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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.
14. 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.
a ) Become familiar with the equipment and its operation. b) Isolate
system electrically. c) 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. d) Pump down
refrigerant system, if possible. e) If a vacuum is not possible, make
a manifold so that refrigerant can be removed from various parts of
the system. f) Make sure that cylinder is situated on the scales
before recovery takes place. g) Start the recovery machine and
operate in accordance with manufacturer's instructions. h) Do not
overfill cylinders. (No more than 80 % volume liquid charge).
i ) Do not exceed the maximum working pressure of thecylinder, even
temporarily. j) 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. k) Recovered refrigerant shall not
be charged into another refrigeration system unless it has been
cleaned and checked.
15. 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.
16. 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. Empty recovery cylinders are
evacuated and, if possible, cooled before recovery occurs. The
recovery equipment shall be in good working order with a set of
instructions concerning the equipment that is at hand and shall be
suitable for the recovery of flammable refrigerants. In addition, a set
of calibrated weighing scales shall be available and in good working
order. Hoses shall be complete with leak-free disconnect couplings
and in good condition. Before using the recovery machine, check
that it is in satisfactory working order, has been properly maintained
and that any associated electrical components are sealed to prevent
ignition in the event of a refrigerant release. Consult manufacturer if
in doubt. The recovered refrigerant shall be returned to the
refrigerant supplier in the correct recovery cylinder, and the relevant
Waste Transfer Note arranged. Do not mix refrigerants in recovery
units and especially not in cylinders. If compressors or compressor
oils are to be removed, ensure that they have been evacuated to an
acceptable level to make certain that flammable refrigerant does not
remain within the lubricant. The evacuation process shall be carried
out prior to returning the compressor to the suppliers. Only electric
heating to the compressor body shall be employed to accelerate this
process. When oil is drained from a system, it shall be carried out
safely.
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