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- 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
60079-15:2010.
- 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.
- 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 putted out of service, the refrigerant charge
shall be removed before decommissioning.
- Ensure sufficient ventilation at the equipment
location.
- 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.
- 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.
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