www.blaupunkt.com
BAC-PO-1414-Q11L
29
4.
Cabling
Check that cabling is not subject to wear, corrosion, excessive pressure, vibration, sharp
edges, or any other adverse environmental effects. This check should take into account
the effects of wear or continual vibration from sources such as compressors or fans.
5.
Detection of flammable refrigerants
Under no circumstances should potential sources of ignition be used in the search for or
detection of refrigerant leaks. A halide torch (or any other detector utilizing a naked
flame) should not be used.
6.
Leak detection methods
The following leak detection methods are deemed acceptable for systems containing
flammable refrigerants.
Electronic leak detectors should be used to detect flammable refrigerants but may
require re-calibration as sensitivity may not be adequate (detection equipment should
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 should be
set at a percentage of the LFL of the refrigerant and calibrated to the appropriate gas
percentage (25% maximum) confirmed.
Leak detection fluids are suitable for use with most refrigerants. The use of detergents
containing chlorine shall be avoided as the chlorine may react with the refrigerant and
corrode copper pipework.
If a leak is suspected, all naked flames should be removed or extinguished.
If a refrigerant leak that requires brazing is found, all refrigerant must be recovered from
the system or isolated with shut-off valves in a part of the system remote from the leak.
Oxygen-free nitrogen (OFN) must then be purged throughout the system both before
and during the brazing process.
