This Standard specifies the requirements relating to the safety of persons and property for the design, construction, installation and operation of refrigerating systems.
It applies to all types of refrigerating systems in which the refrigerant is evaporated and condensed in a closed circuit, including heat pumps and absorption systems, except for systems using water or air as the refrigerant.
Individual safety standards for identifiable types of refrigerating systems may deviate from requirements set forth in this Standard to accommodate particular needs, provided that there is no reduction in the level of safety achieved.
This Standard is applicable to new refrigerating systems, extensions and modifications of already existing systems, and for used systems on being transferred to and operated on another site. Deviations are permissible only if equivalent protection is ensured.
It also applies in the case of the conversion of a system for another refrigerant.
2 Normative References
The following standards contain provisions which, through reference in this text, constitute provisions of this Standard. At the time of publication, the editions indicated were valid. All standards are subject to revision, and parties to agreements based on this Standard are encouraged to investigate the possibility of applying the most recent editions of the standards indicated below.
GB 4706.13-1998 Safety of household and similar electrical appliances- Particular requirements for refrigerators, food-freezers and ice-makers (idt IEC 335-2-24: 1992)
GB 4706.17-1996 Safety of household and similar electrical appliances-Particular requirements for motor-compressors (idt IEC 335-2-34: 1980)
GB 4706.32-1996 Safety of household and similar electrical appliances-Particular requirements for electrical heat pumps, air-conditioners and dehumidifiers (idt IEC 335-2-40: 1980)
GB/T 5226.1-1996 Electrical equipment of industrial machines. Part 1: General requirements (eqv IEC 204-1: 1992)
GB/T 7778-2001 Number designation and safety classification of refrigerants (neq ISO 817: 1974)
GB/T 12241-1989 Safety valves-General requirements (eqv ISO 4126: 1984)
JB 8654-1997 Safety requirements of positive displacement and centrifugal water-chilling packages
JB 8655-1997 Safety requirements of unitary air conditioners
JB 8656-1997 Safety requirements of absorption water Cchilling (or) heating packages
3 Definitions
For the purposes of this Standard, the following definitions apply.
3.1
abnormal fire risk
Fire risk that may arise from conflagration uncontrollable by the normal fire fighting facilities of a municipality.
3.2
absorption (or adsorption) refrigerating system
system in which refrigeration is effected by evaporation of a refrigerant, the vapour then being absorbed (or adsorbed) by an absorbent (or adsorbent) medium, from which it is subsequently expelled at a higher partial vapour pressure by heating and liquefied by cooling.
