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ENGLISH
shall also consider the effects of aging or continual vibration from sources such
as compressors or fans.
13. Detection of fl ammable refrigerants
Under no circumstances shall potentially sources of ignition be used in the
searching for or detection of refrigerant leaks. A halide torch (or any other de-
tector using a naked
fl ame) shall not be used.
14. Leak detection method
For systems containing fl ammable refrigerants, the following methods for de-
tecting leaks are acceptable:
Electronic leak detectors can be used for the detection of
fl ammable refrig-
erants, but the sensitivity may not be suf fi cient or may require recalibration
(the instrument calibration should be performed in a refrigerant-free environ-
ment) to ensure that the leak detector does not become a potential The ignition
source, and applies to the measured refrigerant, the leak detector should be
set to the lowest
fl ammable concentration of the refrigerant (in percent), cali-
brated with the used refrigerant and adjusted to the appropriate gas concentra-
tion test range (max. 25%)
The leak detection
fl uid is suitable for most refrigerants, but do not use oxygen-
ated solvents to prevent oxygen and refrigerant from reacting and corroding
the copper pipeline If leakage is suspected, all open
fl ames should be re-
moved from the site or extinguished If a leak occurs where welding is required,
all refrigerant should be recovered, or the refrigerant should be completely
isolated away from the leak (using shut-off valves). Before welding and during
welding, use oxygen-free. Nitrogen (OFN) puri
fi es the entire system.
15. Removal and evacuation
When performing maintenance or other operations on the refrigeration circuit,
conventional procedures shall be used. However, for
fl ammable refrigerants it
is important that best practice is followed since fl ammability is a consideration.
The following procedure shall be adhered to:
• remove
refrigerant.
• purge the circuit with inert gas.
• Evacuate vacuum.
• purge with inert gas.
• open the circuit by cutting or brazing.