Emerson Liebert iCOM Manual De Usuario

The Liebert iCOM controller has the ability to operate EC fans at very low speed to effectively act as 

a back-draft damper. The power used to prevent air flow from entering a standby unit from the raised 

floor by spinning the fans at a low speed is much less expensive than the additional static that 

conventional mechanical dampers introduce while the unit is in operation.
Mechanical Fan Dampers

• No damper = Waste of efficiency, mixture of discharge and return
• Increase pressure drop during unit operation
• Up-front cost of mechanical dampers
• Increases unit height or adds complexity under floor

• Fans rotate at low speed to prevent air flow through unit
• Adjustable, based on application
• No pressure drop during unit operation
• No up-front cost as with mechanical dampers