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NETWORKING
The DDC system is adaptable to a variety of
different network architectures and protocols. Each
controller has built-in protocol translation and can be
configured for operation on ARCnet156 or EIA-485
communication networks. See Appendix II for specific
controller specifications.
The DDC system can be connected to most 3rd party
building automation systems. Some systems may
require the use of special routers, interfaces, or other
network communication devices. LON systems require
a special adapter card that must be ordered with the
unit. Ethernet systems require an interface that can
be ordered with the unit or sourced from a networking
vendor.
The BACnet device instance number for the
controller is 24000 + the rotary address setting.
The default address for all Aztec DDC units is 16,
therefore the BACnet instance number is 24016.
The DDC controller will not function if the rotary
address setting is incorrect.
DDC SYSTEM DEFAULT SETTINGS
The following is a list of Aztec DDC controller defaults.
These are the default operating parameters set at the
factory prior to shipment.
Unit Configuration
ITEM
DEFAULT
RANGE
Unit Network Address
16
00 – 99 (rotary switches)
Unit Enable
OFF
AUTO – OFF – MANUAL
3rd Party Zone Temperature Control Enable
No
No – Yes
Supply Fan VFD Operation
As specified
1 = Supply Air Temperature Control,
2 = Building Pressure Control
Mixed Air Damper Operation
As specified
1 = Building Pressure Control,
2 = Mixed Air Temperature Control,
3 = % Outside Air Control
Control System
As specified
MRT (modulating room temperature
control) –
MDT (modulating discharge
temperature control)
Stage 2 Cooling Installed
As specified
No – Yes
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