ENGLISH
(Original instructions)
14
repair procedures is required when equipment with am-
mable refrigerants is affected.
In many countries, this training is carried out by national
training organisations that are accredited to teach the
relevant national competency standards that may be set
in legislation.
The achieved competence should be documented by a
certicate.
Training
The training should include the substance of the following:
Information about the explosion potential of ammable
refrigerants to show that ammables 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 signicant effect on the safety. Neverthe-
less, it is possible that leaking refrigerant may accumulate
inside the enclosure and ammable 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 signicant effect
on the safety. Care should be taken to ensure a sufcient
ventilation before.
Ventilated room – (see Clause GG.5) Safety of the appli-
ance depends on the ventilation of
the room. Switching off the appliance or opening of the
housing has no signicant 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 according to IEC 6007915:2010.
Information about the correct working procedures:
Commissioning
Ensure that the oor area is sufcient for the refrigerant
charge or that the ventilation duct is assembled in a
correct manner.
Connect the pipes and carry out a leak test before charg-
ing with refrigerant.
Check safety equipment before putting into service.
Maintenance
Portable equipment shall be repaired outside or in a work-
shop specially equipped for servicing units with ammable
refrigerants.
Ensure sufcient ventilation at the repair place.
Be aware that malfunction of the equipment may be
caused by refrigerant loss and a refrigerant leak is
possible.
Discharge capacitors in a way that won’t cause any spark.
The standard procedure to short circuit the capacitor
terminals usually creates sparks.
Reassemble sealed enclosures accurately. If seals are
worn, replace them.
Check safety equipment before putting into service.
Repair
Portable equipment shall be repaired outside or in a work-
shop specially equipped for servicing units with ammable
refrigerants.
Ensure sufcient ventilation at the repair place.
Be aware that malfunction of the equipment may be
caused by refrigerant loss and a refrigerant leak is
possible.
Discharge capacitors in a way that won’t cause any spark.
When brazing is required, the following procedures shall
be carried out in the right order:
Remove the refrigerant. If the recovery is not required by
national regulations, drain
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 oat back into the building.
Evacuate the refrigerant circuit.
Purge the refrigerant circuit with nitrogen for 5 min.
Evacuate again.
Remove parts to be replaced by cutting, not by ame.
Purge the braze point with nitrogen during the brazing
procedure.
Carry out a leak test before charging with refrigerant.
Reassemble sealed enclosures accurately. If seals are
worn, replace them.
Check safety equipment before putting into service.
Decommissioning
If the safety is affected when the equipment is taken out
of service, the refrigerant charge shall be removed before
decommissioning.
Ensure sufcient ventilation at the equipment location.
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