Commissioning Instructions

8
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Hierarchical Grouping
All central AFs can be grouped hierarchically (except for Supply AFs where information
is bundled). A "Hierarchical Grouping" function is a group master that distributes infor-
mation to same-type subordinate AFs (group member). The central AFs contain all
BACnet objects required to be used as master or member.
Hierarchical grouping is used for different reasons:
• Network exceeds a maximum recommended length.
• Too many network members: For central functions, the max number is 500,
and 250 for supply functions.
Simplified engineering and commissioning suggestions:
• You can completely engineer a floor, test it, and then copy it.
• A "floor" can comprise multiple small physical floors or several tenant rooms in
a building.
• A “floor” can be comprised of DXRs on the same subnet.
The Central Operating Mode function provides a good example of hierarchical
grouping. CenOpMod sends commands from a central function (e.g. AHU) to
CenOpMod functions on different floors. This can be very useful when, for example,
multiple floors must be commanded from Comfort to Economy during the weekday
schedule change.