Figure 7-8.In-line toggle switch.
food preparation and allow more time for the food
preparer to accomplish other tasks.
Manual controls turn the heating unit on and off by
making or breaking the electrical circuit. Manual
controls consist of the toggle switch and different types
of rotary switches.
Toggle switches are used to make and break the
electrical circuit on many small appliances. Figure 7-8
shows one type of toggle switch that is installed in an
appliance cord. This type of switch cannot be repaired.
You must replace it. Figure 7-9 shows a typical wall-
mounted toggle switch used to control appliances. New
switches are usually so inexpensive that repairing an old
one is not economical.
Rotary switches have fast make-and-break action
and usually have three or more heat settings. The spring
Figure 7-9.Typical wall-mounted toggle switch.
Figure 7-10.Typical rotary switch.
action contained in this type of switch enables it to
operate extremely fast and eliminates the usual pitting
and burning of its contacts.
Rotary switches are normally used to control the top
elements of an electric range. Changing the position of
the switch changes the connection to the element and
varies the voltage; for example, the LOW position
connects the elements in series to a 120-volt Rower
source, and the HIGH position connects the elements in
parallel to a 240-volt power source. Various
combinations of these connections deliver different
heat from the unit, all controlled by the rotary switch.
Figure 7-10 shows a typical rotary switch.
Repair of this switch is recommended only as a
temporary measure. Repair consists of cleaning and
adjusting contacts, replacing worn and inoperative
parts, and lubricating the contacts and switch
mechanism with nonoxide grease for smoother
operation. The switch should be replaced as soon as a
replacement is available.
The pull-to-turn switch, as shown in figure 7-11, is
constructed to carry the higher loads connected with
Figure 7-11.Pull-to-turn switch.