cecotec BIGDRY 10000 EXPERT CONNECTED Manual De Instrucciones página 66

ENGLISH
1. Remove the refrigerant.
2. Purge the circuit with inert gas.
3. Evacuate.
4. Purge again with inert gas.
5. Open the circuit by cutting or brazing.
- The refrigerant charge must be recovered from the correct recovery cylinders. The
system must be flushed with oxygen-free nitrogen to render the unit safe. This process
may need to be repeated several times. Oxygen or compressed air must not be used for
the task.
- Cleanliness must be achieved by breaking the vacuum in the system with oxygen-
free nitrogen and continuing to fill until working pressure is reached, then venting to
atmosphere, and finally pushing to a vacuum. This process must be repeated until there
is no refrigerant left in the system. When using the oxygen-free nitrogen end-charge,
the system must be vented to atmospheric pressure to allow for work. This operation is
absolutely vital if brazing operations are to take place on pipes.
- Ensure that the vacuum pump outlet is not near any source of ignition and that
ventilation is available.
8. Loading procedure
In addition to conventional loading procedures, the following requirements must be followed.
- Ensure that no contamination of different refrigerants occurs when using the loading
equipment. Hoses or lines should be kept as short as possible to minimise the amount of
refrigerant contained in them.
- Cylinders must be kept in an upright position.
- Ensure that the refrigeration system is grounded before loading the system with
refrigerant.
- Tag the system when charging is complete (if not already).
- Extreme care must be taken to avoid overfilling the cooling system.
Before reloading, the system must be pressure-tested with oxygen-free nitrogen. The
system shall be leak-tested upon completion of loading, but prior to commissioning. A
subsequent leakage test must be carried out before leaving the site.
9. Commissioning
Before performing this procedure, it is essential that the technician is thoroughly familiar
with the equipment and all its details. It is recommended good practice that all refrigerants
are safely recovered. Before the task is carried out, a sample of oil and refrigerant should be
taken in case an analysis is required before the recovered coolant is reused. It is essential for
there to be power before starting with the task.
A. It is important to get familiar with the equipment and its operation.
B. Electrically isolate the system.
C. Before attempting the procedure, ensure that:
66 BIGDRY 10000 EXPERT CONNECTED