Figure 10.3 Pump 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
10.3 Vertiv™ Liebert® EconoPhase Operation
The Liebert® EconoPhase unit enables the Vertiv™ Liebert® DSE system to operate in any of threemodes to control
temperature, depending on the outdoor temperature and the load.
• Compressor Mode
• Pump Mode
• Mixed Mode
When the outdoor temperature becomes low enough to provide the required temperature difference between the inside air
and the outside air, there is no need to compress the refrigerant to a higher pressure/temperature. When the outdoor
temperature is low enough, the system switches from Compressor Mode to Pump Mode or to Mixed Mode.
• Compressor Mode: All available compressors may be used to maintain the control temperature. All the available
Liebert® EconoPhase pumps are Off. The control will typically run in this mode when the load and temperatures
are such that full or partial Liebert® EconoPhase operation is not possible, or because certain pumps have
experienced alarms.
• Pump Mode: All of the available pumps may be used to maintain the Control Temperature. All the compressors in
the system are Off. The control will typically run in this mode when load and temperatures permit.
• Mixed Mode: (Dual pump models only): The pump in Circuit 1 is On and the compressor(s) in Circuit 2 is On.
Some systems may not have Mixed Mode capability, depending on the manufacture date. Contact the factory to
inquire about a software upgrade.
36 Proprietary and Confidential ©2024 Vertiv Group Corp. 10 Control Operation
Vertiv™ Liebert® MCV Installer/User Guide
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