A refrigerator uses basic refrigeration principles to extract the heat from air. Refrigerant circulates between an evaporator and a condenser in a closed system that provides a continual cycle of cooling.
The refrigerator box is heavily insulated so that very little heat is absorbed from the outside air and little cold air escapes. Most refrigerator/freezers introduce chilled air into the freezer section; from there the cold air can pass into the refrigerator. Controls regulate how much cold air may pass.Today, most refrigerators are frost-free. They have automatic defrosting systems so that you don't have to take everything out of your refrigerator to melt built-up ice in the freezer. An automatic defrost system includes a timer, a limit switch, and a heater, which melts away frost.
Refrigerator failure is usually caused by the unit's electrical controls, such as the timer or temperature control.
The ideal temperature for a freezer is between -5 and 5 degrees F and between 36 and 38 degrees F for the fresh food section.
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