ACR Journal

The RAC Engineer’s Guide to Low GWP Refrigerants 26 Charge calculations Mildly flammable refrigerants bring some complexity by introducing the need to do charge limit calculations. You will need to refer to BS EN 378:2016 for the full calculation methodology. There are several mitigating factors to consider with A2Ls which will include location of equipment, leak detection and ventilation. Many manufacturers of equipment provide specific guidance. Seek clarity if you are unsure. Flammables on the road Transporting A2Ls requires new ways of thinking. Like all refrigerants, care should be taken when they are moved but also bear in mind that A2Ls are not recognised as a separate classification by the ADR Regulations and the guidance on transporting flammable refrigerants applies. Vehicles should be ventilated and there should be a fire extinguisher on hand. The appropriate vehicle marking and documentation is also needed. Training Training and qualifications are essential. Make sure you and your engineers attend suitable training courses focused on the safe use of A2L refrigerants. See Page 32 for more information on training. Great future ahead A2L refrigerants are the next step in refrigeration technology and are instrumental in our industry meeting the phase downs. With their greater energy efficiency, smaller charge sizes and reduced equipment footprints they have a lot to offer the refrigeration engineer and the end user. R404A, the legacy gas for refrigeration systems, has a GWP as high as 3922. By using an A2L refrigerant you can reduce this significantly. R455A (Solstice® L40X) and R454C (Opteon™ XL20) both have a GWP of less than 150 and are excellent alternatives to R404A in commercial refrigeration equipment. If you are still unsure and want further advice, contact your refrigeration suppliers. We are on hand to support you. Versatile options: R455A and R454C