This item does NOT come with installation or operating instructions. This defrost heater melts frost from the evaporator fins during the automatic defrost cycle. This original Samsung Refrigerator Defrost Heater Metal Sheath originally shipped with the following Samsung devices: RF24FSEDBSR, RF24FSEDBSR/AA This is a true Samsung part! This item is NEW! Don't see your model number? Send us a message as we are happy to help!