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6 Manuals and instructions Before handling hydrocarbon refrigerants be aware of detailed information to be provided in manuals for the installation, service and operation (be they separate or combined manuals). The manuals will include all the relevant information about the equipment, such as the maximum refrigerant charge, the minimum rated airflow if required, the minimum floor area of the room or any other special requirements, as well as all the corresponding warnings. Importantly, they must all provide the necessary information and instructions for the correct handling of flammable refrigerants and associated equipment, refrigerant detection, charging, equipment decommissioning, removal, recovery and storage of the refrigerant, and aspects related to ensuring the integrity of the protection for electrical components. Only competent professionals trained in the use of flammable refrigerants are permitted to open equipment housing or to break into the refrigerant circuit, and the maintenance and repair requiring the assistance of another skilled person should be carried out under the supervision of the competent individual. General Approach to hydrocarbon refrigerant handling Any equipment used in the process of repair must be suitable for use with flammable refrigerants. All tools and equipment (including measuring equipment) are to be checked for suitability for working on the equipment, particular attention is to be paid to the selection of: • Refrigerant recovery units • Refrigerant leak testing units • Electrical test meters • Refrigerant recovery cylinders • Portable lighting. If the installation permits, it is recommended that the equipment be removed from its existing position to a controlled workshop environment suitable for the type of repair where work can be conducted safely. Safety check of the working area Prior to beginning work on systems containing hydrocarbon refrigerants, safety checks are necessary to ensure that the risk of ignition is minimised. For repair to the refrigerating system prior to conducting work on the system, the following precautions shall be complied with: • Work shall be undertaken under a controlled procedure so as to minimise the risk of a flammable gas or vapour being present while the work is being performed. • All maintenance staff and others working in the local area should be instructed as to the nature of work being carried out. • Work in confined spaces must be avoided. The area around the workspace is to be sectioned off. • Ensure that the conditions within the area have been made safe by the control of flammable material. • The area shall be checked with an appropriate refrigerant detector prior to and during work to ensure that the technician is aware of potentially flammable atmospheres. Ensure that the 132 Safe Refrigerant HandlingPDF Image | Manual for Refrigeration Servicing Technicians
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