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A12C
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 atisfactory
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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