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is not a potential ignition source and that it is suitable for the refrigerant used. The
leak- detection equipment must be set to a percentage of the lower flammability
limit of the refrigerant and calibrated for the refrigerant used with the appropriate
percentage of gas (maximum 25%) confirmed.
Leak-detection fluids are suitable for use with most refrigerants, but the use of
detergents containing chlorine must be avoided, as chlorine can react with the
refrigerant and corrode copper pipes.
If a leak is suspected, all naked flames must be eliminated/extinguished.
If a refrigerant leak is found and requires brazing, all refrigerant must be recovered
from the system, or isolated (by means of shut-off valves) in a part of the system far
away from the leak. Oxygen-free nitrogen must then be purged through the system
both before and during the brazing process.
7. Removal and evacuation
When intervening in the cooling circuit for repairs or any other purpose, conventional
procedures must be followed. However, it is important that best practices are followed,
as flammability is a matter to be taken seriously. The following procedure is to be
followed:
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
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EVVO VENTILADOR PORTÁTIL CLIMA P12 FRÍO Y CALOR
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