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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.
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If a leak is suspected, all naked flames must be eliminated/extinguished.
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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.
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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.
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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.
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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.
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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.
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Cylinders must be kept in an upright position.
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Ensure that the refrigeration system is grounded before loading the system with
refrigerant.
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Tag the system when charging is complete (if not already).
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Extreme care must be taken to avoid overfilling the cooling system.
AIRCLIMA 9000 SMARTFRESH/ AIRCLIMA 12000 SMARTFRESH/ AIRCLIMA 18000 SMARTFRES/
AIRCLIMA 24000 SMARTFRESH/ AIRCLIMA 12000 SMARTFRESH CONNECTED
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