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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:
a) 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.
b) 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.
c) 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.
- 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.
d) 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 refrigerant
leak is possible.
• Discharge capacitors in a way that won’t cause any spark.
