Emerson Liebert iCOM Manual De Usuario

Pressing the On/Off key on a small display will affect only the cooling unit it is mounted on, 

regardless of whether the cooling unit is a stand-alone unit or part of a network. The small Liebert 

iCOM display does not have access to the Unit-to-Unit network.

The effect of pressing the On/Off key on a large display connected to a network depends on the view: 

System or Unit.

• In System view, pressing the On/Off key shows a warning asking for confirmation to shut down 

the entire system.

• In Unit view, pressing the On/Off key affects only the unit being viewed, without a confirmation 

request.

Each time a unit is powered On or Off, an event is added to the Event Log in the User menu.

When input power returns after a power failure, the unit will return to its previous operating status: 

On if it was On before the power failure, Off if it was Off. 
When power returns, the autorestart time—time-selectable: Single Unit Auto Restart (Service Menu, 

Options Setup)—will determine how quickly the unit restarts.

A Loss of Power Alarm is activated when power is restored after an interruption. If acknowledged, the 

alarm resets automatically after 30 minutes. This alarm can be set to different event types (Message, 

Alarm or Warning) and can be disabled under menu item Loss of Power (Service Menu, Set Alarms).

The fan operation is protected by two digital devices: motor protection (optional on VFD centrifugal 

and standard centrifugal drives) and a differential pressure switch. The motor protection monitors for 

main fan overload (Main Fan Overload alarm) or EC fan fault and the differential pressure switch 

detects a loss of airflow. If either protection device is activated after an adjustable time delay, an 

audible alarm occurs, an alarm relay activates and an event is recorded in the event log (Main Fan 

Overload or EC fan fault and Loss of Airflow in Service Menu > Set Alarms).
The fan delay at the unit start is always five seconds shorter than the control delay (to avoid short-

cycling components when the fan is not working).
When a main fan overload occurs, the main fan, cooling, heating, humidification and dehumidification 

are disabled to prevent equipment damage; the unit status will show “Alarm Off.” The unit will 

automatically resume operation once the overload condition has cleared.
When an EC fan fault occurs, the unit will continue to operate normally unless a loss of airflow alarm 

occurs.
When a loss of airflow occurs, the fan(s) will continue to operate to keep the unit on line until the 

problem is corrected. Cooling, heating, dehumidification and humidification are disabled.