Beko BP109C User Manual page 18

1 Safety awareness
7. Removal and evacuation
When breaking into the refrigerant circuit to make repairs – or for any
other purpose – con-ventional procedures shall be used.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 pipework 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 minimise the amount of refrigerant contained in them.
18 / 220 EN
Portable Air-conditioner / User Manual