A circuit will run most of the time in either compressor or pump operation mode. These modes both efficiently remove heat
from the conditioned space and reject it via the air cooled condenser. The flow paths during each mode of operation are
detailed in Compressorized Operation Flow Path below and Pump Operation Flow Path on the next page.
A couple of differences to note between Compressor Mode and Vertiv™ Liebert® EconoPhase operation:
• The unit does not dehumidify in Liebert® EconoPhase operation. If dehumidification is desired, Liebert®
EconoPhase operation must be disabled.
• Bubbles may be seen in the site glass in the indoor unit when the system is in Liebert® EconoPhase operation.
This does not necessarily mean the system is low on charge. Refer to the Liebert® DSE user manual (available at
www.Vertiv.com) for complete charging instructions for the Liebert® DSE/EconoPhase system.
Figure 10.2 Compressorized Operation Flow Path
Item Description Item Description
1 Check valve 5 Electronic expansion valve (EEV)
2 Condenser 6 Pump
3 Compressor 7 Solenoid valve
4 Evaporator
10 Control Operation Proprietary and Confidential ©2024 Vertiv Group Corp. 35
Vertiv™ Liebert® MCV Installer/User Guide
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