Commissioning Instructions

13
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Central Functions
Central Functions Basics
The Central Function Application or Coordinator is implemented through the use of a
DXR2E/M.18 controller. Central Functions coordinate the actions of the room controller
to the primary plant. A DXR running the Central Function Application facilitates group
data exchange between room applications or DXRs and the primary plant controller or
Field Panel. It does this by using group member and group master objects to
communicate with RA Applications and by using ordinary BACnet objects to
communicate with the primary application. This avoids the need to field-configure
BACnet object references in the Field Panel.
Central Functions and Group Data Exchange are not mandatory because the
controllers support the read/write of standard BACnet Objects as we currently use
them.
One Central Function DXR can collect up to 250 Group Member objects. It can
read and write to those objects, as well as read and write using BACnet objects
from the Field Panel.
More than one group may be required depending on the size of the application, as only
one central function DXR should be used per AHU.
If there is more than one group, the group number can be changed in ABT Site under
the Central Functions task. The first group will have a default Group Number of 1, and
subsequent Group Numbers can be changed as necessary. See Configuration Group
Members and Masters for a detailed look at Group Member assignment.
There are multiple applications for Central Functions that can be used in a variety of
ways including:
• Start/stop coordination
• Minimizing Duct Pressure
• Optimizing Supply Air Temperature
• Controlling scheduling modes (Warm-up, Cool Down, etc.)
• Optimizing hot and/or chilled water parameters (supply temperature, start/stop
modes)