AC8
Product Specification/Installation Sheet
Description
The Liebert AC8 is ideal for coordinated control of systems
with redundant equipment, such as multiple environmental
units or pumps. When the AC8 controller detects an alarm in
an operating device, the AC8 enables a standby device and
controls the device in alarm as configured, either leaving that
device operating or disabling it.
The AC8 controller can also balance usage of devices by
rotating units through Operating and Standby modes
according to a user-defined schedule. This helps keep
redundant equipment operating efficiently and only when
needed. The AC8 can perform routine testing of standby
devices and alert personnel if a standby device fails an
operating test and requires attention.
The staging feature permits standby devices to be turned on
or off when a sensor detects specified levels. For example, the
AC8 might be configured to turn on a fan when the
temperature reaches 75°F, then turn on a second fan at 80°F.
When the temperature falls below 80°F, the second fan is turned off; when it drops below 75°F,
the first fan is turned off. Liebert’s TW420 Temperature Transmitter may be connected to any of
the four analog sensor inputs for staging and other functions.
Another capability of the AC8 is monitoring the status of connected devices and keeping
personnel apprised through local alarming. The AC8 employs local alarming and remote paging
services to keep personnel on-site and at remote locations apprised of the status of equipment.
The AC8 controller can interface with
anything that closes an electrical contact.
To improve process efficiency and
Features and Benefits
• Custom configuration for specific applications
• Paging capability—up to four pager numbers
• Preconfigured on-board modem
troubleshooting, the controller tracks data
in three types of logs: alarm, event and
trend.
The AC8 has both a local LCD interface
and a remote dial-up interface for
configuration and monitoring. Liebert’s
SiteScan Web may also be used for
monitoring, as well as some configuration
functions.
• Alarm, Event and Trend logs with time and
date stamp
• Battery backup to ensure alarm notification
• Backup and download configuration files
• User interface via RS232 or modem connection
• On-board audible alarm
When an alarm condition arises, the AC8
displays alarm information, sounds an
audible alarm, changes the state of the
common alarm relay and turns connected
devices on or off according to user
configuration. If configured, the controller
also sends pager notifications.
• Configuration data permanently stored in non-
volatile Electrically Erasable Programmable
Read Only Memory (EEPROM) for protection
against power loss
• Real-time clock
For other applications, contact your local
Liebert representative or call
1-800-222-5877.
• Status LEDs for verification and diagnostics
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Dimensions - Enclosure and Transformer Modules
18"
(457.2mm)
ENCLOSURE
TRANSFORMER MODULES (115V & 230V)
Front
view
Front
view
14"
(355.6mm)
18"
(457.2mm)
3.83"
(97.2mm)
2.85"
(72.39mm)
Top/bottom
view
Top/bottom
view
2.65"
(67.3mm)
Wiring Specifications
Connection
Supported Wire Type
Maximum Wire Length
Rating
18-22 AWG Stranded & Unshielded
18 AWG* (recommended)
Non Plenum - Belden 9740
Plenum - Belden 89740
Digital
Input/
EPOP
Dry Contact
(24VDC,
10 mA)
750 ft. (225m)
18 AWG*
20 AWG
22 AWG
Digital
Output/
Control
Relay
18-22 AWG Stranded & Unshielded
18 AWG* (recommended)
Non Plenum - Belden 9740
Plenum - Belden 89740
(recommended)
24VAC@3A
@3A 50 ft. (15m)
@3A 40 ft. (12m)
@3A 25 ft. (7m)
@2A 35 ft. (10m)
@2A 100 ft. (30m) @2A 60 ft. (18m)
@1A 200 ft. (60m) @1A 100 ft. (30m) @1A 75 ft. (23m)
18-22 AWG Stranded & Unshielded
18 AWG* (recommended)
Non Plenum - Belden 9740
Plenum - Belden 89740
4-20 mA Signal
Input Selectable
Power Source
(12/24VDC)
Analog Input
2-Wire
Transducer
750 ft. (225m)
18-22 AWG Stranded & Unshielded
18 AWG* (recommended)
Non Plenum - Belden 8489
Plenum - Belden 88489
4-20 mA Signal
Input Selectable
Power Source
(12/24VDC)
Analog Input
4-Wire
Transducer
750 ft. (225m)
18 AWG*
20 AWG
22 AWG
18-22 AWG Stranded & Unshielded
18 AWG* (recommended)
Non Plenum - Belden 9740
Plenum - Belden 89740
(recommended)
Common
Alarm
Output
24VAC
@3A
@3A 50 ft. (15m)
@3A 40 ft. (12m)
@3A 25 ft. (7m)
@2A 35 ft. (10m)
@2A 100 ft. (30m) @2A 60 ft. (18m)
@1A 200 ft. (60m) @1A 100 ft. (30m) @1A 75 ft. (23m)
Communication
RS232
Null Modem Cable
50 ft. (15m)
N/A
N/A
18-22 AWG Stranded & Shielded
22 AWG* (recommended)
Non Plenum - Belden 9461
Plenum - Belden 88761
Communication
EIA422
1000 ft. (300m)
SiteScan
18-22 AWG Stranded & Shielded
22 AWG* (recommended)
Non Plenum - Belden 9461
Plenum - Belden 88761
Communication
EIA485
3000 ft. (900m)
N/A
N/A
N/A
Phone/Modem
Line
4 Wire (Pins 3 & 4)
RJ11 Connector
18-22 AWG Stranded & Shielded
18 AWG* (recommended)
Non Plenum - Belden 8770
Plenum - Belden 88770
24VAC Power
Connection
(TB7)
24VAC
@1.3A
150 ft. (45m)
Power Connections (Transformer Module)
14 AWG Stranded & Unshielded
115VAC
115VAC
@4A
150 ft. (45m)
150 ft. (45m)
Non Plenum - Belden 5101UE
14 AWG Stranded & Unshielded
230VAC
230VAC
@0.5A
Non Plenum - Belden 5101UE
* Recommended
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AC8 Specifications
Power
Requirements
115VAC Transformer Module / UML11500
230VAC Transformer Module / UML23000
115VAC ±10% of nominal; 60Hz, 4A, 460VA 230VAC ±10% of nominal; 50Hz, 0.5A, 115VA
Dimensions: W x D x H, in. (mm)
Weight (Assembled)
Enclosure Type
18 x 2-3/4 x 18 (457.2 x 69.85 x 457.2)
20.56 lb. (9.33 kg)
NEMA 1
Liquid Crystal Display (LCD)
Mounting Surface
Ambient Operating Environment
Processor Specifics
Model
Four line, 20 character, backlit
Building Wall or Structural Member
32ºF to 104ºF (0ºC to 40ºC) 0% RH to 95% RH (non-condensing)
Motorola XC68HC812A4
Clock speed
16MHz
256Kb
Total RAM
Total FLASH
4M
Total EEPROM
4K
A/D Resolution (Analog IN)
Modem Type Embedded
Clock Type
12 Bit
14.4K bps
Real-Time Clock
Lithium Cell (non-replaceable)
7 years, constant, no power
Nickel Cadmium (replaceable)
10 minutes at full load
Clock battery backup type
Clock battery life
Modem battery backup type
Modem battery life
Communications
Local Communications
RS232
Remote: Modem (9600-N-8-1)
Remote: Supported pagers
Baud rate 9600 bps, Parity=None, Data bits=8, Stop bits=1
9600 E-7-1 supports TAPI protocol version 1.8
SiteScan Web
Agency Listings
UL
IGM Protocol, EIA422
115VAC Transformer Module (TM115)
230VAC Transformer Module (TM230)
UL1012
UL1585
CSA
C22.2 No. 66 and C22.2 No. 107.1
CE
Yes
N/A
FCC Compliance
Inputs & Outputs (Quantity)
Digital Inputs (8)
Analog Inputs (4)
Digital Outputs (8)
Common Alarm Outputs (2)
Dry Contact Closure 24VDC, 10 mA
4-20 mA signal input with selectable power source of 12VDC or 24VDC
24VAC, 3A
24VAC, 3A
Ordering Information
Quantity
Part #
Description
AC8 controller board & Transformer Module 115VAC with two 24VAC outputs (40VA each) and 115VAC
receptacle in enclosure
AC8L115
AC8L230
AC8 controller board & Transformer Module 230VAC with two 24VAC outputs (40VA each) in enclosure
201258P1 RS232 configuration cable
TW420 Temperature Transmitter Wall 4-20 mA @ 45°F to 96°F
Liebert Corporation
1050 Dearborn Drive
P.O. Box 29186
Columbus, OH 43229
Telephone: 1-800-877-9222
Facsimile: 1-614-841-6022
© 2005 Liebert Corporation
® Liebert and the Liebert logo are registered trademarks of
All rights reserved throughout the world. Specifications subject Liebert Corporation. All names referred to are trademarks or
to change without notice.
registered trademarks of their respective owners.
SL-31101 (12/05) Rev. 0
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