This document provides technical specifications for the operation, servicing, maintenance, repair and decommissioning of refrigeration, air conditioning and heat pump equipment containing flammable refrigerants, in particular from class A3, complementing existing standards. Refrigerants from toxicity class B are excluded from this scope. This document includes risk mitigation measures not yet addressed in existing standards for specific refrigerant classes, or not fully reflecting the state of the art, and establishes complementary technical specifications for the operation, servicing, maintenance, repair and decommissioning. The following aspects are considered: - explosive atmosphere workplace and equipment; NOTE Further information can be found in Directive 99/92/EC (ATEX Workplace Directive) and Directive 2014/34/EU (ATEX Equipment Directive). - good practice for the operation, servicing, maintenance, repair and decommissioning, including tools and personal protection; - risk mitigation methods; - risk assessments; - competence of personnel; - health and safety of personnel; - location of the equipment.