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6 Charging of refrigerant The charging of refrigeration systems with hydrocarbon refrigerants is similar to those using halocarbon refrigerants. As with all blend refrigerants, hydrocarbon refrigerant blends should also be charged in the liquid phase in order to maintain the correct composition of the blend. The following additional requirements should be adhered to: • Ensure that contamination of different refrigerants does not occur when using charging equipment. Hoses or lines are to be as short as possible to minimise the amount of refrigerant contained in them. • Cylinders must be kept upright. • Charge the refrigerant in the liquid phase. • Ensure that the refrigeration system is earthed prior to charging the system with refrigerant. • Label the system when charging is complete. The label should state that hydrocarbon refrigerants have been charged into the system and that it is flammable. Position the label in a prominent position on the equipment. • Extreme care shall be taken not to overfill the refrigeration system. Hydrocarbon charge sizes are typically 40% to 50% of CFC, HCFC and HFC charge sizes. • The system must be leak tested on completion of charging. Cylinder handling Safe cylinder handling differs little from other refrigerant cylinders which are as follows: • Do not remove or obscure the official labelling on a cylinder. • Always refit the valve cap when the cylinder is not in use. • Use and store cylinders in an upright position. • Check the condition of the thread and ensure that it is clean and not damaged. • Store and use cylinders in dry, well-ventilated areas remote from fire risk. • Do not expose cylinders to direct sources of heat such as steam or electric radiators. • Do not repair or modify cylinders or cylinder valves. • Always use a proper trolley for moving cylinders even for a short distance – never roll cylinders long the ground. • Take precautions to avoid oil, water and foreign matter entering the cylinder. • If it is necessary to warm the cylinder, use only warm water or air, not naked flames or radiant heaters. The temperature of the water or air must not exceed 40°C. • Always weigh the cylinder to check if it is empty – its pressure is not an accurate indication of the amount of refrigerant that remains in the cylinder. • Use only dedicated recovery cylinders for the recovery of hydrocarbon refrigerants. 136 Safe Refrigerant HandlingPDF Image | Manual for Refrigeration Servicing Technicians
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