Convection Cooking System; Heatingelement; Upper And Lower Latch Switches - Sharp R-8320E Service Manual

CONVECTION COOKING SYSTEM

This oven is designed with a hot air heating system where
food is not directly heated up by the heating element, but
is instead heated by forced circulation of the hot air pro-
duced by the heating element.
The air heated by the heating element is circulated through
the convection passage provided on the outer casing of
the oven cavity by means of the convection fan which is
driven by the convection motor. It then enters the inside
of oven through the vent holes provided on the top and
left side of the oven. Next, the hot air heats up the food
on the turntable and leaves the oven cavity through the
vent in the center of the oven cavity ceiling.
Without leaving the oven, this hot air is reheated by the
heating element, passes through the convection passage
and enters the inside of the oven cavity again, in a con-
tinuing cycle.
In this way, the hot air circulates inside the oven cavity to
raise its temperature and, at the same time, comes into
contact with the food being cooked.
When the temperature inside the oven cavity then drops
preset temperature, the heating element is de-energized.
When the temperature inside the oven cavity then drops
below the preset temperature, the heating element is
energized again. In this way, the inside of the oven cavity
is maintained at approximately the preset temperature.
When the convection time reaches 0, the heating element
is de-energized and the convection fan stops operating.
Although the damper will open and the cooling fan motor
normally turn off when the convection time reaches "0",
if the temperature of oven has reached approximately
motor will continue to operate, cooling the oven..
Pushing in ambient air through the vent holes in the damper
section, the cooling fan motor circulates it through the
oven and then exhausts it out through the rear vent and
condensate compartment. Once the oven temperature has
been lowered to a approximately 80°C, the cooling fan
motor stops operating.
Convection
Heating
Fan
Element
\ \ 7
Convect
Passage
Figure 8.
HEATING ELEMENT
The heating element is located above the top of the oven
cavity as illustrated in Figure 8. It is intended to heat air
driven by the convection fan. The heated air is kept in the
oven and forcedly circulated and reheated by the heating
element.

UPPER AND LOWER LATCH SWITCHES

The upper latch switch is mounted in the upper latch hook
and the lower latch switch is mounted in the lower latch
hook. They are activated by the latch heads on the door.
When the door is opened, the switches interrupt the circuit
to all components except the oven lamps and cooling fan
motor.
A cook cycle cannot take place until the door is firmly
closed thereby activating both latch switches.
Convection
Fan
Convection
Motor
Note: The monitor switch is provided on Australia Model.
Figure 9. Latch Switches and Monitor Switch
45
Latch
Latch
Hook
iitor
tch
I
Lower
Latch
Latch
Head
Latch
Switch
.