DIN 4754-1 "Heat transfer installations working with organic heat transfer fluids" applies for heat transfer installations in which organic heat transfer fluids are heated to temperatures below or above their initial boiling point at atmospheric pressure. It applies to heat consumers only in spaces where heat transfer fluid passes through them. This standard has the purpose of satisfying protection targets for the production and supply, in particular those specified in the Pressure Equipment Directive (DGRL). It also serves as an aid in the compliance with the specifications of the German Ordinance on Industrial Safety and Health (BetrSichV). DIN 4754-1 "Heat transfer installations working with organic heat transfer fluids" consists of the following parts: Part 1: Safety requirements, test, Part 2: Draught diverter, Part 3: Level controller. This document has been prepared by Working Committee NA 041-01-41 AA "Wärmeübertragungsanlagen" ("Heat transfer installations") at Standards Committee Heating and Ventilation Technology and their Safety (NHRS).