Liebert Challenger 3000

Component Operation and Maintenance6.5 Humidifier6.5.1 Infrared HumidifierDuring normal humidifier operation, deposits of mineral solids will collect in the humidifier pan. Thisshould be cleaned out periodically to ensure efficient operation. Each water supply has different characteristics,so the time interval between cleanings must be determined locally. A monthly check (andcleaning if necessary) is recommended.Removing the PanTo remove humidifier pan, first open disconnect switch and open front panel. Allow time for pan andwater to cool. Unlatch front retainer clip (or remove screw from bracket on some units). Pull pan forward.Remove stand pipe to allow pan to drain. Disconnect drain line. Pull pan forward to remove it.!CAUTIONBefore removing pan, be sure power to unit is disconnected and water in the humidifier panis no hotter than lukewarm.Cleaning the PanAn autoflush system can greatly increase the time between cleanings but does not eliminate the needfor periodic checks and maintenance.Scale on the side and bottom can be loosened with a stiff brush. Flush with water and replace pan inhumidifier.Changing Humidifier Lamps1. Open disconnect switch.2. Open front panel.3. Remove screws securing line voltage compartment cover, then remove the cover.4. In line voltage compartment, disconnect one end of the purple jumpers, then locate the burned outbulb with a continuity meter.5. Remove humidifier pan. Refer to Removing the Pan on page 53.6. Remove lamp brackets (2) under lamps.Figure 12 Infrared humidifier lampsHumidifier Lamps7. Loosen two screws securing bulb wires to junction block.8. Pull bulb straight down.9. Replace bulb. Wrap wires once loosely around bulb. This will support the bulb and also allow forthermal expansion. Make sure lamp wires are secure in the junction block.!CAUTIONDo not touch the quartz lamps with your bare hands. Oily deposits such as fingerprints willseverely shorten bulb life. Use clean cotton gloves at all times.10. Reverse Steps 1 through 6 to reassemble.53