7 Configuring Economizer Operation
Use Vertiv™ Liebert® iCOM™ to configure the economizer installed on your cooling unit.
NOTE: Depending on customization to your cooling system, one of two types of economizer may be installed: the
Liebert® Fluid Economizer or the Liebert® Air Economizer. Menu options differ depending on the type of economizer
installed and significant differences are noted when they occur.
7.1 Fluid Economizers
Fluid economizers provide a secondary chilled water or glycol coil (Vertiv™ Liebert® Econ-o-Coil) for cooling. Economizer
operation is commonly referred to as free cooling because it reduces or eliminates the use of the compressor(s) in the right
environmental conditions.
Your system may have one of two kinds of fluid economizers:
• GLYCOOL Economizer:A two pipe system that feeds a second glycol coil in the cooling unit and also the
compressor(s) and heat exchanger (Liebert Paradenser™, tube-in-tube condenser, or brazed-plate heat
exchanger).
• Dual Cool Economizer: A two pipe or four pipe system.
• A two pipe system provides chilled water to a second coil, bypassing the air cooled/condenser
compressorized loop.
• In a four pipe system, two fluid lines are dedicated to a second chilled water coil and two fluid lines are
dedicated to a glycol cooled or chilled water cooled compressorized loop.
The fluid economizer option appears on the Vertiv™ Liebert® iCOM™ service menu and opens the FLUID ECONOMIZER panel
to configure operation.
7.1.1 Fluid Economizer Control Options
Override
Configures cooling unit override of economizer operation. See Overriding the Fluid Economizer Operation on the next
page .
Setup
Configures the activation setpoints of the economizer. See Setting Up Fluid Economizer Operation on the next page .
Status
Status of economizer properties. See Viewing Fluid Economizer Statuses on page115 .
7 Configuring Economizer Operation
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Vertiv™ Liebert® iCOM™Installer/User Guide
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