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or continual vibration from
sources such as compressors
or fans.
• 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 leakage of refrigerant is
found which requires brazing,
all of the refrigerant shall be
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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.
• Before carrying out this
procedure, it is essential
that the technician is
completely familiar with the
equipment and all its detail.
It is recommended good
practice that all refrigerants
are recovered safely. Prior
to the task being carried out,
an oil and refrigerant sample
shall be taken in case analysis
is required prior to re-use of
reclaimed refrigerant. It is
essential that electrical power
is available before the task is
commenced.
• Become familiar with the
equipment and its operation.
• Isolate system electrically.
• Before attempting the
procedure ensure that:
– mechanical handling
equipment is available,
if required, for handling
refrigerant cylinders.
– all personal protective
equipment is available and
being used correctly.
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30-11-2022 14:53:22
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