Drazice AIR 3 Manuel d'utilisation et d'installation - Page 10

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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 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

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 system with

refrigerant.

–

Label the system when charging is complete (if not already).

–

Extreme care shall be taken not to overfill the refrigeration system. Prior to recharging the

system, it shall be pressure tested with OFN.

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.

14. Decommissioning

Before carrying out this procedure, it is essential that the technician is completely

familiar with the equipment and all its detail.

It is recommended good practice that all refrigerants are recovered safely. Prior to

the task being carried out, an oil and refrigerant sample shall be taken in case

analysis is required prior to re-use of reclaimed refrigerant. It is essential that

electrical power is available before the task is commenced.

Become familiar with the equipment and its operation.

Isolate system electrically.

CAUTION

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