User manual
Teamwork
Liebert
®
iCOM
®
76
4.0 TEAMWORK
Unit-2-Unit (U2U) communications via a private network will allow the following functions to be
placed into operation when the requirement exists. The user must install the correct hardware
(see 5.0 - Installing a Liebert iCOM Unit-to-Unit Network) and properly program the units for
the selected functionality.
The Liebert iCOM network can perform the following functions:
The Teamwork Mode functions allow for multiple stages of cooling/heating and
humidification/dehumidification. Teamwork Mode can be used to prevent environmental units from
“fighting,” where one environmental unit might be cooling while another unit is heating.
The Standby (Lead/Lag) function allows one or more units to be set as “Running” and “Standby” for
activation in case of an alarm. This function also allows the units to be programmed in a rotation to
help ensure “Standby” unit operation.
The Cascade Operation function allows additional units to be staged-on based on the temperature
or humidity requirement.
4.1 Compatibility With Previous Liebert iCOM Controls
Extensive upgrades to the Unit-to-Unit communication software prevent Liebert iCOM controls with
PA2.01.029.04R software from being compatible with Liebert iCOM controls that have earlier
versions of Liebert iCOM software. Liebert iCOM controls with PA2.01.029.04R software will not
communicate with Liebert iCOM controls with PA1.XX.XXXSTD software.
Customers who have Liebert iCOM controls with the PA1.XX.XXXSTD software and who need
additional Liebert iCOM units can:
• Purchase new units with the previous software installed at the factory
• Purchase new units with the PA2.01.029.04R software and have a properly trained and qualified
technician downgrade the units to PA1.04.043.STD
• Have a properly trained and qualified technician upgrade the older unit(s) with PA2.01.029.03R
For further information, contact your local Emerson representative.
4.2 Teamwork Modes
Groups of cooling units connected to a network can be set up to work together in any of these
teamwork modes:
•No Teamwork
• Teamwork Mode 1
• Teamwork Mode 2
• Teamwork Mode 3 (software Rev. PA2.00.05R or higher required)
All Liebert iCOM-controlled cooling units on a network must be set to run in the same teamwork
mode.
4.2.1 Application of Teamwork Modes
All units in a network will run in the same Teamwork Mode.
• No Teamwork: Multiple zones in one room
• Teamwork Mode 1: Balanced load (small groups of units inside the same environment)
• Teamwork Mode 2: Unbalanced load (large rooms, not all units will have the same load) (work
well for most applications)
• Teamwork Mode 3: Allows the cooling capacity (Supply Sensor) to operate as a local control by
removing only the amount of load required to maintain the discharge air temperature at each
unit. This allows for an unbalanced room load while maintaining a consistent discharge air
temperature. The fan speed is controlled by the remote rack sensors (return, supply, under floor
static pressure) of all units, providing a controlled delivery method of the air to the cold aisle. In
raised floor applications, Liebert iCOM units will share sensor information to achieve even
under-floor air distribution. This distribution is achieved by operating all fans in parallel, which
will also yield the greatest energy efficiency.