• The appliance shall be
installed in accordance with
national wiring regulations;
• The maximum refrigerant
charge amount: 45g;
• An unventilated area where
the appliance using flammable
refrigerants is installed shall
be so constructed that should
any refrigerant leak, it will not
stagnate so as to create a fire
or explosion hazard.
• The appliance shall be stored
so as to prevent mechanical
damage from occurring.
• Check that cabling will not be
subject to wear, corrosion,
excessive pressure, vibration,
sharp edges or any other
adverse environmental
effects. The check shall
also take into account the
effects of aging 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
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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
refrigeran s 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. 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
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