Nobu GR-10L User Manual page 13

-Extreme care shall be taken not to overfill the refrigeration system.
Prior to recharging the system is 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 is 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 and being used correctly; the recovery process is
supervised at all times by a competent person; recovery equipment and cylinders conform to the
appropriate standards.
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.
15. Labeling
Equipment shall be labeled 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.
16. Recovery
When removing refrigerant from a system, either for servicing or decommissioning, it is
recommended good practice that all 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. All cylinders to be used are designated for the
recovered refrigerant and labeled 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 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 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 of in doubt.
The recovered refrigerant shall be returned to the refrigerant supplier in the correct recovery
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SAFETY PRECAUTIONS