Becken BDH4758 Manual De Instrucciones página 20

10. Detection of flammable refrigerants
Under no circumstances shall potential sources of ignition be used
when in the search for or detection of refrigerant leaks. A halide torch
(or any other detector using a naked flame) shall not be used.
11. 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.
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 or
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.
12. Removal and evacuation
When accessing the refrigerant circuit to make repairs 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;
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