aci DUCT Series Manual

DUCT SERIES

Installation & Operation Instructions

Phone: [phone]

Website: workaci.com

PRECAUTIONS

• DO NOT RUN THE WIRING IN ANY CONDUIT
WITH LINE VOLTAGE (24/120/230 VAC).

GENERAL INFORMATION

The Duct sensor is a single point temperature
sensor that is designed for use with electronic
controllers in commercial heating and cooling
building management systems. It is available
with multiple thermistor or RTD options.

For optimal temperature readings, follow these
tips:

• Duct probe should be placed (3) to (4) duct segments

down from any bend or obstructions and away from
90° bends.

• Mount the sensor on the top or sides of duct work;
mounting on the bottom risks damage due to
moisture.

• The sensor should be mounted in the middle of the
duct where air circulation is well mixed (no
stratication), and not blocked by obstructions.
Stratication and obstructions can cause sensing
errors. An example is downstream from a heating or
cooling coil.

FIGURE 1: ENCLOSURE
DIMENSIONS

4.79"

(121.55 mm)

(106.68 mm)

2.35"

(59.80 mm)

(45.18 mm)

2.34"

(59.38 mm)

1.78"

PLASTIC BOX (-PB)

3.60"

(91.44 mm)

2.25"

(57.15 mm)

GALVANIZED ENCLOSURE (-GD)

3.88"

(98.60 mm)

2.41"

(61.21 mm)

4.20"

BELL BOX (-BB)

2.95"

(75.00 mm)

MOUNTING INSTRUCTIONS

Drill a 3/8” hole in the duct and insert the probe through
the hole until the foam pad is tight to the duct. Drill pilot
holes for the (2) mounting screws. Use the enclosure
ange as a guide, or use the dimensions listed below to
measure out.

WITHOUT BOX (-DO)

0.61"

3.88"

(98.60 mm)

(24.89 mm)

Automation Components, Inc.

2305 Pleasant View Road | Middleton, WI 53562
Phone: [phone] | Website: workaci.com

0.98"

(15.49 mm)

NEMA -4X (-4X)

Page 1

3.88"

(98.60 mm)

2.55"

(64.77 mm)

4.72"

(119.83 mm)

3.70"

(93.980 mm)

2.19"

(55.69 mm)

Version: 2.0

I0000810

MOUNTING (Continued)

FIGURE 2: DUCT MOUNTING

Now fasten and insert (2) screws #8 x 3/4" TEK
(provided and recommended) through the
mounting holes in the ange and tighten until
the unit is held rmly to the duct. Make sure the
foam pad is tight to the duct to eliminate any

0.375"

(9.525 mm)

possible air leaks. Refer to the Wiring Instruc-

tions (p. 2-3) to make necessary connections.

Note: All enclosures have the foam pad attached.

For the “DO” (no enclosure), the foam pad is
included, but not installed. The foam pad must be
installed prior to mounting.

FIGURE 3: MOUNTING FOR DIFFERENT CONFIGURATIONS

1.54"

1.51"

(38.25 mm)

(76.51 mm)

3.01"

(39.12 mm)

(78.23 mm)

3.08"

-PB -GD -BB -4X -DO

1.59"

(40.39 mm)

(80.77 mm)

3.18"

1.54"

(39.12 mm)

3.08"

(78.23 mm)

1.54"

(39.12 mm)

(78.23 mm)

3.08"

WIRING INSTRUCTIONS

Open the cover of the enclosure. ACI recommends 16 to 26 AWG twisted pair wires or shielded cable for all
sensors. Signal wiring must be run separate from low and high voltage wires (24/120/230VAC). All ACI thermis­tors and RTD temperature sensors are both non-polarity and non-position sensitive. All thermistor type units
are supplied with (2) ying lead wires, and all RTD’s are supplied with (2) or (3) ying lead wires – see FIGURE

4 (below). The number of wires needed depends on the application.

FIGURE 4: TEMPERATURE WIRING

3-WIRE RTD WIRING2-WIRE THERMISTOR or RTD WIRING

THERMISTOR OR

RTD 2WIRE

Automation Components, Inc.

2305 Pleasant View Road | Middleton, WI 53562

Phone: [phone] | Website: workaci.com

WIRE NUT

WIRING FROM CONTROLLER

ANALOG INPUT

Page 2

RTD 3WIRE

SAME COLOR WIRES

WIRE NUT

WIRING FROM CONTROLLER

ANALOG INPUT

Version: 2.0

I0000810