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that the correct number of cylinders for holding the total system
charge are 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.
