ELECTRICAL OPERATION.Lets look at the
electrical operation of a washer. With the plug
connected to the outlet, the timer is turned to WASH and
the dial is pushed in or pulled out, depending on the type
of switch. The operational cycle continues as follows:
1. From the ON/OFF switch, power flows through
the temperature control switch and the water-level
switch to the inlet solenoid valve. That energizes the
inlet valve, allowing the tub to fill.
2. The timer motor is de-energized during the fill
cycle because of the open set of contacts in the water-
level control switch.
3. Once the water reaches the proper level, one set
of contacts opens to shut off the fill solenoid. The other
contacts close, sending power to the timer and, at the
same time, energizing the motor for the wash cycle.
4. At the end of the wash cycle, power is fed from
the timer to the solenoid on the pump, engaging the
pump and removing water from the tub.
5. Once the tub is empty, the solenoid for the spin
cycle is energized. Its power is fed through the door
switch to the solenoid so that, if the door is opened, the
machine shuts down
6. During the spin cycle, the water pump is
running, and the tub is operating at high speed The
timer has provided a bypass circuit around the now open
set of contacts in the water-level control switch
7. Once the cycle is completed, the pump, the
high-speed solenoid, and the motor are de-energized
because there is no water in the tub.
8. The water-level switch closes, energizing the
inlet water solenoid to fill the tub for the rinse cycle.
Figure 7-3.Typical wiring diagram of a washing machine.