Vertiv | Liebert® DM | User Manual 95
System Operation and Maintenance
DM 22 kW/27 kW Upflow Unit DM 22 kW/27 kW Downflow Unit
No. Description
1 Electrical Heater
Figure 7-5 Location of Electrical Heater (22 kW and 27 kW)
7.2.5. Infrared Humidifier
During the normal operation of the infrared humidifier, mineral particles will be concentrated on the infrared humidifier
water pan. These deposits must be removed periodically to ensure eicient operation of the infrared humidifier. Due to the
dierent water sources, the cleaning time should be determined by each local region. It is recommended to check monthly
(cleaning if necessary). The automatic flushing function of the infrared humidifier itself extends the time interval between
cleanings, but regular inspections and maintenance are still essential.
Following are the cleaning steps:
1. Disconnect the infrared lamp power supply plug-in cable.
2. Drain the water in the infrared humidifier water pan and disconnect the drain pipe.
3. Remove the humidifier water pan fixing screw, tilt the rear end of the water pan upwards, loosen the rear side hook of the
water pan, then carefully remove the water pan, and do not touch the lamp.
4. Use a hard brush to remove the deposit from the infrared humidifier water pan.
5. Reverse the process to restore the humidifier water pan.
Before exercising the corresponding operation, ensure that the power supply has been switched o.
Ensure that the water in the water pan is close to room temperature before draining it to avoid personal
injury.
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