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–Ensure that contamination of different refrigerants does not
occur when using charging equipment. Hoses or lines shall be as
short as possible to minimize the amount of refrigerant contained
in them.
–Cylinders shall be kept upright.
–Ensure that the refrigeration system is earthed prior to charging
the system with refrigerant.
–Label the system when charging is complete (if not already).
–Extreme care shall be taken not to overfill the refrigeration
system.
● Prior to recharging the system it shall be pressure tested with
OFN. The system shall be leak tested on completion of charging
but prior to commissioning. A follow up leak test shall be carried
out prior to leaving the site.
● Before carrying out this procedure, it is essential that the
technician is completely familiar with the equipment and all its
detail. It is recommended good practice that all refrigerants are
recovered safely. Prior to the task being carried out, an oil and
refrigerant sample shall be taken in case analysis is required prior
to re-use of reclaimed refrigerant. It is essential that electrical
power is available before the task is commenced.
a)Become familiar with the equipment and its operation.
b)Isolate system electrically.
c)Before attempting the procedure, ensure that:
--mechanical handling equipment is available, if required, for
handling refrigerant cylinders;
--all personal protective equipment is available and being used
correctly;
--the recovery process is supervised at all times by a competent
person;
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--recovery equipment and cylinders conform to the appropriate
standards.
d)Pump down refrigerant system, if possible.
e)If a vacuum is not possible, make a manifold so that refrigerant
can be removed from various parts of the system.
f)Make sure that cylinder is situated on the scales before recovery
takes place.
g)Start the recovery machine and operate in accordance with
manufacturer's instructions.
h)Do not overfill cylinders. (No more than 80 % volume 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
refrigeration system unless it has been cleaned and checked.
● 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.
● When removing refrigerant from a system, either for servicing or
decommissioning, it 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.
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