Tripp-Lite SRXCOOL12KEU Manual Del Propietário página 14

Service and Service Precautions
The refrigerant charge should be recovered into the correct recovery cylinders. The system should be "flushed" with OFN to render the unit safe.
This process may need to be repeated several times. Compressed air or oxygen should not be used for this task. Flushing is 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 should be repeated until no refrigerant is within the system. When the final OFN charge is used, the system
should 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 there is ventilation available.
9. Charging Procedures
In addition to conventional charging procedures, the following requirements should be followed.
• Ensure that contamination of different refrigerants does not occur when using charging equipment. Hoses or lines should be as short as
possible so as to minimise the amount of refrigerant contained in them.
• Cylinders should be kept upright.
• Ensure the refrigeration system is earthed prior to charging the system with refrigerant.
• Label the system when charging is complete (if not already).
• Extreme care should be taken not to overfill the refrigeration system. Prior to recharging the system, it should be pressure tested with OFN.
The system should be leak tested on completion of charging but prior to commissioning. A follow-up leak test should be carried out prior to
leaving the site.
10. Decommissioning
Before carrying out this procedure, it is essential 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 should 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 the 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.
• Recovery equipment and cylinders conform to the appropriate standards.
D) Pump down the refrigerant system, if possible.
E) If a vacuum is not possible, make a manifold so that the 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 it in accordance with the 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 the cylinders and the equipment are removed from site
promptly and all isolation valves on the equipment are closed off.
K) Recovered refrigerant should not be charged into another refrigeration system unless it has been cleaned and checked.
11. Labeling
• Equipment should be labeled stating that it has been de-commissioned and emptied of refrigerant. The label should be dated and signed.
Ensure that there are labels on the equipment stating the equipment contains flammable refrigerant.
12. 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 only appropriate refrigerant recovery cylinders are employed. Ensure 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 labeled for
that refrigerant (i.e. special cylinders for the recovery of refrigerant). Cylinders should be complete with the 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 should be in good working order with a set of instructions concerning the equipment that is at hand and should be
suitable for the recovery of flammable refrigerants. In addition, a set of calibrated weighing scales should be available and in good working
order. Hoses should 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. If in doubt, consult the manufacturer.
• The recovered refrigerant should 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 should be carried out prior to returning the compressor to
the suppliers. Only electric heating to the compressor body should be employed to accelerate this process. When oil is drained from a system,
it should be carried out safely.
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