' –' EV4.' The' electro-valve' EV2' is' connected' to' the' hydraulic' piston' which' reaches'
operating'pressure'by'closing'the'infusion'chamber'on'the'drawer'filter.'At'the'same'time,'the'electro-
valve' EV4' is' opened' and' allows' passage' of' pressured' water' through' the' non-return' valve' VR1,' set' to'
open' at' the' optimal' supply' pressure.' Water' passes' through' the' coffee' exchanger' and' flows' in' the'
infusion'chamber'at'the'operating'temperature'only'if'the'mechanical'sensor'of'pod'presence'is'open,'
that'is'if'the'pod'is'present'on'the'filter.'To'stop'the'supply,'press'the'coffee'button'again.'The'pump'P1'
is'stopped'at'the'same'time'as'the'electro-valve'EV2,'while'the'electro-valve'EV4'enables'the'drainage'
of'water'in'the'drop-receptacle'basin'through'the'silicone'pipe.''
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Hot&water&supply'
When' pressing' the' hot' water' button,' the' pump' P1' and' the' electro-valves' EV1' and' EV4' are' activated.'
Water'flows'through'the'two'electro-valves'and'is'heated'by'the'coffee'exchanger,'then'flows'through'
the' moveable' supply' pipe.' When' the' required' quantity' is' reached,' to' stop' the' supply' press' the' hot'
water' button' again.' The' pump' and' the' two' electro-valves' are' stopped' and' the' water' in' excess' still'
present'in'the'coffee'exchanger'flows'back'through'EV4'and'back'in'the'drop-receptacle'basin'through'
the'silicone'pipe.'
