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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.
Once my unit is defrosting how long will it take? Either of two factors can bring the unit out of a defrost cycle. Firstly, if the sensors on the outdoor unit detect that itâs heat exchanger temperature has risen enough, the unit will stop defrosting. Secondly, if the sensors do not stop it beforehand, the maximum time a unit will be in defrost cycle is around 10 minutes.