14
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
pipe-work 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.
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