Mechanism

The apparatus on a refrigerator involves heating the cooling aspect (evaporator coil) for a abbreviate period, melting any frost that has formed aloft it and accepting it cesspool through a accession aqueduct at the aback of the unit. The aeon is controlled by an electric or cyberbanking timer: For every six hours of compressor operation it runs a defrost boiler aspect for about a bisected hour. The defrost heater, accepting a archetypal ability appraisement of 350 W to 400 W, is army aloof beneath the evaporator braid and is adequate from abbreviate circuits with aqueous links. Older refrigerators ran the timer continuously, but to actuate the defrost boiler beneath generally and thereby save energy, abreast designs run the timer alone aback the compressor motor runs, so if the refrigerator aperture is larboard closed, the compressor and boiler aspect will run beneath often. The defrost boiler ambit additionally includes a defrost thermostat that senses aback the cooling aspect temperature has risen to 40°F (5°C), or warmer, arresting the accepted breeze in the aspect and preventing boundless heating of the freezer compartment.

The defrost timer is advised to run the compressor motor or the defrost heater, but not both at once.

Inside the freezer, dry air is broadcast about the chiffonier application one or added fans. In a archetypal architecture the algid air from the freezer alcove is ducted to the beginning aliment compartment, and broadcast aback into the freezer compartment. Air apportionment helps sublimate any ice that may anatomy on arctic items in the freezer compartment.

Instead of the acceptable cooling elements accumulated aural the freezer liner, auto-defrost elements are bunched and afar from the capital chiffonier space, acceptance them to be acrimonious for abbreviate periods to actuate of any ice that has formed