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Under the Montreal Protocol, it was agreed that ozone-depleting substances, including CFCs and HCFCs, would be phased out globally.
In many systems, it is possible to remove all of the existing CFC refrigerant and replace it with a "retrofit" HCFC or HFC gas.
Often, we can offer retrofit gases that are a "drop in" replacement that require minimal system changes, such as adjustment to expansion valves, and often do not require oil changes.
These diagrams illustrate how CFC gases may be replaced in refrigeration and air conditioning systems.
NB: Natural refrigerants such as R717 (Ammonia), R744 (Carbon dioxide) and hydrocarbons are excellent refrigerant gases, however due to their physical properties, e.g. pressure, flammability, and toxicity, they are not suitable for use as a retrofit gas in existing installations.