8.10.1 General characteristics ...........................................................................................................75 8.10.2 Reversal of direction of rotation during washing......................................................................76 8.10.3 Electrical symbols ...................................................................................................................76 8.10.4 Circuit diagrams ......................................................................................................................76 8.10.5 Motor with speed variator........................................................................................................77 8.10.6 Checking for efficiency............................................................................................................77 8.11 Commutator motor ........................................................................................................................78 8.11.1 General characteristics ...........................................................................................................78 8.11.2 Operating principle..................................................................................................................78 8.11.3 Electrical symbols ...................................................................................................................80 8.11.4 Circuit diagram........................................................................................................................81 8.11.5 Checking for efficiency............................................................................................................81 8.12 AC/DC converter ...........................................................................................................................82 8.12.1 General characteristics ...........................................................................................................82 8.12.2 Electrical symbol .....................................................................................................................82 8.12.3 Circuit diagram........................................................................................................................82 8.13 Heating element ............................................................................................................................83 8.13.1 General characteristics ...........................................................................................................83 8.13.2 Electrical symbol .....................................................................................................................84 8.13.3 Checking for efficiency............................................................................................................84 8.14 Heat exchanger.............................................................................................................................85 8.14.1 General characteristics ..........................................................................................................85 8.14.2 Electrical symbol .....................................................................................................................85 8.14.3 Checking for efficiency............................................................................................................85 8.15 Drying heater (washer-dryers).......................................................................................................86 8.15.1 General characteristics ...........................................................................................................86 8.15.2 Electrical symbol .....................................................................................................................86 8.15.3 Checking for efficiency............................................................................................................86 8.16 Bi-metal thermostats .....................................................................................................................87 8.16.1 General characteristics ...........................................................................................................87 8.16.2 Operating principle..................................................................................................................87 8.16.3 Electrical symbols ...................................................................................................................87 8.16.4 Manual-reset thermostat .........................................................................................................87 8.16.5 Checking for efficiency............................................................................................................87 8.17 Adjustable thermostat....................................................................................................................88 8.17.1 General characteristics ...........................................................................................................88 8.17.2 Electrical symbol .....................................................................................................................88 8.17.3 Checking for efficiency............................................................................................................88 8.18 NTC temperature sensor...............................................................................................................89 8.18.1 General characteristics ...........................................................................................................89 8.18.2 Electrical symbol .....................................................................................................................89 8.18.3 Checking for efficiency............................................................................................................89 8.19 Drain pump....................................................................................................................................90 8.19.1 General characteristics ...........................................................................................................90 8.19.2 Electrical symbol .....................................................................................................................90 8.19.3 Checking for efficiency............................................................................................................90 8.20 Circulation pump ...........................................................................................................................91 8.20.1 General characteristics ...........................................................................................................91 8.20.2 Electrical symbol .....................................................................................................................91 8.20.3 Checking for efficiency............................................................................................................91 8.21 Drying timer (washer-dryers).........................................................................................................92 8.21.1 General characteristics ...........................................................................................................92 8.21.2 Circuit diagram........................................................................................................................92 8.21.3 Contact closure diagram .........................................................................................................92 8.21.4 Checking for efficiency............................................................................................................92 8.22 Fan motor (washer-dryers)............................................................................................................93 8.22.1 General characteristics ...........................................................................................................93 8.22.2 Electrical symbol .....................................................................................................................93 8.22.3 Checking for efficiency............................................................................................................93 8.23 Circuit diagrams ............................................................................................................................94 8.23.1 Wiring diagram........................................................................................................................94 8.23.2 Basic circuit diagram ...............................................................................................................96 9 ACCESS TO COMPONENTS...............................................................................................................97 9.1 Work-top ........................................................................................................................................97 9.1.1 Pressure switch.......................................................................................................................97 SOI/DT 2002-05 eb 4 599 35 23-17