Hyundai HYD18KPACWA User Manual page 13

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.
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