NewAir NAC14KWHD3 Owner's Manual page 32

Information about correct working procedures:
a) Commissioning
• Ensure that the floor area is sufficient for the refrigerant charge or that the
ventilation duct is assembled in the correct manner.
• Connect the pipes and carry out a leak test before charging with refrigerant.
• Check safety equipment before using.
b) Maintenance
• Portable equipment should be repaired outside or in a workshop specially
equipped for servicing units with flammable refrigerants.
• Ensure sufficient ventilation at the repair location.
• Be aware that malfunction of the equipment could be caused by refrigerant
loss and therefore a refrigerant leak is possible.
• Discharge capacitors in a way that will not create sparking. Be aware that the
standard procedure for short circuiting capacitor terminals usually creates
sparks.
• Reassemble sealed enclosures accurately. If seals are worn, replace them.
• Check safety equipment before using.
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 location.
• Be aware that malfunction of the equipment might be caused by refrigerant
loss and that a refrigerant leak is possible.
• Discharge capacitors in a way that will not create sparking.
• When brazing is required, the following procedures should 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.
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