Electrical Projects Another type of hair dryer is a portable. This type delivers cool or warm air from a motor unit through a flexible hose into a plastic cap worn on the head. Unlike the salon dryer, it does not provide steam or mist; so has only a motor and a heating element.

With the unit plugged into a 120V outlet, and the switch turned to the soft-dry position, only the motor circuit is energized. With the switch in the low position, one element of the heater is energized plus the motor circuit. In the medium position, the other element of the heater is energized plus the motor circuit. And in the speed dry position, both elements of the heater are energized plus the motor circuit. The thermostat is in series with the heater; therefore, if an overheat condition exists, the heater is cut out of the circuit. A fuse on the heater is also provided to burn out if an overheat condition exists.


Troubleshooting

We can think of this appliance as having two major systems. The heater element and the thermostat make up one, and the motor and impeller comprise the other. The line cord and the switch are common to both.




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Febuaury 10, 2012