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OMEGA ALTISE
IMPORTANT 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, for flammable refrigerants it is important that best
practice is followed since flammability is a consideration. The following procedure shall be adhered
to:
• Remove refrigerant.
• Purge the circuit with inert gas (optional for a2l).
• Evacuate (optional for a2l).
• Purge with inert gas (optional for a2l).
• Open the circuit by cutting or brazing.
• The refrigerant charge shall be recovered into the correct recovery cylinders. For appliances
containing flammable refrigerants other than A2L refrigerants, the system shall be purged with
oxygen-free nitrogen to render the appliance safe for flammable refrigerants. This process may need
to be repeated several times. Compressed air or oxygen shall not be used for purging refrigerant
systems.
• For appliances containing flammable refrigerants, other than A2L refrigerants, refrigerants purging
shall be achieved by breaking the vacuum in the system with oxygen-free nitrogen and continuing to
fill until the working pressure is achieved, then venting to atmosphere, and finally pulling down to a
vacuum. This process shall be repeated until no refrigerant is within the system. When the final
oxygen-free nitrogen 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 pipework are
to take place.
• Ensure that the outlet for the vacuum pump is not close to any potential ignition sources and that
ventilation is 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 in an appropriate position according to the instructions.
• Ensure that the refrigerating 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 refrigerating system.
• Prior to recharging the system, it shall be pressure-tested with the appropriate purging gas. 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 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 recovered 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.
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