Vertiv | Liebert PEX4 | User Manual 1
Product Overview
Chapter 1: Product Overview
1.1. Product Introduction
Liebert PEX4 series air conditioning is a medium and large-scale precision environmental control system, with
high reliability, high sensible heat ratio and with high energy eiciency ratio, suitable for equipment room or
computer room environment. It is designed to ensure a reasonable operating environment for critical system
such as sensitive equipment, industrial process equipment, communications equipment and servers.
Liebert PEX4 series air conditioning includes 10 models of cooling unit (35 kW, 45 kW, 50 kW, 60 kW, 70 kW, 80
kW, 90 kW, 100 kW 110 kW, 120 kW). These models are available in both upow and downow congurations
which are further dierentiated as small cooling capacity (35 kW, 45 kW, 50 kW, 60 kW) with variable frequency
drive single compressor and large cooling capacity units (70 kW, 80 kW, 90 kW, 100 kW, 110 kW, 120 kW)
with two variable frequency compressors. To improve further eiciency of the conguration, EC fan and
Electronic Expansion Valve (EEV) are the standard options. PEX4 also uses micro-channel evaporator, standard
distribution air supply temperature sensor, but heating and humidication are optional. The optional humidier
(infrared or electrode) is available according to dierent requirements.
The PEX4 unit is compatible to both at and ‘V’ type outdoor unit. Outdoor unit has pressure regulating fan
speed to meet the system cooling demand. It improves the operational reliability of the system and also results
in minimal noise pollution. In case of high-temperature applications, PEX4 can also be available with an optional
LVC condenser spray device to meet the cooling requirements of the data center or equipment room or similar
ecosystem.
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