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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 following order:
– Safely remove the refrigerant following local and national regulations. 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;
– Purge the refrigerant circuit with oxygen free nitrogen;
– Evacuate the refrigerant circuit;
– Purge the refrigerant circuit with nitrogen for 5 min (not required for A2L refrigerants).
– Evacuate again (not required for A2L refrigerants).
– Remove parts to be replaced by cutting or brazing.
– Purge the braze point with nitrogen during the brazing procedure required for repair.
– Carry out a leak test before charging with refrigerant
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.
• 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.
• Fill with nitrogen up to atmospheric pressure.
• Put a label on the equipment that the refrigerant is removed.
e) Disposal
• Ensure sufficient ventilation at the working place.
• 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.
• When flammable refrigerants are used:
a) Evacuate the refrigerant circuit.
b) Purge the refrigerant circuit with oxygen free nitrogen.
c) Evacuate again. (not required for A2L refrigerants)
d) Cut out the compressor and drain the oil.
• Evacuate the refrigerant circuit.
• Purge the refrigerant circuit with nitrogen for 5 min.
• Evacuate again.
• Cut out the compressor and drain the oil.
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ARP-2410
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