Vertiv Liebert iCOM User Manual

5 U2U Networking
Vertiv™ Liebert® iCOM™-controlled thermal management units connected in an Ethernet unit to unit (U2U) network are able
to efficiently cool and control humidity in the conditioned space by exchanging data in several modes of operation.
U2U networking is required to set up and control the following operating features:
• Teamwork
• Standby (lead/lag)
• Rotation
• Cascading
NOTE: The U2U network must be separate from other networks. Use a communication card, such as a Vertiv™ Liebert®
IntelliSlot™ Unity, to communicate securely between your building-management system or other networks.
5.1 Preparing for U2U Group Set Up
Cooling units in the network will be assigned to groups, which affects how units function in teamwork, standby, rotation, and
cascading operations. Especially in large rooms, it is important to consider several factors before setting up groups to balance
cooling unit operation with room conditions.
NOTE: For ease of set-up and use, we recommend using only one group unless you have multiple rooms, differing
software versions, or different types of cooling units.
1. Make a map of the room and indicate the location of all heat-generating devices and cooling units to plan for
proper heat load management and cooling-air distribution.
2. Note the type of units by product/model, size, etc.
3. Determine the number of units to network together to ensure proper air flow and environmental control, up to 32
units.
4. Determine number of standby units.
5. Determine if using teamwork and if so, which mode.
6. Plan U2U address assignments.
• Refer to the U2U Control Board Settings on page99 , for guidelines assigning cooling unit control board
addresses.
• Balance/Alternate unit address assignments based on room layout and because standby and teamwork
operate in numeric order by unit number. Figure 5.1 on the next page , shows an example layout
assignment with half of the cooling units in standby and half operating. Without a plan, adjacent units
could be operating or inactive, which may not provide proper heat-load balance or efficient use of cooling
capacity.
7. Read and record all programmed settings for each of the individual units (see Backing Up and Restoring Control
Board Settings on page163 ).
8. Verify that network cabling and switches are provided, ready to connect, and labeled by unit at the network
switch.
NOTE: Cooling units are factory-wired for stand alone operation. Do not connect the U2U network cabling before
setting the U2U network configuration/groups. Network communication conflicts and unreliable display readings will
result. Configure the network using Configuring U2U Network Settings on the next page , then refer to U2U Wiring
Connections on page197 , to connect the network cabling and hardware.
5 U2U Networking
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Vertiv™ Liebert® iCOM™Installer/User Guide

Vertiv Liebert iCOM Specifications

General

Brand	Vertiv
Model	Liebert iCOM
Category	Control Unit
Language	English