Liebert AC4 User Manual

3 WIRING AND CONNECTIONS
WARNING! Risk of electric shock. Can cause property damage, injury and death.
Switch Off electric power to the Liebert AC4 before installing any wiring to the unit or changing
input or output connections. The Power On/Off switch is in the top left corner of the unit.
3.1 Wiring Specifications
Input and output connections to the Liebert AC4 may be made in any order—it is not necessary, for
example, to make all input connections before making any output connections. Use copper conductors
only for all wiring.
Connection Supported Wire Type Maximum Wire Length Rating
Digital
Input
18-22 AWG Stranded & Unshielded
18 AWG* (recommended)
Non Plenum - Belden 9740
Plenum - Belden 89740
750 ft. (225m)
Dry Contact
(24VDC,
10mA)
Digital
Output
18-22 AWG Stranded & Unshielded
18 AWG* (recommended)
Non Plenum - Belden 9740
Plenum - Belden 89740
18 AWG*
(recommended)
20 AWG 22 AWG
24VAC @3A
@3A 50 ft. (15m)
@2A 100 ft.
(30m)
@1A 200 ft.
(60m)
@3A 40 ft.
(12m)
@2A 60 ft.
(18m)
@1A 100 ft.
(30m)
@3A 25 ft.
(7m)
@2A 35 ft.
(10m)
@1A 75 ft.
(23m)
Common
Alarm
Output
18-22 AWG Stranded & Unshielded
18 AWG* (recommended)
Non Plenum - Belden 9740
Plenum - Belden 89740
18 AWG*
(recommended)
20 AWG 22 AWG
24VAC @3A
@3A 50 ft. (15m)
@2A 100 ft.
(30m)
@1A 200 ft.
(60m)
@3A 40 ft.
(12m)
@2A 60 ft.
(18m)
@1A 100 ft.
(30m)
@3A 25 ft.
(7m)
@2A 35 ft.
(10m)
@1A 75 ft.
(23m)
Communication
RS232
Null Modem Cable 50 ft. (15m) N/A
24VAC Power
Connection
(TB7)
18-22 AWG Stranded & Shielded
18 AWG* (recommended)
Non Plenum - Belden 8770
Plenum - Belden 88770
150 ft. (45m) 24VAC @1.3A
* Recommended
Table 3.1 Wiring specifications
Vertiv | Liebert® AC4 User Manual | 21

Liebert AC4 Specifications

General

Brand	Liebert
Model	AC4
Category	Control Unit
Language	English