Vertiv | Liebert PEX4 | User Manual
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Product Overview
1.4.8. Electronic Expansion Valve (EEV)
Each circuit has two EEVs for better refrigerant distribution with a common drive to control both valves.
The EEV is designed to collect temperature and pressure signals simultaneously to accurately modulate the
refrigerant mass flow and to precisely regulate the flow of refrigerant. EEV has a wide operating envelope, also
reduces the condensing pressure, thereby resulting in substantial energy savings. EEV also helps in maintaining
constant superheat.
Figure 1-3 Electronic Expansion Valve
1.4.9. Evaporator Coil
In PEX4 series parallel flow tube evaporator is adopted, as shown in
. It uses aluminum material that
reduces the weight of the evaporator and also reduces the copper consumption. At the same time, the design
of the micro-channel greatly reduces the refrigerant charge amount and enhances heat transfer, optimizes the
air bypass. Each cooling module consists of two separate evaporators, ‘V’ pattern for upflow unit and ‘A’ pattern
for downflow unit.
Figure 1-4 Evaporator Coil
