Figure 10.11 Correct float switch orientation
Item Description
1 Correct switch orientation
2 Incorrect switch orientation
10.3.2 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 10.12 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.
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.
9. Wrap lead wires once around new lamp’s metal ends. This will support lamp and allow for
thermal expansion. Insert lead wires into junction block and torque screws to 30 in-lb.
10. Reassemble by reversing steps 1 through 9.
Vertiv | Liebert® DSE™ Installer/User Guide
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