La San Marco 20/20 CLASSIC Series, Use And Maintenance

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2.3 Water system diagram key:
1) Water softener
2) Water softener outlet valve
3) Water softener inlet valve
4) Connection of water softener supply
5) Electric motor pump
6) Pressure gauge (pump pressure)
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8) Autolevel valve
9) Filter
10) Automatic level solenoid valve
11) Autolevel valve
12) Boiler water manual filling valve
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14) Boiler hot water and steam drain valve
15) Flow meter manifold valve
16) Flow meters
17) Flow meter valve
18) Hot water and steam boiler heating element
19) Hot water and steam boiler
20) Heat exchanger
21) Hot water and steam boiler safety thermostat
22) Pressure switch
23) Steam valve
24) -
25) Hot water valve
26) Pressure gauge (boiler hot water and steam pressure)
27) Vacuum valve
28) -
29) Level probe
30) Boiler safety valve
31) Electronic control unit
32) Electronic level / keypad
33) Brewing group temperature regulation
34) -
35) Coffee brewing group
36) Portafilter
37) Coffee brewing group solenoid
38) Cup support tray and grate
39) Drain tray
40) Drain tube