Liebert AC8 Controller

Autochangeover controllers are ideal for coordinated control of systems with redundant data center infrastructure equipment, such as multiple environmental units or pumps. When the controller detects an alarm in an operating device, a standby device is enabled and the device in alarm is either disabled or left operating as configured.


Category: Tag:


  • Autochanger for up to eight cooling units.
  • LCD interface and a terminal interface, as well as interface to.
  • Liebert SiteScan Web.
  • Adjustable alarm delay before control after alarm (up to 99 minutes).
  • Device in alarm can be selected to disable (shutdown) or remain enabled (continue running) after changeover.
  • High and low analog (temperature) alarms.
  • Analog controlled staging of devices (temperature staging of units).
  • Power failure override.
  • Two Form C control relays activated by any digital or analog input.
  • Paging for up to four numbers.
  • Preconfigured onboard modem.
  • Battery backup.
  • User interface via RS232 or modem connection.



  • Ensures high availability of cooling through automatic centralized control of computer room critical equipment.
  • Simpilfies emergency switching and unit testing.
  • Balances system runtime to reduce cooling unit wear and tear.
  • User-friendly interface makes it easy to program.




Brief Information