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• 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-o 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 ammable 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 ammable 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.
9
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