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• evacuate;
• bleed again with an inert gas;
• open the circuit by cutting or by means of brazing.
9a
Oxygen-Free Nitrogen (OFN) MUST be purged through the system
.
both before and during the brazing process.
9b
When the final OFN charge is used, the system must be discharged
.
up to atmospheric pressure to allow the execution of the work. This
operation is absolutely essential if it is desired to carry out brazing
operations on the pipes.
10. The load of refrigerant must be stored in the specific custody
cylinders. The system must "cleaned" with OFN to make the unit
safe. It may be necessary to repeat this process several times. DO
NOT use compressed air or oxygen for this operation.
10a
Make sure that contamination between different refrigerants does
.
NOT occur when a reloading equipment is used. The flexible pipes
or ducts MUST be as short as possible to reduce the quantity of
refrigerant inside them to a minimum.
11. The cylinders must be kept in vertical position.
Only use cylinders suitable for collection of refrigerants. The
cylinders must be complete of a pressure-relief valve and switch off
valves in good conditions.
A set of calibrated weighing scales must also be available.
12. The pipes must be equipped with couplings for disconnection and
must NOT present leaks. Before using the collection machine,
check that it underwent correct maintenance and that the possible
associated electric components are sealed, to prevent switching on
in case of leak of refrigerant.
13. Make sure the refrigerating system is earthed before proceeding
with reloading of the system with refrigerant.
Label the system when reloading is complete.
Pay particular attention not to overload the refrigerating system.
14. Before proceeding with reloading, the system must undergo the
pressure test with OFN and the tightness test at the end of reloading,
but before commissioning. It is necessary to carry out an additional
tightness test before leaving the site.
14a
Remove the refrigerant safely. Move the refrigerant in the cylinders
.
suitable for recovery. Make sure there is a correct number of
cylinders to contain the charge entirely. All cylinders are labelled for
this type of refrigerant (special cylinders for refrigerant recovery).
The cylinders must be complete of a pressure relief valve and of
and of the corresponding closure valve in good conditions. Empty
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