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3.7
Humidifier—Infrared
During normal humidifier operation, deposits of mineral solids will collect in humidifier pan and on
the float switch. These must be cleaned periodically to ensure proper operation. Frequency of cleaning
must be locally established since it is dependant on humidifier usage and local water quality. A spare
pan is recommended to reduce maintenance time at unit. The Liebert autoflush system can greatly
increase the time between cleanings, but does not eliminate the need for periodic checks and
maintenance (see Liebert iCOM
excessive scaling in locations with difficult water quality, the use of Vapure is recommended (contact
your local Emerson representative).
3.7.1
Cleaning Humidifier Pan and Float Switch
Before turning off unit:
1. With unit operating, remove call for humidification at the Liebert iCOM.
2. Let the blower operate 5 minutes to allow the humidifier and water to cool.
3. If unit has a condensate pump, turn unit OFF at the Liebert iCOM.
4. Pull out the humidifier standpipe in pan.
5. Inspect the O-ring (replace if necessary).
6. Let the pan drain and condensate pump operate (if applicable).
7. Disconnect power from the unit.
8. Disconnect the drain coupling from the bottom of the pan.
9. Remove the thermostat from the bottom of the pan and the retaining screws from the sides of the
pan.
10. Slide the pan out.
11. Loosen scale on side and bottom of pan with a stiff nylon brush or plastic scraper.
12. Flush with water.
13. Carefully clean scale off float switch (make sure to reinstall correctly (see Figure 6).
14. Reinstall the pan, thermostat, standpipe, drain coupling and screws into the humidifier.
15. Operate the humidifier and check for leaks.
Figure 6
Correct orientation of float switch
Correct Switch Orientation
™
Liebert
®
Challenger 3000
user manual SL-18835 for autoflush setup). To help reduce
®
Incorrect Switch Orientation
26
Component Operation and Maintenance
DPN000996
Rev. 0
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Troubleshooting
