Vertiv | Liebert PEX4 | User Manual 5
Product Overview
Figure 1-2 Scroll Compressor
1.4.5. Oil Return Arrangement
The unit’s intelligent oil return logic allows the proper return of oil to the compressor during the part load
period. When the oil return adjustment is required, to maintain the running time of return oil, the compressor
sets the return oil running speed.
1.4.6. EMI Filter
The PEX4 unit comes with a built-in Electromagnetic Interference (EMI) lter to suppress the interference
which is generated by inverter drive system. EMI-lter conforms with class B standard and IEC No: EN55014-1.
1.4.7. Refrigeration Circuit
The refrigeration system is of the direct expansion type and includes one or two hermetic scroll compressors
(with inverter drive arrangement), equipped with crankcase heaters and rota-lock connections. The system
includes an auto reset high pressure control and low pressure control; also has EEV, high sensitivity refrigerant
sight glass, large capacity lter dryer with rota-lock connections and charging/access ports in each circuit. Each
circuit only connects to one compressor.
• Do not use inferior quality refrigerant.
• For any consequences resulting from inferior quality refrigerant, Vertiv does not assume warranty
responsibility.
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