Vertiv Liebert MCV440 - Overview of Operating Modes

Figure 10.1 Vertiv™ Liebert® EconoPhase Pumped Refrigerant Pressure Enthalpy Diagram
Item Description Item Description
1 Pressure 6 Condenser (DX mode)
2 Enthalpy 7 Indoor unit
3 Liquid 8 Condenser (pump mode)
4 Liquid/vapor maximum 9 Traditional vapor compression cycle
5 Vapor 10 EconoPhase cycle
10.2 Overview of Operating Modes
Each circuit on a system combining a Vertiv™ Liebert® EconoPhase, Vertiv™ Liebert® DSE and Vertiv™ Liebert® MCV
condenser has six distinct operating modes:
• Idling with compressor and pumps Off
• Start-up
• Compressor operation
• Compressor to pump changeover
• Pump operation
• Pump to compressor changeover
34 Proprietary and Confidential ©2024 Vertiv Group Corp. 10 Control Operation
Vertiv™ Liebert® MCV Installer/User Guide