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Important Safety Information
READ AND FOLLOW ALL SAFETY INSTRUCTIONS
Removal and evacuation
When breaking into the refrigerant circuit to make repairs or for any other purpose conventional procedures shall be
used. However, it is important that the best practice is followed since flammability is a consideration. The following
procedures shall be adhered to:
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Safely remove refrigerant following local and national regulations;
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Evacuate;
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Purge the circuit with inert gas (optional for A2L);
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Evacuate (optional for A2L);
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Continuously flush or purge with inert gas when using flame to open circuit: and
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Open the Circuit.
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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.
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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:
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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.
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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.
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All personal protective equipment is available and being used correctly.
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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.
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 the 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 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.
K. Recovered refrigerant shall not be charged into another refrigeration system unless it has been cleaned and
checked.
SAVE THESE INSTRUCTIONS!
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