Emerson AC4 User Manual

The Liebert AC4 has four outputs that may be configured individually. These outputs correspond to 

the four numbered inputs. For example, Device_1 is the unit connected to Input 1 and to Output 1. 
The output name is the same as the input name, as described in 

7.3.1 Change Label (Name of Input).
To configure an output:

• From the Main Menu, use the arrows

↑↓

 to

 

choose System and 

Control, then press Enter ↵ (see 7.1 Login for help).

• Enter your password at the Login screen.
• From the System and Control Menu, use the arrows

↑↓

 to

 

choose 

Setup System, then press Enter ↵.

• From the Setup System Menu, shown at right, use the arrows

↑↓

 to

 

choose Setup Outputs and press Enter ↵.

• From the Select Output Menu, choose an output—for example, 

Device_1—and press Enter ↵.

Table 17 shows digital output features and their default settings: you 

may define an output as normally open or normally closed, set the device’s mode—operating, standby 

or not used—and specify whether to disable the device when an alarm occurs.
Use the steps following Table 17 to change the default settings for any digital output.

Each output may be set up as Normally Open (NO) or Normally Closed 

(NC). The default setting for all output points is NO (Normally Open).

• From the Setup Outputs Menu, shown at right, use the arrows

↑↓

 

to

 

choose Norm Open/Close and press Enter ↵.

• To change the normal state for this output, use the arrows

↑↓

 to

 

choose the state:

• NO (Normally Open)
• NC (Normally Closed)

• Press Enter ↵.

NORM OPEN/CLOSE

NO (Normally open)

NC (Normally closed)

MODE

Outputs 1-3:

Output 4:

OP (Operating)

ST (Standby)

OP (Operating)

ST (Standby)

NU (Not Used)

IN ALARM

E (Enable)

D (Disable)

SETUP INPUTS
SETUP COMMON ALARM
SETUP ZONES

↑↓=NEXT

↵

=SELECT

SETUP SYSTEM INFO
SETUP OPERATION 

SELECT OUTPUT

DEVICE_2  NO-ST-E

↑↓=NEXT

↵

=SELECT

DEVICE_3  NO-NU-D
DEVICE_4  NO-NU-D

SETUP DEVICE_1

MODE: OPERATING

↑↓=NEXT

↵

=SELECT

IN ALARM: ENABLE

SET TO NORMAL OPEN
OR NORMAL CLOSE? NO

↑↓=NO/NC

↵

=END