Emerson AC4 User Manual

At any time, you may restore all default values for settings in the 

Liebert AC4 as it was shipped.

The password is the sole exception when reverting to the factory 

default settings. The password can be reset to the factory default of 

AAAA through the DIP switches. For details, see Change 

This function, which may be performed only through the Service Terminal Interface, upgrades the 

Liebert AC4’s firmware to the newest version.

• Connect to the Liebert AC4 either from a remote computer or through the RS232 port (see 

• At the Main Menu, enter 0 (zero—Setup System-Login Required).
• At the Login Menu, enter your password.
• At the Setup Menu, enter 5 (Setup System Information).
• At the Setup System Info menu, enter 6 (Perform Firmware Update).
• At the Perform Firmware Update menu, shown below, enter 1 to proceed with an update.

NOTE
This action will overwrite any configuration settings. You may 

(Service Terminal Interface only) in A.6.5 - Setup System 

Info for details on backing up settings using the Service 

NOTE
This action will overwrite any configuration settings. You may want to back up your settings 

Terminal Interface only) in A.6.5 - Setup System Info for details on backing up settings 

PERFORM FIRMWARE UPDATE

This command will update
the existing firmware

1=PERFORM FIRMWARE UPDATE
2=RETURN TO SETUP SYSTEM INFO MENU
3=RETURN TO SETUP MENU
4=RETURN TO MAIN MENU

SELECT A NUMBER:1

SETUP SYSTEM INFO

CHANGE PASSWORD
SET DATE & TIME

↑↓=NEXT

↵

=SELECT

SETUP SITE ID

RESTORE ALL DEFAULTS
ARE YOU SURE? N

↑↓=Y/N

↵

=END