How Does a Frost-Free Freezer Work?
Introduction Freezers are convenient appliances that help to store large amounts of food in the home. There are basically two types–chest freezers and upright freezers. Chest freezers have the door on the top of the unit, while uprights resemble compact refrigerators. In the past, freezers had to be defrosted manually. This was a time-consuming process. You had to remove all the food, turn off the freezer, open the door and then let all the ice melt. But now many freezers are frost free or self defrosting. The Parts of a Self-Defrost System There are three parts to an automatic self-defrosting freezer: the timer, heating coil and temperature sensor or thermostat. The timer has two variations. One works like a clock and runs continuously for 24 hours a day. The other runs at set intervals such as every 6 to 8 hours. The heating coil is intertwined with the freezing coil in some models. In other models, there is a defrost heater that lies directly below the freezing coils. Both the heat
