S. 34
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) 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 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 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 60079-15:2010.
Information about the correct working procedures:
1.
Commissioning o
Ensure that the floor area is sufficient for the refrigerant charge or that the
ventilation duct is assembled in a correct manner.
o
Connect the pipes and carry out a leak test before charging with refrigerant.
o
Check safety equipment before putting into service.
2.
Maintenance o
Portable equipment shall be repaired outside or in a workshop specially
equipped for
servicing units with flammable refrigerants.
o
Ensure sufficient ventilation at the repair place.
o
Be aware that malfunction of the equipment may be caused by refrigerant loss and a refrigerant leak is
possible. o
short circuit the capacitor terminals usually creates sparks. o
Reassemble sealed enclosures
accurately. If seals are worn, replace them.
o
Check safety equipment before putting into service.
3.
Repair o Portable equipment shall be repaired outside or in a workshop specially equipped for
servicing units with flammable refrigerants.
o
Ensure sufficient ventilation at the repair place.
o
Be aware that malfunction of the equipment may be caused by refrigerant loss and a
refrigerant leak is possible.
o
o
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.
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.
4.
Decommissioning o If the safety is affected when the equipment is putted out of service, the
refrigerant charge shall be removed before decommissioning.
o
Ensure sufficient ventilation at the equipment location.
o
Be aware that malfunction of the equipment may be caused by refrigerant loss and a
refrigerant leak is
possible. o
o
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.
o
Evacuate the refrigerant circuit. o
Purge the refrigerant circuit with nitrogen for 5 min. o
Evacuate
again. o
Fill with nitrogen up to atmospheric pressure.
o
Put a label on the equipment that the refrigerant is removed.
5.
Disposal o Ensure sufficient ventilation at the working place.
o
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.
