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A12C
However, 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;
• 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.
13. Charging procedures（Annex DD.10）
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 minimise the amount of refrigerant contained in them.
– Cylinders shall be kept upright.
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