13
SAFETY INSTRUCTIONS
ENGLISH
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 also 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.
NOTE
Examples of leak detection fluids are
- bubble method
- fluorescent method agents
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