Product Introduction; Product Appearance - Emerson Liebert PEX Series User Manual

2 Chapter 1 Overview

1.2 Product Introduction

The Liebert.PEX series air conditioner is a medium-large sized precision environment control system, which is suitable
for the environment control of the equipment room or computer room. It aims to provide a sound operating
environment for precision equipment, such as sensitive equipment, industry processing equipment, communication
equipment and computers.
The Liebert.PEX series air conditioner features high reliability, high sensible heat ratio and large airflow. It is
configured with an infrared humidifier adjustable to different water qualities, and is compatible with R407C green
refrigerant to meet the international requirement.
The unit is classified into dual cooling system, single source cooling system and free cool system in the light of the
function module. All kinds of different function systems can use the forward centrifugal curved fan (FC fan for short)
and the speed adjustable DC electronically commutated fan (EC fan for short).
Dual cooling system
The unit contains the compressor refrigerating system and the chilled-water system. The control board can select
whether to run under the compressor refrigerating system or the chilled-water system flexibly according to the
connected chilled-water condition and the indoor load, so as to achieve the energy-saving operation of the unit.
Single source cooling system
The unit contains the compressor refrigerating system only.
Free cool system
The unit contains the compressor refrigerating system and the free cool system. Free cool system can be connected
with the special dry cooler. Under the conditions of the low outdoor temperature, the unit can select whether to run
under the compressor refrigerating system or the free cool system flexibly according to the free cool medium condition
provided by dry cooler and the indoor load, so as to achieve the energy-saving operation of the unit. According to the
cooling mode of the refrigerant side, the unit contains the air-cooled series and the water-cooled series.
Air-cooled series
The Liebert.PEX air-cooled series air conditioner comprises indoor unit and outdoor unit. With the standard
configuration of Liebert.PEX condenser unit, it can reduce noise pollution to the minimum while meeting system
cooling requirement through the pressure regulating the fan speed. The Liebert.PEX low temperature CS (D) F_S
series outdoor unit can also be configured for it, qualifying the system to normally operate in cooling mode at the
temperature down to -84.2°F. Please consult Emerson Network Power Co., Ltd. (Emerson for short) if the lower
temperature is required.
Water-cooled series
The Liebert.PEX water-cooled series air conditioner uses integrated structure and highly effective brazed-plate heat
exchanger (BPHE), thus it is compact, efficient and quiet.

1.3 Product Appearance

Taking the two-bay unit of FC fan for example, the appearance of the Liebert.PEX series air conditioner is shown in
Figure 1-2.
Upflow
上出风
Figure 1-2 Appearance (two-bay unit)
Liebert.PEX2 Series Air Conditioner User Manual
Downflow
下出风