Vertiv Liebert PEX4 Series - 1.4.8. Electronic Expansion Valve (EEV); 1.4.9. Evaporator Coil

Vertiv | Liebert PEX4 | User Manual 6
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 ow and to precisely regulate the ow 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 ow tube evaporator is adopted, as shown in Figure 1-4. 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 upow unit and ‘A’ pattern
for downow unit.
Figure 1-4 Evaporator Coil