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body shall be employed to accelerate this process. When oil is drained from a system,
it shall be carried out safely.
Competence of service personnel
General
Special training additional to usual refrigerating equipment repair procedures is
required when equipment with flammable refrigerants is affected.
In many countries, this training is carried out by national training organizations that
are accredited to teach the relevant national competency standards that may be set in
legislation.
The achieved competence should be documented by a certificate.
Training
The training should include the substance of the following:
Information about the explosion potential of flammable refrigerants to show that
flammables may be dangerous when handled without care.
Information about potential ignition sources, especially those that are not obvious,
such as lighters, light switches, vacuum cleaners, electric heaters.
Information about the different safety concepts:
Unventilated - (see Clause GG. 2) Safety of the appliance does not depend on
ventilation of the housing. Switching off the appliance or opening of the housing has
no significant effect on the safety. Nevertheless, it is possible that leaking refrigerant
may accumulate inside the enclosure and flammable atmosphere will be released
when the enclosure is opened.
Ventilated enclosure-(see Clause GG. 4)Safety of the appliance depends on ventilation
of the housing. Switching off the appliance or opening of the enclosure has a
significant effect on the safety. Care should betaken to ensure a sufficient ventilation
before.
Ventilated room-(see Clause GG. 5)Safety of the appliance depends on the ventilation
of the room. Switching off the appliance or opening of the housing has no significant
effect on the safety. The ventilation of the room shall not be switched off during repair
procedures.
Information about the concept of sealed components and sealed enclosures the
refrigerant to the outside. Take care that the drained refrigerant will not cause any
danger. In doubt, one person should guard the outlet. Take special care that drained
refrigerant will not float back into the building.
·Evacuate the refrigerant circuit.
·Purge the refrigerant circuit with nitrogen for 5 min.
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