aci BACnet AVERAGING Series Installation & Operation Instructions

BACnet / Modbus AVERAGING SERIES
Installation & Operation Instructions
GENERAL INFORMATION
The BACnet MS/TP / Modbus RTU Averaging Series
sensor is designed for use with electronic controllers
in commercial heating and cooling building manage-
ment systems. The ACI BACnet MS/TP / Modbus RTU
Averaging Series sensor monitor the average
temperature in commercial HVAC ductwork and
provides a better average temperature of the air
inside the duct compared to a single point duct
sensor. Averaging sensors are sold in either Copper
or Flexible Averaging variations.
Averaging sensors include a continuous sensing
element, which covers the entire length of the probe.
The Flexible Averaging sensor has either 4 or 9
sensing points depending on the length. It uses
BACnet MS/TP or Modbus for RTU for physical
connection to a BAS or controller, has dip switches to
set addresses and baud rate, parity and stop bits
(Modbus RTU only), and has on board end-of-line
termination. There is no analog output.
WIRING INSTRUCTIONS
The BACnet MS/TP /Modbus RTU Averaging Series
temperature sensor has a depluggable terminal
block located on the front of the PCB. For ease of
wiring, we recommend removing the block, wiring,
and reattaching before mounting. 16 to 22 AWG
two conductor shielded cable is recommended for
powering the sensors.
ACI recommends using Belden 3105 or compatible
cable for RS-485 communication wiring. This wire has
120 ohm input impendence. The terminal blocks
allow for (1) or (2) wires to be connected in each
position for daisy chaining. Daisy chain the RS-485
wiring and do not use "Star" or "T" wiring. Avoid
running communication wires next to AC line
voltage wires. These can be sources of noise that can
a ect signal quality.
Automation Components, Inc.
2305 Pleasant View Road | Middleton, WI 53562
Phone: 1-888-967-5224 | Website: workaci.com
FIGURE 1: ENCLOSURE
DIMENSIONS
The Copper
FIGURE 2: LAYOUT
Page 1
Phone: 1-888-967-5224
Website: workaci.com
3.60"
(91.44 mm)
2.25"
(57.15 mm)
END OF LINE
TERMINATION
TERMINAL
BLOCKS
V GN D- D+
SW4
2
1
BAC MOD
NET BUS
RESET
BUTTON
2.35"
(59.80 mm)
LED
EN DIS
64
32
16
8
4
2
1
4
2
1
Version: 2.0
I0000932