ACR Journal

25 The RAC Engineer’s Guide to Low GWP Refrigerants Advances with tools A2Ls require a different approach and engineers need to be more aware of how to handle them, while also ensuring that they have the right tools to do so. Users must not retrofit a system operating on a non-flammable refrigerant to an A2L – these mildly flammable products must only be used with new, purpose-built equipment. Manifolds and hoses are already on the market and enable engineers to do the job safely. Whatever the task, make sure that you only use approved equipment. If in doubt, always ask. The Safe Seal Charging Hoses, from JAVAC, are a good option for those looking for suitable equipment – see Page 28 for more information. Recovery Refrigerant recovery machines and suitable recovery cylinders can only be used which are specifically designed to handle mildly flammable refrigerants. The good news is that such units and cylinders are available off the shelf to tackle these jobs. It is not recommended to mix A2L refrigerants with other types of gases in recovery cylinders. Do not exceed the stated safe weight for the cylinder when recovering the gas – the figure is stenciled on the cylinder – and make sure you complete all the F-Gas records. Product cylinders The cylinders containing A2L refrigerants, such as R32, are easily recognisable by the red shoulder, labelling and valve connection. All A2L cylinder valves have a left-hand thread, whereas standard HFCs have a right-hand thread.