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6. Prior to recharging the system it shall be pressure tested with OFN.
7. 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.
• Become familiar with the equipment and its operation.
• Isolate system electrically.
• Before attempting the procedure ensure that:
1. Mechanical handling equipment is available, if required, for handling
refrigerant cylinders.
2. All personal protective equipment is available and being used correctly.
3. Pump down refrigerant system, if possible.
4. If a vacuum is not possible, make a manifold so that refrigerant can be
removed from various parts of the system.
5. Make sure that cylinder is situated on the scales before recovery takes place.
6. Start the recovery machine and operate in accordance with manufacturer’s
instructions.
7. Do not overll cylinders. (No more than 80 % volume liquid charge).
8. Do not exceed the maximum working pressure of the cylinder, even
temporarily.
9. When the cylinders have been lled 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.
10. 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 ammable refrigerant.
Recovery
• When removing refrigerant from a system, either for servicing or decommissioning,
it is recommended good practice that all refrigerants are removed safely.
• When transferring refrigerant into cylinders, ensure that only appropriate
refrigerant recovery cylinders are employed. Ensure that the correct number of
cylinders for holding the total system charge is available.
• All cylinders to be used are designated for the recovered refrigerant and labelled
for that refrigerant (i.e. special cylinders for the recovery of refrigerant). Cylinders
shall be complete with pressure relief valve and associated shut-off valves in good
working order.
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