Unit To Unit Networking; Preparing For U2U Group Set Up - Vertiv Liebert iCOM DP400/500 Installer/User Manual

5 UNIT TO UNIT NETWORKING

NOTE: Your Liebert® DSE™ Packaged Solution does not offer humidification or dehumidification functions. Please
disregard those settings/fields when mentioned in this guide or displayed on the iCOM controller.
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
• Stand-by (lead/lag)
• Rotation
• Cascading
NOTE: The U2U network must be separate from other networks. Use a communication card, such as a 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
control-board addresses and iCOM display 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 stand-by 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.
5 Unit to Unit Networking
U2U Display and Control Board Settings on page 59, for guidelines assigning cooling-unit
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