Damper Open-Close Mechanism - Electrolux ICON E30SO75ESS Technical & Service Manual

Operation

DAMPER OPEN-CLOSE MECHANISM

Usually, the damper is in the open position except during
convection cooking, reheat, speed grill, speed roast,
speed bake, or all cooking modes which use top / side
heating elements. 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, convection cooking
operation or other cooking operations are 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, Preheat, Speed Grill, Speed Roast, Speed
Bake, or all cooking modes which use the top / side
heating elements:
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 opened
(OFF position).
D. The signal from damper switch is re-sensed in
the control unit and shut-off relay (RY4) is turned
off.
E. The 240 volts A.C. to the damper motor is
removed and the motor turns off.
2. When oven is microwave cooking:
A. 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 ON), 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, if the cavity
air temperature is below 250°F, shut-off relay
(RY4) is energized, and the damper is returned
to the open position.
If the 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.
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