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Defrost Systems in Household Refrigerators. The process of removing the ice or frost from the evaporator or freezer is called as defrosting. The automatic controls employed in the present day refrigerators to prevent the formation of frost on the evaporators are called as the defrost systems. slide 2 of 5.
The defrost timer is the brain of the automatic defrost system. Once in every 24-hour period it disconnects the power to the hermetically sealed compressor/motor and supplies power to the defrost heating element.