Here is a little primer on how refrigerators work. Since the evaporator coil operates at temperatures BELOW the FREEZING POINT of water, they will accumulate frost from moisture in the atmosphere. To deal with this and still be able to keep the freezer cold, there is a defrost circuit. This circuit causes the compressor to stop and activates a heating element to melt the frost/ice out of the evaporator. The circuit consists of a timer, a heating element, and a thermostat. The timer turns the defrost circuit on to accomplish the defrost and off when it is finished. Normal cycle is 12 to 24 hours between defrost cycles. The heating element is located below the evaporator coil. When activated, it gets very hot and will glow. The thermostat in the circuit is to prevent the heater from being activated at a temperature outside of a predetermined range of temperatures. There is also a fan behind the evaporator to distribute the cold air throughout the refrigerator. Failure of this fan will also cause the refrigerator section not to be cooled.
When the defrost circuit fails, you can manually defrost the evaporator coil, but it will continue to build up frost/ice and will need periodic defrosting.
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Today's Featured Article - The Ferguson System Principal An implement cutting through the soil at a certain depth say eight inches requires a certain force or draft to pull it. Obviously that draft will increase if the implement runs deeper than eight inches, and decrease if it runs shallower. Why not use that draft fact to control the depth of work automatically? The draft forces are
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