Argo MADISON Manuale di istruzioni per l'uso - Pagina 18

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Argo MADISON Manuale di istruzioni per l'uso

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remove refrigerant;

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purge the circuit with inert gas; evacuate;

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purge again with inert gas;

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open the circuit by cutting or brazing.

The refrigerant charge shall be recovered into the correct recovery cylinders.

For appliances containing flammable refrigerants, 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 purging

refrigerant systems.

For appliances containing flammable refrigerants, 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 that ventilation is available.

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.

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 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

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

and all its detail. lt 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. lt is essential that electrical power is available before the task is commenced.

Become familiar with the equipment and its operation.

Isolate system electrically.

Before attempting the procedure, ensure that:

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mechanical handling equipment is available, if required, for handling refrigerant cylinders;

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all personal protective equipment is available and being used correctly;

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the recovery process is supervised at all times by a competent person;

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recovery equipment and cylinders conform to the appropriate standards.

Pump down refrigerant system, if possible.

lf a vacuum is not possible, make a manifold so that refrigerant can be removed from various parts of

the system.

Make sure that cylinder is situated on the scales before recovery takes place.

Start the recovery machine and operate in accordance with manufacturer's instructions

Do not overfill cylinders. (No more than 80 % volume liquid charge).

Do not exceed the maximum working pressure of the cylinder, even temporarily.

When the cylinders have been filled correctly and the process compieted, make sure that the cylinders

and the equipment are removed from site promptly and all isolation valves on the equipment are closed off.

k. Recovered refrigerant shall not be charged into another refrigeration system unless it has been cleaned and

checked.

Labelling

Equipment shall be labelled stating that it has been de-commissioned and emptied of refrigerant. The label shall

be dated and signed. For appliances containing flammable refrigerants, ensure that there are labels on the

equipment stating the equipment contains flammable refrigerant.

Recovery

When removing refrigerant from a system, either for servicing or decommissioning, it is recommended good

practice that all refrigerants are removed safely.

When transferring refrigerant into cylinders, ensure that only appropriate refrigerant recovery cylinders are

employed. Ensure that the correct number of cylinders for holding the total system charge are available. AII

cylinders to be used are designated for the recovered refrigerantand labelled for that refrigerant (i.e. special

cylinders for the recovery of refrigerant). Cylinders shall be complete with pressure-relief valve and assodated

V 01/22