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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 thermostat controls the defrosting cycle of modern refrigerators. The defrost thermostat, a bi-metallic switch, controls the temperature rise in the freezer compartment during the defrost cycle.heck to be sure the thermostat is opening at the correct temperature by placing it in water and slowly heating the water. Defrost thermostats are designed to open between 40 degrees and 90 degrees Fahrenheit.