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f)
Pump down refrigerant system, if possible. g) lf a vacuum is not possible,
make a manifold so that refrigerant can be removed from various parts
of the system. h) Make sure that cylinder is situated on the scales before
recovery takes place.
i)
Start the recovery machine and operate in accordance with manufacturer's
instructions.
j)
Do not overfill cylinders. (No more than 80 % volume liquid charge).
k)
Do not exceed the maximum working pressure of the cylinder, even
temporarily.
l)
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. m)
Recovered refrigerant shall not be charged into another refrigeration
system unless it has been cleaned and checked.
10 LABELLING
Equipment shall be labelled stating that it has been de-commissioned and
emptied of refrigerant. The label shall be dated and signed. Ensure that there are
labels on the equipment stating the equipment contains flammable refrigerant.
11 RECOVERY
When removing refrigerant from a system, either for servicing or decommissioning,
il 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 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 il 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.
lf 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 healing to the
compressor body shall be employed to accelerate this process. When oil is drained
from a system, il shall be carried out safely.
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