Correct Float Switch Orientation; Changing Humidifier Lamps - Vertiv Liebert CW Series Installer And User Manual

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 11.9 below).
14. Reinstall the pan, thermostat, standpipe, drain coupling and screws into the humidifier.
15. Operate the humidifier and check for leaks.
Figure 11.9 Correct float switch orientation

10.4.2 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 11.10 on the next page.
1. Remove humidifier pan (see
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.
5. Using a continuity meter, locate burned out lamp.
6. Remove lamp brackets under lamps.
7. Loosen two screws securing lamp lead wires to junction block.
8. Pull bulb straight down and discard.
10 Maintenance
Item Description
1 Correct switchorientation
2 Incorrect switchorientation
Cleaning Humidifier Pan and Float Switch on the previous page, steps 1 through
99