The model is plugged onto the base unit, secured using fasteners and connected with refrigerant hoses to become a complete refrigeration circuit. In refrigeration and freezing combinations evaporators are preferably connected in parallel. This is part of the training system for refrigeration and air conditioning technology. To increase the refrigeration capacity, evaporators are operated connected in series. Here different pressure levels in the evaporators can be used to obtain different temperature ranges for refrigeration or freezing. In combination with the base unit the operational model of a refrigeration system with refrigeration and freezing stage results.
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