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ELECTROLUX ELECTRONICS
The top of the range cabinets will be fitted with an Electrolux Electronic control. This consists of a
Control Board, Relay Board, User Interface (Control Display) and Two Sensors. Functionally this
replaces the thermostat and defrost timer and provides some extra features.
DESCRIPTION OF CONTROL AND OPERATION
COMPONENTS
The electronic control consists of the following parts-
Control Board located in the machine compartment.
Relay Board located in the top right hand side of the food compartment control housing.
User Interface (Control Display) recessed into the front of the freezer compartment door
Two sensors, one in the fresh food compartment and one in the freezer compartment (wired into
the cabinet harness)
The Control Board houses the transformer, 3 Triacs (compressor, fan and defrost heater) and input
circuitry to monitor when the door/defrost heater is open/on and for how long. A processor controls the
timing on some of the functions such as the door alarm and also communication between the Control
Board and User Interface (Control Display).
The Relay Board houses the transformer and 3 relays (water valve, block ice soleniod and auger motor).
This is to facilitate the use of 5 and 12 volt wiring only through the freezer door hinge to the user
interface (Control Display) in the freezer door.
The User Interface (Control Display) consists of a LCD Display with white backlighting, 6 LED down
lights and nine push buttons. A processor controls the LCD segments and also communication between
the User Interface (Control Display) and Control Board.
The sensors are negative temperature coefficient silicon devices encapsulated in a PVC tube sealed with
epoxy resin. Typical resistance at 25°C is 5000 ohms, at 0°C is 16325 ohms and at -25°C is 65200 ohms.
OPERATIONAL SUMMARY
The system operates under software control from direct current inputs from sensors located in the freezer
and fresh food compartments.
The fresh food compartment is supplied with cold air from the freezer compartment by a fan located in
the freezer compartment. The flow of air to the fresh food compartment is controlled by a motorised
baffle that is either fully open or fully closed. This baffle takes 12 seconds to open or close.The baffle is
located in the rear control housing at the air outlet of the freezer.
When the freezer compartment is too warm, the compressor is turned on (by the freezer sensor signal)
together with the fan. The fan draws refrigerated air (dry, sub-zero air) from a finned evaporator coil.
When the fresh food compartment is too warm, the baffle in the rear control housing is opened.
Depending on which cycle the refrigerator is in (On or Off) depends on which of the following will occur
• If the freezer fan and compressor are on, the cold air will flow from the freezer into the food
compartment.
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