Taurus Alpatec AC 293 KT Manuel D'utilisation page 29

COMPETENCE OF SERVICE
PERSONNEL
GENERAL
- Special training additional to usual refrigerat-
ing equipment 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 accred-
ited to teach the relevant national competency
standards that may be set in legislation.
- The achieved competence should be docu-
mented 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) Safe-
ty 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
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 open-
ing 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 compo-
nents and sealed enclosures according to IEC
6007915:2010.
- Information about the correct working proce-
dures:
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 refrig-
erant 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 refrig-
erant leak is possible.
- Discharge capacitors in a way that won't cause
any spark.
- When brazing is required, the following proce-
dures 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.
- Purge the refrigerant circuit with nitrogen for 5
min.
- Evacuate again.
- Remove parts to be replaced by cutting, not by
flame.
- Purge the braze point with nitrogen during the
brazing procedure.