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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.
11. Recovered refrigerant shall not be
charged into another refrigeration
system unless it has been cleaned
and checked.
Labelling
Equipment shall be labelled stating that it
has been de-commissioned and emptied
of refrigerant. The label shall be dated
and signed. Ensure that there are labels
on the equipment stating the equipment
contains flammable refrigerant.
ENGLISH
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