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The Complete Air Conditioning System Model "TRAMC/4", is part of the "TRAMC" training system for refrigeration and air conditioning engineering. The model, attached to the base unit by refrigeration hoses and fastened to the frame by bolts, is a full air conditioning system is created for the air cooler that allows for the explanation of the operation of an air conditioning system, the principals components and the recirculating air and outer air operating mode. The purpose of room air conditioning is to shape the room climate in accordance with the requirements of people or sensitive goods. It contains a fan with transparent front part, that recirculates the air between the two air ducts. The top air duct serves as climatic chamber whilst the bottom air duct contains the air cooler, two electric air heaters and a steam humidifier. A motorized butterfly valve in the top air duct allows a change between outer air and recirculating operation. Depending on the combination of the different elements, the air can be cooled, heated, humidified or dehumidified.