the complete circuit of an air conditioning system, showing key components and the refrigerant flow path. The system consists of a compressor, condenser, evaporator, and expansion valve, along with refrigerant gas at different pressures and temperatures. The compressor, operating at 320 lbs pressure, compresses the refrigerant gas at 7°F, sending it to the condenser coil, which is cooled by a fan. The condenser releases heat, and the refrigerant changes to liquid at 45°F and 220 lbs pressure. The refrigerant then flows through the expansion valve, where it expands and cools, entering the evaporator at 85 lbs and 2°F. The evaporator absorbs heat from the room, providing cooling, and the refrigerant returns to the compressor to complete the cycle. The diagram also indicates the flow of cold air from the evaporator and warm air being expelled by the system.