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NOTE: The use of silicone sealant may impair the effectiveness of some types of leak detection
equipment. It is not necessary to isolate intrinsically safe components before working on them.
10. Repair of intrinsically safe components
Do not apply any permanent inductive or capacitive load to the circuit without making sure that it will
not exceed the permitted voltage and current for the equipment being used.
Intrinsic components are the only types on which you can work under voltage in the presence of a
flammable atmosphere.
Replace components only with parts specified by the manufacturer. Other parts may cause the
refrigerant to ignite in the atmosphere due to leakage.
11. Wiring
Check that the wiring will not be subject to wear, corrosion, excessive pressure, vibration, sharp edges
or any other adverse environmental effects. The check also takes into account the effects of aging or
continuous vibration from sources such as compressors or fans.
12. Detection of flammable refrigerants
Under no circumstances should potential ignition sources be used in the investigation or detection of
refrigerant leaks. A halide torch (or any other detector using an open flame) must not be used.
13. Leak detection methods
The following leak detection methods are acceptable for systems containing flammable refrigerant.
Electronic leak detectors shall be used to detect flammable refrigerants, but sensitivity may not be
adequate or may require recalibration (detection equipment shall be calibrated in a refrigerant-free
area). Ensure that the detector is not a potential source of ignition and that it is suitable for the
refrigerant used.
Leak detection liquids are suitable for most refrigerants, but the use of detergents containing chlorine
should be avoided, as chlorine can react with the refrigerant and corrode copper pipes.
If a leak is suspected, all open flames must be removed/extinguished.
If a refrigerant leak requiring brazing is found, all refrigerant must be recovered from the system.
Oxygen Free Nitrogen (OFN) must then be purged from the system before and during the brazing
process.
14. Withdrawal and evacuation
When introducing refrigerant into the refrigerant circuit for repair - or for any other purpose -
conventional procedures must be used. However, it is important to follow best practices, as flammability
is a factor to consider. The following procedure must be followed :
Remove refrigerant;
Purge the circuit with an inert gas ;
Evacuate ;
Purge again with an inert gas ;
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