Installing the VVT Bypass Controller
VVT Bypass Controller
Carrier Proprietary and Confidential
CARRIER CORPORATION ©2017
Installation and Start-up Guide
All rights reserved
11
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
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
BACnet
MS/TP
Baud
diagram on the controller.
NOTE
Use the same baud rate for all controllers on the network segment.
5
If the VVT Bypass Controller is at either end of a network segment, connect a BT485 to the VVT Bypass
Controller.
6
Insert the power screw terminal connector into the VVT Bypass Controller's power terminals.
7
Verify communication with the network by viewing a Module Status report in the WebCTRL® interface.