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Operation
DAMPER OPEN-CLOSE MECHANISM
Usually, the damper is in the open position except during
convection cooking. Damper position is set automatically
by damper motor, damper switch, motor cam and damper
shaft. These components are operated by a signal that
judges if microwave cooking or convection cooking
operation is selected by the control unit.
Microwave Cooking:
Damper is in the open position, because a portion of
cooling air is channelled through the cavity to remove
steam and vapors given off from the heating foods.
It is then exhausted at the top of the oven cavity into a
condensation compartment.
Convection Cooking:
Damper is in the closed position, so that no hot air will be
allowed to leak out the oven cavity.
Damper Operation
1.
When power supply cord is plugged in:
a.
When power supply cord is plugged in, a signal is
sensed in the control unit, and operates shut-off
relay (RY4).
b.
Contacts of shut-off relay (RY4) close, the damper
motor is energized, opening the damper door.
c.
When the damper is moved to the open position by
the damper cam the damper switch is closed (ON
position).
d.
The signal from damper switch is re-sensed in the
control unit and shut-off relay (RY4) is turned off.
e.
The 120 volts A.C. to the damper motor is removed
and the motor turns off.
2.
When oven is microwave cooking:
Damper is in the open position.
3.
When oven is convection cooking:
a.
Damper motor is energized by touching the
convection, temperature and START pads.
b.
When damper is in the closed position (damper
switch is OFF), its signal is sensed by the control
unit, and shut-off relay (RY4) is de-energized.
c.
The damper is held in the closed position during the
convection cooking operation.
d.
At the end of the convection cooking, shut-off relay
(RY4) is energized, and the damper is returned to
the open position.
Damper Shaft
Figure 2-6. Damper Mechanism
If damper door is not in the proper position, closed
during convection or open during microwave, the
control unit will stop oven operation after 1 minute.
2-10
Damper Duct
Damper
Damper Cam
Damper Switch
Damper Motor
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