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Instead, they use an independent cooling system (for example: an evaporator coil with a defrost heater and a circulating fan in the freezer and a cold-plate or open-coil evaporator in the refrigerator. "Frost-Free" refrigerator/freezer units usually use a heating element to defrost their evaporators, a pan to collect and evaporate water from ...
These motors are sometimes called DC motors, sometimes EC motors and occasionally DC/EC motors. DC stands for direct current and EC stands for electronically commutated.. DC motors allow the speed of the fans within a fan coil unit to be controlled by means of a 0-10 Volt input control signal to the motor/s, the transformers and speed switches associated with AC fan coils are not required.
Frost-free refrigerators and freezers use electric fans to cool the appropriate compartment. [45] This could be called a "fan forced" refrigerator, whereas manual defrost units rely on colder air lying at the bottom, versus the warm air at the top to achieve adequate cooling.
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They are found in virtually every refrigerator, microwave, clothes dryer, space heater, and many more appliances found throughout the home. Another type of thermal switch is a PTC (Positive Temperature Coefficient) thermistor ; these thermistors have a "cutting off" temperature at which the resistance suddenly rises rapidly, limiting the ...