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Specialist's Manual
f)
Make sure that cylinder is situated on the scales
before recovery takes place.
g)
Start the recovery machine and operate in accor-
dance with manufacturer's instructions.
h)
Do not overfill cylinders. (No more than 80% vo-
lume liquid charge).
i)
Do not exceed the maximum working pressure of
the cylinder, even temporarily.
j)
When the cylinders have been filled 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 refrigerating system unless it has been clean-
ed 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 contain-
ing flammable refrigerants, ensure that there are la-
bels on the equipment stating the equipment con-
tains flammable refrigerant.
Recovery
●
When removing refrigerant from a system, either
for servicing or decommissioning, it is recommend-
ed 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 cy-
linders for holding the total system charge is av-
ailable. All cylinders to be used are designated for
the recovered refrigerant and labelled for that refri-
gerant (i.e. special cylinders for the recovery of refri-
gerant). Cylinders shall be complete with pressure-re-
lief valve and associated shut-off valves in good work-
ing 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 includ-
ing, when applicable, flammable refrigerants. In ad-
dition, 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 mac-
hine, check that it is in satisfactory working order,
has been properly maintained and that any associ-
ated electrical components are sealed to prevent
ignition in the event of a refrigerant release. Con-
sult 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 remov-
ed, ensure that they have been evacuated to an ac-
ceptable level to make certain that flammable refri-
gerant does not remain within the lubricant. The ev-
acuation process shall be carried out prior to re-
turning the compressor to the suppliers. Only ele-
ctric heating to the compressor body shall be em-
ployed to accelerate this process. When oil is drain-
ed from a system, it shall be carried out safely.
●
General
That the installation of pipe-work shall be kept to a
minimum.
That compliance with national gas regulations shall
be observed.
That mechanical connections made in accordance
with 22.118 shall be accessible for maintenance
purposes.
45
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