Bedienungsanleitung WDH 9000K (Seite 26 von 55) (Deutsch, Englisch)

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Information about potential ignition sources, especially those that are not obvious, such as lighters, light

switches, vacuum cleaners, electric heaters.

Information about the different safety concepts:

Unventilated – 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 – 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 – 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 hose 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.

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WDH 9000K Seite 26

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