This modular refrigeration training system allows trainees to gain extensive experience of the materials used in refrigeration systems. The training focus of this module is to observe the refrigeration circuit itself. Rather than teaching professional skills as such, its objective is more to gain an understanding for the technology and the function of the components. Various applications, valves and other components of a refrigeration circuit are investigated by means of an authentic cold storage cell under a variety of conditions. The key aspects include how the quantity of refrigerant, the ambient temperature or faults with certain components affect the system. In addition, training is provided in the environmentally conscious handling of refrigerant when filling or emptying the system.