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Open the circuit by cutting or brazing.
The refrigerant charge shall be recovered into the correct recovery cylin-
ders. The system shall be „ushed“ with OFN to render the unit safe. This
process may need to be repeated several times. Compressed air or oxygen
shall not be used for this task.
Flushing shall be achieved by breaking the vacuum in the system with
OFN and continuing to ll until the working pressure is achieved, then
venting to atmosphere, and nally pulling down to a vacuum. This process
shall be repeated until no refrigerant is within the system.
When the nal OFN charge is used, the system shall be vented down to
atmospheric
pressure to enable work to take place. This operation is absolutely vital if
brazing operations on the pipe-work are to take place.
Ensure that the outlet for the vacuum pump is not close to any ignition
sources and there is ventilation available. working on them.
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 amma-
ble refrigerant.
Recovery
When removing refrigerant from a system, either for servicing or decom-
missioning, it is recommended good practice that all refrigerants are re-
moved safely.
When transferring refrigerant into cylinders, ensure that only appropriate
refrigerant recovery cylinders are employed. Ensure that the correct num-
ber of cylinders for holding the total system charge is available. All cylin-
ders 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-
o 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 in-
structions concerning the equipment that is at hand and shall be suitable
for the recovery of 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.
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