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Regulations & Standardization

This section contains a set of documents and information on regulations and standardization applying to the refrigeration sector at global or regional levels. Original texts and links with reference sites are provided. Summary sheets, glossaries and news prepared by the IIR are also presented.


Global Warming
Ozone Depletion
Refrigerating Systems
Refrigerated Transport



Global Warming

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Ozone Depletion

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Refrigeration Systems

EN 378 "Refrigerating systems and heat pumps - Safety and environmental requirements"

The EN 378 European Standard "Refrigerating systems and heat pumps - Safety and environmental requirements" was prepared by European Committee for Standardization/Technical Committee CEN/TC 182 (Refrigerating systems, safety and environmental requirements). It comprises 4 parts:

Part 1: "basic requirements, definitions, classification and selection criteria" provides definitions of certain terms used in the standard. It also provides a classification system according to:

  • The type of existing refrigerating systems (direct or indirect systems);
  • Usage of the premises:
    • category A: rooms, parts of building or buildings in which persons may sleep or may not have total freedom of movement and where persons are not aware of the safety measures to be applied. Such premises include hospitals, courthouses and prisons, supermarkets, schools, railway stations, etc. and thus are public buildings;
    • category B: rooms, parts of building or buildings in which certain persons may be aware of the general safety measures to be applied. Such premises include production plants, commercial premises, etc;
    • category C: rooms, parts of building or buildings in which all persons present are trained in the general and specific safety measures to be applied. Such premises include specific production plants, cold stores, etc.
  • Refrigerants are classified according to their flammability and toxicity.
    • group L1 (non-toxic, non-flammable refrigerants) forming category A1;
    • group L2 (slightly flammable refrigerants) comprising the categories A2, B1 and B2;
    • group L3 (toxic, flammable refrigerants) comprising the categories A3 and B3.
Annex E contains information on refrigerants and indicates their characteristics (molecular mass, flammability limits, GWP, ODP, etc.).

Part 2: "design, construction, testing, marking and documentation", applies to the design and manufacturing of refrigerating systems.

It defines the various pressure levels that must be applied (maximum allowable pressure), design pressure, etc.), the layout of the refrigerating system piping, the type of valves and pressure-regulating devices to be used. It also defines the testing procedures (tightness testing and testing of safety equipment, testing before commissioning) and acceptance procedures (marking of the refrigerating system and piping, supplying of test certificates, operating manual and plant plans, availability and location of maintenance records).

Part 3: "installation site and personal protection", applies to staff and plant safety.

It defines the principles governing the design and construction of machine rooms (dimensions, types of walls, ventilation) along with specific requirements for refrigerants in groups L1, L2 or L3. Requirements include detectors and alarm systems; protective equipment and the first aid procedures that must be made available to staff.

Part 4: "operation, maintenance, repair and recovery", specifies safety and environmental requirements during plant operation, maintenance and repairs; it places particular emphasis on the training and skills of all persons working on the refrigerating plant (personnel involved in plant operation or monitoring). The standard emphasizes the need to recover and/or reuse refrigerants.

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American Standard ANSI/ASHRAE 34


Refrigerated Transport

Agreement on the international carriage of perishable foodstuffs and on the special
equipment to be used for such carriage (ATP)

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