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Replace components only with parts specified by the manufacturer. Other parts can
cause the refrigerant to ignite in the atmosphere as a result of a leak.
Cabling
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Check that the wiring will not be subjected to wear, corrosion, excessive pressure,
vibration, sharp edges or any other adverse environmental effects. The verification
must also take into account the effects of aging or continuous vibration from sources
such as compressors or fans.
Detection of flammable refrigerants
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Under no circumstances should potential ignition sources be used to search for or
detect refrigerant leaks. A haloid lamp (or any other detector using an open flame)
must not be used.
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Leak detection methods
The following leak detection methods are considered acceptable for systems
containing flammable refrigerants.
Electronic leak detectors must be used to detect flammable refrigerants, but their
sensitivity may not be adequate or may require recalibration. (Detection equipment
must be calibrated in an area without refrigerant.) Ensure that the detector is not a
potential source of ignition and is suitable for the refrigerant used. The leak
detection equipment must be set to a percentage LFL of the refrigerant and must be
calibrated to the fluid used and the appropriate percentage of gas (maximum 25%) is
confirmed.
Leak detection fluids are suitable for use with most refrigerants, but the use of
detergents containing chlorine should be avoided as chlorine can react with the
refrigerant and corrode the copper piping.
In the event of a suspected leak, all open flames must be eliminated/extinguished.
If a refrigerant leak is found and brazing is required, all the refrigerant in the system
must be recovered or isolated (by means of shut-off valves) in a part of the system
remote from the leak. The oxygen-free nitrogen must then be purged through the
system both before and during the brazing process.
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Removal and evacuation
When working on the refrigerant circuit for repairs - or for any other purpose -
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