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ENG

- 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

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.

a. Become familiar with the equipment and its operation.

b. Isolate system electrically.

c. Before attempting the procedure, ensure that:

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

- all personal protective equipment is available and being used correctly;

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

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

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

j. When the cylinders have been filled correctly and the process completed, make sure that the cylinders and

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

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

checked.

24. Labelling

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

shall be dated and signed. Ensure that there are labels on the equipment stating the equipment contains

flammable refrigerant.

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

shut-off valves in good working order. Empty recovery cylinders are evacuated and, if possible, cooled before

recovery occurs.

The recovery equipment shall be in good working order with a set of instructions concerning the equipment

that is at hand and shall be suitable for the recovery of all appropriate refrigerants including, when applicable,

flammable refrigerants. In addition, a set of calibrated weighing scales shall be available and in good working

order. Hoses shall be complete with leak-free disconnect couplings and in good condition. Before using the

recovery machine, check that it is in satisfactory working order, has been properly maintained and that any

associated electrical components are sealed to prevent ignition in the event of a refrigerant release. Consult

manufacturer if in doubt.

safely.