This European Standard is applicable to the design, construction and installing of refrigerating systems including piping, components and materials and including ancillary equipment directly associated with such systems. It also specifies requirements for testing, commissioning, marking and documentation. In case the heat transfer fluid is not gaseous at atmospheric pressure, the requirements for circuits for heat transfer fluids are excluded except for any safety devices associated with the refrigerating system. It is not applicable to refrigerating systems with air or water as refrigerant and does not cover the requirements for equipment to be used in a potentially explosive atmosphere. The following ancillary equipment includes: fan and fan motor; electrical motor and transmission for open compressor systems. This European Standard specifies the requirements relating to stationary and mobile refrigerating systems of all sizes, including heat pumps and automotive comfort air conditioning systems. Systems using refrigerants other than those listed in Annex E of prEN 378-1:2007 are not covered by this standard as long as a safety class is not assigned. Basic safety requirements for refrigerating systems as defined in prEN 378-1 are applicable for this standard. Basic requirements for the installation site as defined in prEN 378-3 apply. This European Standard is not applicable to refrigeration systems and heat pumps which are manufactured before the date of its publication as EN.