15
EN
• In the case of appliances containing flammable refrigerants, flushing of
the refrigerant must be achieved by interrupting the vacuum in the system
with oxygen-free nitrogen and continuing to fill until the working pressure is
reached, then venting to the atmosphere and finally withdrawing to vacuum.
This process must be repeated as long as it does there is no refrigerant in
the system. When an oxygen-free final nitrogen charge is used, the system
is vented to atmospheric pressure to operate on the system. Make sure that
the vacuum pump outlet is not close to potential sources of ignition and that
ventilation is available.
15. Filling procedure
In addition to conventional filling procedures, these requirements
must be met.
• Check that there is no contamination of different refrigerants when using
the filler. Hoses or pipes must be as short as possible to minimize the
amount of coolant contained therein.
• The cylinder must be positioned in accordance with the instructions.
• Ensure that the cooling system is grounded before filling the refrigerant
system.
• After filling, mark the system (if not already marked).
• Make sure that the cooling system does not overflow.
• Before filling the system, a pressure test with the appropriate gas must
be performed. The system must be leak tested after filling or before
commissioning. A subsequent leak test is performed before leaving the
system storage location.
16. Decommissioning
• Before performing this procedure, it is important that the technician knows
the device and all its details. It is recommended that technicians have good
practice and experience to safely restore all refrigerants. Before performing
the task, a sample of oil and coolant is taken if analysis is required before
reuse of recovered refrigerant. It is important that electricity is available
before the job begins.
a) Get to know the device and its operation.
b) Disconnect the system electrically.
c) Make sure that:
• if necessary, a mechanical handling device for handling the cooling rollers
is provided;
• All personal protective equipment is used correctly and available;
• The assembly process is always controlled by a competent person;
• Reclaim and rollers comply with the relevant standards.
d) If possible, exhaust the cooling system.
e) If vacuum is not possible, create a manifold so that the refrigerant can be
removed from different parts of the system.
f) Start the recovery device and operate it according to the instructions. g Do
not roll cylinders (not more than 80% of the liquid volume).
h) Do not exceed the maximum working pressure of the cylinder, even
temporarily.
i) When the cylinders have been correctly filled and the process is complete,
check that the cylinders and equipment are immediately removed from the
site and all isolation valves on the equipment are closed.
(j) Recycled refrigerant shall not be fill to another refrigeration system unless
it has been cleaned and inspected.
