Cabling; Detection Of Flammable Refrigerants; Leak Detection Methods; Removal And Evacuation - Beko BP207C Bedienungsanleitung

2. Instructions for repairing appliances containing
R290
that this will not exceed the permissible voltage
and current permitted for the equipment in use.
Intrinsically safe components are the only types
that can be worked on while live in the presence
of a flammable atmosphere. The test apparatus
shall be at the correct rating. Replace components
only with parts specified by the manufacturer.
Other parts may result in the ignition of
refrigerant in the atmosphere from a leak.

2.4 Cabling

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.
2.5 Detection of flammable
refrigerants
Under no circumstances shall potential sources of
ignition be used in the searching for or detection
of refrigerant leaks. A halide torch (or any other
detector using a naked flame) shall not be used.

2.6 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 recalibration. (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)
14 / EN
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 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.

2.7 Removal and evacuation

When breaking into the refrigerant circuit to make
repairs – or for any other purpose – con-ventional
procedures shall be used.However, it is important
that best practice is followed since flammability
is a consideration. The following procedure shall
be adhered to: remove refrigerant; purge the
circuit with inert gas; evacuate; purge again with
inert gas; open the circuit by cutting or brazing.
The refrigerant charge shall be recovered into
the correct recovery cylinders. The system shall
be "flushed" with OFN to render the unit safe.
This process may need to be repeated several
times.Compressed air or oxygen shall not be
used for this task. Flushing shall be achieved by
breaking the vacuum in the system with OFN and
continuing to fill until the working pressure is
achieved, then venting to atmosphere, and finally
pulling down to a vacuum. This process shall be
repeated until no refrigerant is within the system.
When the final OFN charge is used, the system
shall be vented down to atmospheric pressure
to enable work to take place.This operation is
absolutely vital if brazing operations on the
pipework are to take place.
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