Refrigerator Troubleshooting

Chlorofluorocarbons (CFCs) are chemical compounds which have been developed for use as refrigerants. Their molecular structure is based on either methane or ethane; one or more of the hydrogen atoms is substituted by chlorine or fluorine.

The CFC refrigerants soon replaced most other refrigerants except ammonia, which is still in use today. Other products made from CFCs were then used for aerosols, expanded foam processes and degreasing agents.

of refrigerants is their chemical stability. It is this long term stability which contributes to the pollution of the atmosphere. Once released, CFCs remain in the atmosphere for years. At low altitudes this does not present a problem. However, when they reach the upper atmosphere CFCs, like ozone, are broken down by ultraviolet light. This results in the release of free radical chlorine atoms, which interfere with the normal formation of ozone and contribute to the greenhouse effect (about 10-15 per cent).

There are now restrictions imposed upon manufacturers of certain CFCs by the Montreal Protocol, an international agreement which came into force in January 1989. Within ten years, production of CFCs should have been reduced to 50 per cent of the 1986 levels.

Refrigeration service and installation engineers can assist in reducing the emission of CFCs. Design engineers can ensure that systems are constructed so that emissions are minimal when various forms of maintenance or repairs are necessary.

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