Maintenance
137
Figure 100Correct orientation of float switch
13.4.2 Changing Humidifier Lamps
1. Remove humidifier pan (see 13.4.1 - Cleaning Humidifier Pan and Float Switch, 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.
Figure 101Infrared 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.
Correct Switch Orientation
Incorrect Switch Orientation
DPN000996
Rev. 0
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