Operation; Single Unit Functions; Unit/Fan Control; Figure 11 Start-Stop Priority Switches - Emerson Liebert Challenger 3000 User Manual

3.0 O
PERATION
The Liebert iCOM display provides viewing, trending and configuration capability for Liebert cooling
units. All unit settings and parameters can be viewed and adjusted through three menus: User, Ser-
vice and Advanced. All active alarms are displayed on the LCD and annunciated.
The control is shipped from the factory with default selections for all necessary settings. Adjustments
can be made if the defaults do not meet your requirements.
References to menu items in this manual are followed by the main menu and the submenu where they
can be found.
For example:
• Temperature Setpoint (User Menu, Setpoints) - The Temperature Setpoint parameter is
located in the User menu under the Setpoints submenu.
• High Return Humidity (Service Menu, Set Alarms) - The High Return Humidity alarm is
located in the Service menu under the Set Alarms submenu.
3.1

Single Unit Functions

3.1.1

Unit/Fan Control

Start - Stop
Unit on means the fan output is activated. The unit can be switched On and Off from two inputs:
• Remote Off - Remote shutdown terminals will turn off the connected unit thus displaying remote
off on the front display. This command can also be invoked from a BMS.
• Display Off - When a unit is turned off from the System Screen of a large display, Display OFF is
shown for unit status.
• Local OFF - When a unit is turned off from the Unit Status Screen or small display, Local OFF is
shown for unit status.
Pressing the On/Off key on a small display will control only the cooling unit it is connected to regard-
less, of whether the cooling unit is a stand-alone unit or part of a network.
NOTE
Pressing the On/Off key on a large display of a stand-alone cooling unit will control
only that unit.
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.
NOTE
Customer switches: remote On/Off (if used) and display On/Off switches are in series. A
cooling unit will start only if both switches are On; if one of these switches is Off, the unit will
stop. Safety devices within the unit are also in series and will shut the unit down if required.

Figure 11 Start-stop priority switches

NOTE
If Remote On/Off is not used, a jumper is inserted to bypass the switch.
Display On / Off
Remote On / Off
12

Operation