Emerson AC4 User Manual

The Liebert AC4 has a built-in real-time clock that is backed up by an encapsulated lithium battery 

and set up to adjust automatically for daylight saving time twice a year. The Setup System Info menu 

allows you to set the current date or time or change the automatic adjustment at any time.
To change the daylight saving time setting or to set the current date 

or time:

• From the Setup System Info Menu, use the arrows

↑↓

 to

 

choose 

Set Date & Time, then press Enter ↵.

• To change the daylight saving time setting:

• To the right of Daylight Svg Time, use the arrows

↑↓

 to 

choose Y (Yes - automatically adjust for daylight saving time) 

or N (No), then press Enter ↵.

• The format of the date and time is DD-MMM-YY HR:MM:SS. To 

set the current date or time:

• Press Enter ↵ to advance to the next character position you 

want to change.

• Use the arrows

↑↓

 to

 

choose from available entries:

• Press Enter ↵ to advance to the next character position.
• When finished, press Enter ↵ again.

You may enter a Site ID to identify the Liebert AC4’s location, using a 

name that may consist of up to 40 characters (see Table 12 for valid 

characters). The Site ID will appear with each alarm.
To enter or change the Site ID:

• From the Setup System Info Menu, use the arrows

↑↓

 to

 

choose 

Setup Site ID, then press Enter ↵.

• To enter a Site ID:

• Use the arrows

↑↓

 to

 

choose a character.

• Press Enter ↵ to advance to the next character position.
• If the Site ID is less than 40 characters, you may enter an 

underscore (_) character to indicate the end of the name.

• When finished, press Enter ↵ again.

Date Day (DD)

0-31

Month (MMM) JAN-DEC
Year (YY)

00-99

Time Hour (HR)

00-23

Minutes (MM) 00-59
Seconds (SS) 00-59

SETUP SYSTEM INFO

CHANGE PASSWORD

↑↓=NEXT

↵

=SELECT

SETUP SITE ID
FACTORY DEFAULTS

SET DATE & TIME

DAYLIGHT SVG TIME: Y

18-MAY-04 10:56:30

↑↓=SELECT 

↵

=NEXT/END

SETUP SYSTEM INFO

CHANGE PASSWORD
SET DATE & TIME

↑↓=NEXT

↵

=SELECT

FACTORY DEFAULTS

SETUP SITE ID

↑↓=SELECT 

↵

=NEXT/END