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15.Recovery
When removing refrigerant from a system, either for servicing or decommission-
ing, it is recommended good practice that all refrigerants are removed safely.
When transferring refrigerant into cylinders, ensure that only appropriate refriger-
ant 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 refriger-
ant). Cylinders shall be complete with pressure relief valve and associated shut-of
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 manufac-
turer 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 com-
pressors or compressor oils are to be removed, ensure that they have been evac-
uated 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 compres-
sor body shall be employed to accelerate this process. When oil is drained from a
system, it shall be carried out safely.
Non-duct connected appliances containing A2L refrigerants with the supply and
return air openings in the conditioned space may have the body of the appliance
may be installed in open areas such as false ceilings not being used as return air
plenums, as long as the conditioned air does not directly communicate with the
air of the false ceiling.
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