The intervals between automatic defrost cycles in the refrigerator is controlled by the defrost timer. The control components in the device are moved by the motor of the defrost timer. When the control contacts in the defrost timer advance into the defrost cycle, the compressor stops and the defrost heater turns on for a period of time to melt frost off of the evaporator fins. This encourages more efficient exchange of heat. When the period of defrost ends, the defrost timer contacts switch back to allow normal cooling in the fridge.
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