Bedienungsanleitung WDH 9000K (Seite 25 von 55) (Deutsch, Englisch)

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d) Pump down refrigerant system, if possible.

e) If a vacuum is not possible, make a manifold so that refrigerant can be removed from various parts of the

system.

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

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

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 on the equipment are closed off.

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

checked.

10. 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.

11. 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 is available. All cylinders to be used are designated for the recovered

refrigerant and labelled for that refrigerant (i.e. special 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 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. The recovered refrigerant shall be returned to the

refrigerant supplier in the correct recovery cylinder, and the relevant Waste Transfer Note arranged. Do not

mix refrigerants in recovery units and especially not in cylinders. If compressors or compressor oils are to be

removed, ensure that they have been evacuated to an acceptable level to make certain that flammable

refrigerant does not remain within the lubricant. The evacuation process shall be carried out prior to

returning the compressor to the suppliers. Only electric heating to the compressor body shall be employed to

accelerate this process. When oil is drained from a system, it shall be carried out safely.

Competence of service personnel

General

Special training additional to usual refrigerating equipment repair procedures is required when equipment with

flammable refrigerants is affected.

In many countries, this training is carried out by national training organisations that are accredited to teach the

relevant national competency standards that may be set in legislation.

The achieved competence should be documented by a certificate.

Training

The training should include the substance of the following:

Information about the explosion potential of flammable refrigerants to show that flammables may be

dangerous when handled without care.

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WDH 9000K Seite 25

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