Daikin Pathfinder AWV Installation, Operation And Maintenance Manual page 46

System Architecture
The overall controls architecture uses the following:
• One MicroTech III unit controller
®
• I/O extension modules (sometimes referred to as
"controllers") as needed depending on the configuration
of the unit
• Up to three BAS interface modules as needed based on
installed options
Figure 68: System Architecture Schematic
BAS Comm BAS Comm BAS Comm
Interface Interface Interface
Module Module Module
NOTE: Graphic shows typical chiller controller arrangement; individual chiller configurations will be as ordered.
IOM 1242-8 • PATHFINDER
Unit Controller
Peripheral Bus
Alarm/Limit Circuit 1
I/O Extension I/O Extension
DC Fan Controller
MODEL AWV CHILLERS
®
Modbus Communication - Unit
The unit controller (UC) communicates to the compressor
VFD's and the EXV modules via the Modbus RTU connection
on the controller itself. Communication to the VFD's and EVAP
EXV MODULE is required for operation in all configurations.
Communication to ECON EXV MODULE is required only if the
chiller is configured with economizers.
Compressor
VFD 1
Modbus
Evap EXV
Circuit 2 RapidRestore®
I/O Extension I/O Extension
DC
Fan
Modbus
46
Controller Operation
Compressor
VFD 2
Economizer EXV
Module Module
...
DC DC DC
Fan Fan Fan
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