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e) Make sure that the cylinder is located on the scale before recovery takes place.
f) Start the recovery machine and operate it according to the manufacturer's instructions.
g) Do not overfill cylinders (no more than 80% liquid charge).
h) Do not exceed the maximum working pressure of the cylinder, even temporarily.
i) When the cylinders have been properly filled and the process is complete, ensure that the cylinders
and equipment are removed from the site promptly and that all equipment isolation valves are closed.
j) The recovered refrigerant must not be charged into another refrigeration system unless it has been
cleaned and checked.
17. Labelling
Equipment must be labelled to indicate that it has been taken out of service and emptied of refrigerant.
The label must be dated and signed. Make sure the equipment is labelled to indicate that the equipment
contains a flammable refrigerant.
18. Recovery
When removing refrigerant from a system, whether for maintenance or decommissioning, it is
recommended that all refrigerant be removed safely.
When transferring refrigerant into cylinders, ensure that only suitable refrigerant recovery cylinders are
used. Ensure that the correct number of cylinders are available to hold the full system charge. All
cylinders to be used are designed for the recovered refrigerant and labeled for that refrigerant (i.e.
special cylinders for refrigerant recovery). Cylinders must be complete with the overpressure value and
associated closing values in good working order. Empty recovery cylinders shall be evacuated and, if
possible, cooled before recovery takes place.
The recovery equipment shall be in good working order and shall include a set of instructions concerning
the equipment available and shall be suitable for the recovery of flammable refrigerants.
In addition, a set of calibrated scales shall be available and in good working order. Pipes must be
complete with leak-free disconnecting couplings and in good condition.
Before using the recovery machine, make sure that it is in good working order, that it has been properly
maintained and that all associated electrical components are sealed to prevent ignition in the event of a
refrigerant leak. If in doubt, consult the manufacturer.
The recovered refrigerant must be returned to the refrigerant supplier in the correct recovery cylinder
and the corresponding waste transfer note must be made out. Do not mix refrigerants in the recovery
units and especially not in the cylinders.
If compressors or compressor oils must be removed, ensure that they have been drained to an
acceptable level to ensure that flammable refrigerant does not remain in the lubricant. The evacuation
process must be completed before returning the compressor to the suppliers. Only electrical heating of
the compressor body should be used to speed up this process. The oil change in a system must be
carried out safely.
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