Liebert DS User Manual

1. Remove humidifier pan (see 12.3.2 - 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.

Check and clear obstructions in tubing during routine maintenance.

• Disconnect power to unit using disconnect switch.

• Check and clear obstructions in gravity lines leading to condensate pump.
• Remove sump and clean with a stiff nylon brush and flush with water. 
• Inspect and clear clogs in discharge check valve and float mechanism.
• Reassemble and check for leaks.

NOTE
Touching quartz lamps with bare hands will severely shorten bulb life. Skin oils create hot 

Risk of electric shock. Can cause injury or death.
The iCOM microprocessor does not isolate power from the unit, even in the “Unit Off” mode. 

Some internal components require and receive power even during the “unit off” mode of iCOM 

control.
Disconnect local and remote power supplies before working within.