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ried out prior to returning the compressor to the suppliers.
Only electric heating to the compressor body shall be em-
ployed 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 equip-
ment repair procedures is required when equipment with
flammable refrigerants is affected.
In many countries, this training is carried out by nation-
al training organisations that are accredited to teach the
relevant national competency standards that may be set in
GB
legislation.
The achieved competence should be documented by a cer-
tificate.
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 signif-
icant effect on the safety. Nevertheless, it is possible that
leaking refrigerant may accumulate inside the enclosure
and flammable atmosphere will be released when the en-
closure 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 signifi-
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