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• there are no live electrical components and that the cables are not exposed
while loading, recovering or bleeding the system;
• there is continuity in the ground connection.
8. Periodically check that the cables are not subject to wear, corrosion, excessive
pressure, vibrations, sharp edges or any other hostile environmental situation.
9. When intervening inside the refrigerating circuit to carry out repairs or for any
other reason, the conventional procedures must be followed:
• remove the refrigerant;
• bleed the circuit with an inert gas;
• 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).
EN - 9
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