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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.
Many modern refrigerators automatically control how often the defrost cycle takes place. A defrosting timer is very common to make sure frost removal happens on time, every time, no matter if it is necessary.