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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;
• Evacuate;
• Purge again with inert gas;
• Open the circuit by cutting or brazing.
The refrigerant charge shall be recovered into the correct recovery
cylinders. The system shall be "flushed" 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 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 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.
8. 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.
– Ensure that the refrigeration system is earthed prior to charging the
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