Singer SNG21-09IVi, User Manual, Page: 109 / 112

109
GB
109
GB
j) When the cylinders have been fi 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.
k) 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. For appliances
containing
fl ammable refrigerants, ensure that there are labels on the
equipment stating the equipment contains fl 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 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 all appropriate refrigerants
including, when applicable,
fl 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
fl 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.
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