14
EN
10.Repair of sealed components
• When repairing sealed components, all electrical sources must be
disconnected from the equipment being worn before removing closed
covers. If it is necessary to have electrical power to the equipment during
service, then a permanently functioning leak detection form must be
placed at the most critical point in order to warn of a potentially hazardous
situation.
• Particular attention must be paid to the following in order to ensure that
when working on electrical components, the packaging is not altered
in such a way as to affect the level of protection. These include cable
damage, excessive connections, staples that were not made to the original
specification, seal damage, and so on.
• Make sure the device is securely mounted.
• Ensure that seals or sealants are not degraded to the point that they no
longer serve to prevent gas leakage. Spare parts must comply with the
manufacturer‘s specifications.
11. Repair using only safe components
• Safe components are those that are safe in hazardous flammable
environments. Replace components only for parts specified by the
manufacturer. Incorrect components can cause the cooling system to ignite.
12. Cables
• Check that the wiring is not subject to wear, corrosion, excessive pressure,
vibration, sharp edges, or other adverse environmental effects. The effects
of aging or continuous vibration from sources such as compressors or fans
will also be taken into account.
13. Detection of flammable refrigerants
• Under no circumstances should potential sources of ignition be used to
identify or detect refrigerant leaks. A halide burner (or any other open flame
detector) must not be used.
14. Dismantling and Extraction
• Normal procedures must be used when penetrating the coolant circuit
for repair - or any other purpose. However, it is important for flammable
refrigerants to follow best practices as flammability is taken into account.
Here‘s how:
• remove refrigerant;
• clean the circuit with inert gas;
• evacuation;
• rinsing with inert gas;
• open the circuit by cutting or soldering.
• The refrigerant charge must be placed in the correct measuring cup. In
the case of appliances containing flammable refrigerants, the system must
be flushed with oxygen-free nitrogen to protect the appliance safely from
flammable refrigerants. This process may need to be repeated several
times. Compressed air or oxygen must not be used to clean cooling
systems.
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