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High pressure side The part of a refrigerating system operating at approximately the condenser or gas cooler pressure. Hydrocarbons (HCs) Chemical compounds consisting of one or more carbon atoms surrounded only by hydrogen atoms. Hydrochlorofluorocarbons (HCFCs) Halocarbons containing only hydrogen, chlorine, fluorine and carbon atoms. Because HCFCs contain chlorine, they contribute to ozone depletion. They are also greenhouse gases. Hydrofluorocarbons (HFCs) Halocarbons containing only carbon, hydrogen and fluorine atoms. Because HFCs contain no chlorine, bromine or iodine, they do not deplete the ozone layer. Like other halocarbons they are potent greenhouse gases. Isolating valve A valve which prevent flow in either direction when closed. Joint A connection made between two parts. Kyoto Protocol The Kyoto Protocol to the United Nations Framework Convention on Climate Change (UNFCCC) was adopted at the Third Session of the Conference of the Parties (COP) to the UNFCCC in 1997 in Kyoto, Japan. It contains legally binding commitments, in addition to those included in the UNFCCC. Countries included in Annex B of the Protocol agreed to reduce their anthropogenic greenhouse-gas emissions (specifically carbon dioxide, methane, nitrous oxide, hydrofluorocarbons, perfluorocarbons and sulphur hexafluoride) by at least 5% below 1990 levels in the commitment period 2008 to 2012. The Kyoto Protocol entered into force on 16 February 2005. Latent heat It is the amount of heat needed to change the phase of a pure substance where temperature remains constant. Liquid receiver A vessel permanently connected to a system by inlet and outlet pipes for accumulation of liquid refrigerant. Low pressure side The part of a refrigerating system operating at approximately the evaporator pressure. Machinery room A completely enclosed room or space, vented by mechanical ventilation and only accessible to authorized persons, which is intended for the installation of components of the refrigerating system or of the complete refrigerating system. Other equipment may also be installed provided it is compatible with the safety requirements for the refrigerating system. Maintenance All kinds of work that may be performed by a maintenance technician, primarily related to ensuring the continued good operation and working of refrigeration systems, as well as record-keeping. Materials safety data sheet (MSDS) A safety advisory bulletin prepared by chemical producers for a specific refrigerant or compound. Maximum allowable pressure The maximum pressure for which the equipment is designed, as specified by the manufacturer. Maximum working pressure The maximum pressure for which the equipment is designed, as specified by the manufacturer. Mobile system A refrigerating system which is normally in transit during operation. Montreal Protocol The Montreal Protocol on Substances that Deplete the Ozone Layer was adopted in September 1987. Following the discovery of the Antarctic ozone 146 GlossaryPDF Image | Manual for Refrigeration Servicing Technicians
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