Idiomas disponibles
Idiomas disponibles
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Purge the circuit with inert gas;
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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. The system shall
times. Compressed air or oxygen shall not be used for this task.
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 there is
ventilation available.
13. Charging procedures
In addition to conventional charging procedures, the following requirements shall be followed.
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Ensure that contamination of different refrigerants does not occur when using charging
equipment. Hoses or lines shall be as short as possible to minimize the amount of refrigerant
contained in them.
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Cylinders shall be kept upright.
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Ensure that the refrigeration system is earthed prior to charging the system with refrigerant.
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Label the system when charging is complete (if not already).
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Prior to recharging the system it 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 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;
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.
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