Manual for Refrigeration Servicing Technicians

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Manual for Refrigeration Servicing Technicians ( manual-refrigeration-servicing-technicians )

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4 Why charge refrigerant blends as liquids? Refrigerant blends are simply a mixture of different refrigerant components. If the blend is a zeotropic mixture (i.e. R4xx) and it is charged as vapour, the refrigerant with the highest vapour pressure will be charged at a higher proportion than the other component(s). Charging as a liquid is the only way to guarantee that the blend is charged within its intended composition. Fractionation of a refrigerant blend (separation of the individual components) can occur by removing the refrigerant from the cylinder as a vapour instead of a liquid. This can potentially lead to both safety and performance issues. As such, it is recommended charging all blends in liquid phase only. From a safety standpoint, a blend with an A1 safety classification – that has been composed of non-flammable and flammable substances – will remain non- flammable, even after fractionation has occurred. Performance may be significantly affected, depending on the extent of fractionation. If only a small amount of the refrigerant placed into the system was charged as vapour, the blend may perform adequately. The performance of systems containing larger percentages of a blend charged as vapour is more likely to be affected by fractionation. Typically, more of the high-pressure components will be found in the system, and less in the cylinder. Additionally, the refrigerant remaining in the cylinder may also be compromised. In these cases, it is recommended contact technical support of the refrigerant supplier. It is also important to note that if the entire contents of a refrigerant blend container (full cylinder) are charged into a system as vapour, it will produce the same effect as charging the entire cylinder as liquid. Also, certain refrigerant blends are more susceptible to fractionation than others, and their stated temperature glide provides an indication of this. For example, fractionation is a greater concern when working with R409A (high temperature glide, ~ 8 K) than when working with R410A (a small glide, < 1 K). 107 Servicing Practices

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