Chapter 1 Overview; Model Description; Product Introduction; Basic Performance Parameters - Liebert DM Series User Manual

This chapter introduces the model description, product introduction, basic performance parameters, main
components, options and ambient requirement, and refrigerant charging requirement of the new Liebert_DM series
air conditioner (Liebert_DM AC for short).

1.1 Model Description

The model description of the Liebert_DM AC is shown in Figure 1-1.
DM E 07 M

1.2 Product Introduction

The Liebert_DM AC is a small precise environment control system, specially designed for cooling the electrical
devices. It is applicable to environment control in equipment room and computer room. Featuring high reliability, it can
maintain a favorable running environment for precise devices such as sensitive devices, industry process devices,
communication devices and computers.
The cooling kit is provided as standard and it can precisely control the ambient temperature. The heater and
humidifier are provided as options and they can precisely control the ambient humidity. If the AC unit is only used for
cooling, the options are not needed.
The Liebert_DM AC provides a micro-processing controller that can automatically switch over to the required function
(cooling or heating, dehumidifying or humidifying), based on the programmed setpoints and room ambient conditions.
Each Liebert_DM AC consists of an indoor unit and an outdoor unit. Both units are installed on the floor separately.
Indoor unit
The Liebert_DM AC includes units with a cooling capacity of 7.5kW and 12.5kW, which are applicable to power
supply of 380V, 3-ph. You can select them according to the actual equipment room conditions.
Outdoor unit
The outdoor unit adopts air cooled mode. It is classified into two models: standard model and Lee-Temp model. The
Lee-Temp model can be used at lower temperature (see Table 1-1) than the standard model.

1.3 Basic Performance Parameters

The basic performance parameters of the Liebert_DM AC are given in Table 1-1.
Model
DME07M**1
DME12M**1
DME07M**2
DME12M**2

Chapter 1 Overview

C T 1
Figure 1-1 Model description
Table 1-1 Basic performance parameters
Nominal refrigeration
Power（kW）
capacity (kW)
7.5
12.5
7.5
12.5
New Liebert_DM Series Air Conditioner User Manual
1: Standard; 2: High efficiency
Client code
C: cooling only; O: with heater; H: with heater and humidifier
Input power supply. M: 380V-3-ph-50Hz
Cooling capacity. 07: 7.5kW; 12: 12.5kW
E: indoor unit; C: outdoor unit; L: Lee-Temp outdoor unit
Liebert_DM series air conditioner
Energy efficiency
rate
2.5 3.0
4.15 3.0
2.34 3.2
3.9 3.2
Chapter 1 Overview
[1]
Heating capacity Humidification
(kW) capacity
3.2
3.2
3.2
3.2
1
[2]
(kg/h)
2.5
2.5
2.5
2.5