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Important Safety Information
READ AND FOLLOW ALL SAFETY INSTRUCTIONS
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The refrigerant charge shall be recovered into the correct
recovery cylinders if venting is not allowed by local and
national codes. For appliances containing flammable
refrigerants, the system shall be purged with oxygen-free
nitrogen flammable refrigerants. This process might use
compressed air or oxygen, shall not be used for purging
refrigerant systems.
•
For appliances containing flammable refrigerants,
refrigerant purching shall be achieved by breaking the
vacuum in the system with oxygen-free nitrogen and
continuing to fill until the working pressure is acheived,
then venting to atmosphere, and finally pulling down to a
vacuum (optional for A2L. This process shall be repeated
until no refrigerant is within the system (options for A2L).
When the final oxygen-free charge isused, the system shal
be vented down to atmospheric pressure to enable work
to take place. The outlet for the vacuum pump shall not
be close to any potential ignition sources, and ventilation
shall be available.
Charging procedures
In addition to conventional charging procedures, the following
requirements shall be followed:
•
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.
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Ensure that the refrigeration system is earthed prior to
charging the system with refrigerant.
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Label the system when charging is complete, if not already
labeled.
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Extreme care shall be taken not to overfill the refrigeration
system.
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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.
Decommissioning
Before carrying out this procedure, it is essential that the
technician is completely familiar with the equipment in 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:
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Mechanical handling equipment is available if
required for handling refrigerant cylinders.
•
All personal protective equipment is available and
being used correctly.
A. Pump down refrigerant system, if possible.
B. If a vacuum is not possible, make a manifold so that
C. Make sure that cylinder is situated on the scales before
D. Start the recovery machine and operate in accordance
E. Do not overfill cylinders. No more than 80% volume liquid
F.
G. When the cylinders have been filled correctly and the
H. Recovered refrigerant shall not be charged into another
Labeling
Equipment shall be labeled stating that it has been
decommissioned 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.
Recovery
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 recovers cylinders are employed.
Ensure that the correct number of cylinders for holding the
total system charge are available. All cylinders to be used
are designed for the recovered refrigerant and labeled 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 is it
SAVE THESE INSTRUCTIONS!
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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.
refrigerant can be removed from various parts of the
system.
recovery takes place.
with the manufacturer's instructions.
charge.
Do not exceed the maximum working pressure of the
cylinder, even temporarily.
process is completed, make sure that the cylinders and
the equipment are removed from the site promptly and all
isolation valves on the equipment are closed off.
refrigeration system unless it has been cleaned and
checked.
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