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The Factors affecting the decision The decision as to which approach to take is rarely an obvious one, and requires consideration of many aspects. Type of refrigerant and its availability If a system uses a chlorofluorocarbon (CFC) then it is likely to be difficult to obtain, or even prohibited. The same will apply to hydrochlorofluorocarbons (HCFCs) in the future. Severity of leakage For systems that have a history of high leakage, perhaps due to poor manufacture or construction, or being positioned in a vulnerable location, consideration should be given to replacing them, or redesigning/reinstalling the susceptible parts. Charge of refrigerant Physical size of the system If a system is very large, replacing it with a new system may require considerable cost. Availability of similar (replacement) systems If the system is particularly complex and a replacement is being considered, it should only be done provided a replacement system is easily available. Availability of expertise associated with the type of system Involved types of work or replacing parts or the entire system should only be done provided that sufficient expertise is available. Degree of integration into application Where a system is partially integrated into an application or a building, or is part of a much larger mechanical installation, it is likely to be much easier and more cost effective to carry out minimal work rather than trying to replace it with a new system. Condition/state of equipment For systems in a very poor condition, where perpetual maintenance and repairs are likely, then installation of a new system may be appropriate. If a system has a small charge of controlled or less available refrigerant, then it may not be so problematic to retain it, whereas if the charge is large then it would be sensible to replace it. Availability of alternative refrigerant The choice of alternative refrigerant should ideally be a substance with zero ozone depleting potential (ODP) i.e. not a CFC or HCFC or a blend that contains either. It should have as low a GWP as possible. 5 IntroductionPDF Image | Manual for Refrigeration Servicing Technicians
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