Chapter 1 Overview 3
New Liebert_DM Series Air Conditioner User Manual
Low-temperature unit
Make the AC unit operate in cooling mode normally at the lowest outdoor temperature of -34°C.
1.5 Options
1.5.1 Humidifier
The humidifier can add pure water vapor (up to 2.5 kg/hour) into the room to control the indoor humidity within ranges
required by devices and computer.
The humidifier consists of a steam canister with automatic flushing control function, inlet tube, drain tube, solenoid
valve and steam distributor.
Note
1. The electrode humidifier should be installed and tested in factory.
2. The Liebert_DM AC can control the ambient humidity only after a humidifier is installed.
1.5.2 Heater
A ceramic heater with positive temperature coefficient can be selected. It is safe and reliable. When the surface
temperature is too high, it will reduce the heating power to avoid danger caused by over-temperature. A temperature
switch is provided on the surface of the heater, and it will cut off the power of the heater when the surface
temperature is too high. When the surface temperature decreases to normal, the temperature switch will restore the
operation of the heater automatically.
1.5.3 Remote Monitor
The Liebert_DM AC communicates with the host computer through a configured RS485 port and receives the control
of the host software. You can also select and configure a monitoring card to realize different monitoring functions. For
the descriptions of the host monitoring software RDU-Cooling developed by Emerson, refer to
Appendix 3 RDU-Cooling Air-Conditioner Single-Unit Manager Software Introduction.
1.5.4 Energy-Saving Card
The Liebert_DM AC can monitor the maximum room temperature with the energy-saving card located outside the unit
cabinet. The card is placed in position with high heat load and temperature. Up to four cards can be used for an AC
unit. When the temperatures measured by all energy-saving cards are lower than the setpoint in ‘Sleep Mod’ and only
indoor fan is running, if the ‘Sleep Mod’ is set to ‘ENAB’, the AC unit will turn off the indoor fan and enter the sleep
mode for saving the energy.
1.5.5 Power SPD
The power SPD is used for second level (C level) lightning over-voltage protection of the AC power. It can be
maintained easily and provides status indicating and alarm function.
Note
The humidifier, heater and power SPD should be installed in factory.
1.6 Ambient Requirements
1.6.1 Operation Environment
The operation environment requirements are listed in Table 1-2.
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