Refrigerator is an important part of every home. A refrigerator is defined as an air-conditioned box, which provides temperature controlled storage for food items and other necessities. The interior of a refrigerator is made of glass or plastic. The common applications of a refrigerator are household, retail, transportation and industrial. Every HVAC technicians Should know that how Refrigerator basic work Cycle System. If he know Then it will be easier to repair. you can see Below Diagram of Refrigerator Working System.