Installing the Zone Ctrl II
Zone Ctrl II and
VAV Zone II Secondary Duct Installation and Start-up Guide
CARRIER CORPORATION ©2019
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Wiring for communications
The Zone Ctrl II communicates using BACnet on the following types of network segments:
•
MS/TP communicating at 9600 bps, 19.2 kbps, 38.4 kbps, or 76.8 kbps
•
ARC156 communicating at 156 kbps
NOTE
For more networking details, see the
Open Controller Network Wiring Installation Guide
.
Wiring specifications for BACnet MS/TP and ARC156
Cable:
22 AWG or 24 AWG, low-capacitance, twisted, stranded, shielded copper wire
Maximum length:
2000 feet (610 meters)
WARNING
Do not apply line voltage (mains voltage) to the controller's ports and terminals.
To wire the controller to the BACnet network
WARNING
Attaching any ARCNET or MS/TP network to the
Act Net
port damages BT485s, DIAG485s, or
terminating resistors on that network.
1
Pull the screw terminal connector from the controller's power terminals labeled
Gnd
and
24 Vac
.
2
Check the communications wiring for shorts and grounds.
3
Connect the communications wiring to the controller’s screw terminals labeled
Net +
,
Net -
, and
Shield
.
NOTE
Use the same polarity throughout the network segment.
4
Set the communication type and baud rate.
For...
Set BACnet ARC156 or
MS/TP
jumper to...
Set DIP switches 1 and 2 to...
ARC156
ARC156
N/A. Baud rate will be 156 kbps regardless of
the DIP switch settings.
MS/TP
MS/TP
The appropriate baud rate. See the
MS/TP
Baud
diagram on the controller.
NOTE
Use the same baud rate for all controllers on the network segment.
