ACI-Automation Components Temperature Sensors Instruction Sheet

Wiring Diagram For All 2-Wire

Resistive Room Temperature Sensors

Sensor Output to Controller Sensor Output to

Controller

C SENSOR 2

S1

Sensor

3W - +

Wiring Diagram For All

ACI/100-3W-R and ACI/1000-3W-R

Sensor Output to Controller Sensor Output to
(Common to 3W) Controller

C SENSOR 2

Sensor Output to
Controller (Common to -)

S1

Sensor

3W - +

Wiring Diagram For ACI/592-R

Sensor Output to Controller (uA) +15 VDC Supply

Voltage

C SENSOR 2

S1

Sensor

3W - +

Wiring Diagram For ACI/592-10K -R

+VDC Sensor Output to

+15 VDC Supply

Controller r

Voltage

C SENSOR 2

Power Supply or

Controller (GND)

S1

Sensor

3W - +

Installation and Operation Instructions

Temperature Sensors

READ THESE INSTRUCTIONS BEFORE YOU BEGIN INSTALLATION

All ACI thermistors and RTD temperature sensors are both non-polarity and non-position sensitive. ACI Recommends the use
of 18 to 20 AWG twisted pair wire or shielded cable for all sensor installations.

TROUBLESHOOTING

Sensor reads 0 ohms or very low
Sensor reads infinity or very high
Erratic readings
No Voltage or Current Output
No Voltage Signal Output (592-10K)

No Current Signal Output (592)

Sensor or wires are shorted together
Sensor or wires are open
Bad wire connections - Condensation or Moisture problem
Check Power Supply Voltage
Touch sensor and verify that the voltage output increases with
Voltmeter from (-) to (3W) Terminal (Reading in VDC)

Measure Current output changes from (-) to Controllers Input Terminal

(Reading in uA)

ROOM TEMPERATURE SENSORS

All thermistor type room units are supplied with a two-pole terminal block and all RTD's and 592 temperature sensors will be
supplied with either a two or three-pole screw terminal block. This unit is suitable for either drywall mounting or junction box
mounting. The room sensor is provided with screw terminal blocks for all connections. Remove the cover from the unit and
mount the housing base to the wall using the (2) 6/32" x 1" machine screws. Replace the cover and tighten down, using the (2)
1/16" Allen Screws located on the bottom of the enclosure.

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Figure #1



DUCT AND DUCT AVERAGING SENSORS

Duct temperature sensors - drill a 3/8" hole in the duct and insert the probe through the hole until the foam pad is tight to
the duct. Now insert (2) screws through the mounting holes in flange and tighten them until the unit is held firmly to the
duct.
Duct Averaging sensors - Drill a 3/8" hole in the duct and insert the averaging element through the hole until the foam pad is
tight to the duct. Now insert the (2) screws through the holes in the mounting flange and tighten until the unit is held
firmly to the duct. The sensor should then be strung in a crisscross pattern throughout the duct (see Figure #2) using the
mounting clips provided, in a pattern that covers the greatest surface area of the duct, to insure that there is no stratification.
When bending the copper tubing, be careful that you use a gradual bend and that you DO Not kink the copper tubing.

= Mounting Clips

Figure #2

8,’ 12,’ or 24’ Averaging
Element

FLUID IMMERSION TEMPERATURE SENSORS

The ACI Fluid Immersion-type sensors are provided with a 2 ½", 4", or 6 ¼" insertion length, 304 series stainless steel
thermowell. The thermowell has a 1/2" NPT external or process thread and a 1/2" NPT internal or instrument thread. Heat
transfer compound may be used but it is not necessary.

STRAP-ON TEMPERATURE SENSORS

The ACI Strap-On sensors, are provided in a NEMA 1 rated junction box with an adjustable 2" to 5" pipe clamp. The unit
should be mounted on the bottom side of the pipe to ensure proper heat transfer and a true temperature reading. Heat
transfer compound and insulating the sensor will help the overall accuracy of the sensor. By ordering extra straps, and
fastening them together, it is possible to make them fit larger pipes.

OUTSIDE AIR TEMPERATURE SENSORS

The ACI Outdoor Air temperature sensors are provided in a weatherproof enclosure. An optional weatherproof Aluminum
Bell Box or NEMA 4X Polycarbonate enclosure is also available upon request for an additional charge. All of the mounting
hardware is provided with the sensor. Be sure to mount the sensor out of direct sunlight, with the sensor probe pointing
downward.

STAINLESS PLATE TEMPERATURE SENSORS

The ACI Stainless Plate temperature sensors are mounted on the back of a 1 Gang stainless steel plate. The foam pad will
insulate the sensor from any drafts in the wall. (2) 6/32" x 1" machine screws are provided for junction box mounting.
Be sure that the sensor is not mounted on an outside wall, due to the extreme temperature changes from either drafts or heat
transfer.

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Version : 5.0