Handleiding
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12. Removal and evacuation
When breaking into the refrigerant circuit to make repairs
or for any other purpose conventional procedures shall be
used. However, it is important that best practice is
followed since flammability is a consideration. The
following procedure shall be adhered to:
Remove refrigerant; Purge the circuit with inert gas;
Evacuate; 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 appliance 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 shall be repeated until no refrigerant
is within the system. When the final OFN charge 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. Ensure that
contamination of dierent 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.
Cylinders shall be kept upright.
Ensure that the refrigeration system is earthed prior to
charging the system with refrigerant.
Extreme care shall be taken not to overfill the refrigeration
system. Prior to recharging the system, it shall be pressure
Label the system when charging is complete (if not
already).
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.
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 o.
k) Recovered refrigerant shall not be charged into another
refrigeration system unless it has been cleaned and
checked.
1716
GB
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Productinformatie
| Merk | Point |
| Model | POAC8212 |
| Categorie | Airco |
| Taal | Nederlands |
| Grootte | 9076 MB |
