Electrolux EXP09HSECI Manuel D'utilisation page 21

• 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�
Ensure that the outlet for the vacuum
pump is not close to any ignition sources
and there is ventilation available�
Charging procedures
In addition to conventional charging
procedures, the following requirements
shall be followed�
• Ensure that contamination of different
refrigerants does not occur when using
charging equipment� Hoses or lines shall
be as short as possible to minimise the
amount of refrigerant contained in them�
• Cylinders shall be kept upright�
• Ensure that the refrigeration system is
earthed prior to charging the system
with refrigerant�
• Label the system when charging is
complete (if not already)�
• Extreme care shall be taken not to
overfill the refrigeration system�
Prior to recharging the system it shall be
pressure tested with OFN� The system
shall be leak tested on completion of
charging but prior to commissioning� A
follow up leak test shall be carried out prior
to leaving the site�
Decommissioning
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�
1. Become familiar with the equipment and
its operation�
2. Isolate system electrically�
3. 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;
• The recovery process is supervised at all
times by a competent person;
• Recovery equipment and cylinders
conform to the appropriate standards�
4. Pump down refrigerant system, if
possible�
5. If a vacuum is not possible, make a
manifold so that refrigerant can be
removed from various parts of the
system�
6. Make sure that cylinder is situated on
the scales before recovery takes place�
7. Start the recovery machine and operate
in accordance with manufacturer's
instructions�
8. Do not overfill cylinders� (No more than
80 % volume liquid charge)�
9. Do not exceed the maximum working
pressure of the cylinder, even
temporarily�
10. When the cylinders have been filled
correctly and the process completed,
make sure that the cylinders and the
equipment are removed from site
promptly and all isolation valves on the
equipment are closed off�
ENGLISH 21