ENGLISH
(Original instructions)
15
not in cylinders. If compressors or compressor oils are
to be removed, ensure that they have been evacuated
to an acceptable level to make certain that flammable
refrigerant does not remain within the lubricant. The
evacuation process shall be carried out prior to returning
the compressor to the suppliers. Only electric heating to
the compressor body shall be employed to accelerate
this process. When oil is drained from a system, it shall
be carried out safely.
Competence of service person-
nel
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 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
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 switch-
es, vacuum cleaners, electric heaters.
♦
Information about the different safety concepts:
♦
Unventilated – (see Clause GG.2) Safety of the appli-
ance 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 atmo
-
sphere 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 be taken to ensure a suffi
-
cient 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 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 according to IEC 6007915:2010.
♦
Information about the correct working procedures:
Commissioning
♦ Ensure that the floor area is sufficient 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
charging with refrigerant.
♦
Check safety equipment before putting into service.
Maintenance
♦
Portable equipment shall be repaired outside or in a
workshop specially equipped for servicing units with
flammable refrigerants.
♦ Ensure sufficient 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
workshop specially equipped for servicing units with
flammable refrigerants.
♦ Ensure sufficient 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 float back into the building.
♦
Evacuate the refrigerant circuit.
