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 9.8 below).
14. Reinstall the pan, thermostat, standpipe, drain coupling and screws into the humidifier.
15. Operate the humidifier and check for leaks.
Figure 9.8 Correct float switch orientation
Item Description
1 Correct switch orientation
2 Incorrect switch orientation
9.3.2 Changing Humidifier Lamps
NOTE: Touching quartz lamps with bare hands will severely shorten bulb life. Skin oils create hot spots
on lamp surface. Wear clean cotton gloves when handling lamps.
The lamps are shown in Figure 9.9 on the facing page.
1. Remove humidifier pan (see Cleaning Humidifier Pan and Float Switch on the previous page,
steps 1 through 10).
2. Disconnect power from unit.
3. At humidifier, remove screws and cover from high-voltage compartment.
4. Disconnect one end of purple jumper wires.
Vertiv | Liebert® PDX™ and PCW™ Installer/User Guide | 74
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