Vertiv | Liebert PEX4 | User Manual 4
Product Overview
1.4. Components of PEX4 Model
1.4.1. Cabinet
The cabinet frame is constructed of 2.5 mm, 2.0 mm, and 1.2 mm folded galvanized steel. The exterior panels are
constructed of 1.2 mm zinc coated sheet steel and insulated with foam insulation. The cabinet is powder coated
in Charcoal Grey color and have a textured nish. The hinged front doors can be removed and include the
captive 1/4 turn fasteners. PEX4 cabinet is divided into two sections- power module and cooling module. Power
module is comprising of compressor (s) and control section.
1.4.2. Air Filter
The lter panels can be removed from the front of the unit. Filtration is provided by V/ A form and the dry
disposable media housed in a metal frame. The rated eiciency is in accordance with EU4/ MERV8 standards.
The unit is tted with a Filter Dierential Pressure Switch, which is connected to the microprocessor controller
to provide ‘Filter Clogged’ warning indication.
1.4.3. EC Fans
The unit is tted with one/ two direct-driven, high eiciency, single inlet, backward curved, centrifugal
‘plug’ type fan (s), with aluminum nozzle (s) and PP Plastic impeller (s). The fan motors are Electronically
Commutated (EC), IP54, with internal protection and speed regulation via controller signal. The fans is statically
and dynamically balanced. For down-ow applications, the EC fan is mounted within the raised oor for higher
energy eiciency. A minimum raised oor height of 450 mm is required.
1.4.4. Inverter Scroll Compressor
PEX4 indoor unit is equipped with one/two (depending on capacity - >60 kW– two) scroll compressor driven
by inverter. It has a wide speed range of 1000 RPM to 7200 RPM to help part load eiciency. The compressor
is charged with lubricating oil, designed for operating with green refrigerant i.e. R410a. Each compressor has an
internal motor protection and is mounted on vibration isolators. Wide range of 30% to 120% of rated capacity is
attained by the system.
PEX4 uses scroll compressor with inverter drive arrangement can adjust the speed according to the change of
refrigeration demand automatically, which greatly improves the overall energy eiciency of the system. Inverter
system has a drive arrangement, which is compact in size with built-in DC reactor, that supports large torque
under low speed with small torque ripple and speed control accuracy of ± 0.5%. It has high thermal reliability,
long service life and CE certication.
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