Tecnolux JC09CA16B1R290 Mode D'emploi page 69

environmental effects. The check shall also take into account
the effects of aging or continual vibration from sources such as
compressors or fans.
5. Detection of flammable refrigerants
Under no circumstances shall potential sources of ignition be
used in the searching for or detection of refrigerant leaks. A
halide torch (or any other detector using a naked flame) shall
not be used.
6. Leak detection methods
The following leak detection methods are deemed acceptable
for systems containing flammable refrigerants. Electronic leak
detectors shall be used to detect flammable refrigerants, but the
sensitivity may not be adequate, or may need re-calibration.
(Detection equipment shall be calibrated in a refrigerant-free
area.) Ensure that the detector is not a potential source of
ignition and is suitable for the refrigerant used. Leak detection
equipment shall be set at a percentage of the LFL of the
refrigerant and shall be calibrated to the refrigerant employed
and the appropriate percentage of gas (25 % maximum) is
confirmed. Leak detection fluids are suitable for use with most
refrigerants but the use of detergents containing chlorine shall
be avoided as the chlorine may react with the refrigerant and
corrode the copper pipe-work. If a leak is suspected, all naked
flames shall be removed/ extinguished. If a leakage of
refrigerant is found which requires brazing, all of the refrigerant
shall be recovered from the system, or isolated (by means of
shut off valves) in a part of the system remote from the leak.
Oxygen free nitrogen (OFN) shall then be purged through the
system both before and during the brazing process.
7. Removal and evacuation
When breaking into the refrigerant circuit to make repairs – or
for any other purpose –conventional procedures shall be used.
However, it is important that best practice is followed since
flammability is a consideration. The following procedure shall be
adhered to:
- Remove refrigerant;
- Purge the circuit with inert gas;
- Evacuate;
- Purge again with inert gas;
- Open the circuit by cutting or brazing.