VEVOR BBD-230L Originalanleitung Seite 18

appliances containing flammable refrigerants, the system shall be purged
with oxygen-free nitrogen to render the appliance safe for flammable
refrigerants. This process might need to be repeated several times.
Compressed air or oxygen shall not be used for purging refrigerant
systems.
• For appliances containing flammable 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.
• 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.
1) 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.
2) Cylinders shall be kept in an appropriate position according to the
instructions.
3) Ensure that the REFRIGERATING SYSTEM is earthed prior to charging
the system with refrigerant.
4) Label the system when charging is complete (if not already).
5) 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:
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