Vertiv Liebert DSE - Infrared Humidifier Maintenance; Cleaning Humidifier Pan and Float Switch

10.3 Infrared Humidifier Maintenance
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 dependent 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™ user manual SL-31075 for autoflush setup). To help reduce excessive scaling in locations
with difficult water quality, the use of Vapure™ is recommended (contact your local sales representative).
CAUTION: Risk of contact with extremely hot water and part surfaces. Can cause burn injury.
The infrared humidifier bulbs, metal enclosure, humidifier water, water reservoir pan and drain
tubing are very hot during and shortly after operation. Allow sufficient time for these parts to
cool to a touch-safe temperature before handling. Use extreme caution, and wear appropriate,
OSHA-approved PPE when performing maintenance on the infrared humidifier.
10.3.1 Cleaning Humidifier Pan and Float Switch
Before turning the unit Off:
1. With unit operating, remove call for humidification at the Liebert® iCOM control.
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 Liebert® iCOM control.
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 10.11 on the
next page).
14. Reinstall the pan, thermostat, standpipe, drain coupling and screws into the humidifier.
15. Operate the humidifier and check for leaks.
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