ACI-Automation Components BACnet OUTSIDE SERIES Installation Instructions

BACnet OUTSIDE SERIES

Installation & Operation Instructions

GENERAL INFORMATION

The BACnet Outside Series sensor is designed for use with

electronic controllers in commercial heating and cooling

building management systems. The ACI BACnet Immersion

Series sensor can be ordered to monitor temperature, RH,

or temp/RH of outside environments. It uses BACnet MS/TP

for physical connection to a BAS or controller, has dip switch-

es to set addresses and baud rate, and has on board

end-of-line termination. There is no analog output.

WIRING INSTRUCTIONS

The BACnet Outside 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 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.

PRECAUTIONS

• DO NOT RUN THE WIRING IN ANY CONDUIT WITH

LINE VOLTAGE (24/120/230 VAC).

FIGURE 1: ENCLOSURE DIMENSIONS

EURO (-EH) ENCLOSURE

3.80"

4.30"

(109.22 mm)

PROBE 4.70”: TEMP. ONLY

2.12"

(53.72 mm)

PROBE 3.00”: RH and RH/TEMP.

2.12"

(53.72 mm)

(96.56 mm)

(119.46 mm)

3.00"

(76.20 mm)

4.70"

1.90"

(48.28 mm)

• Remove power before wiring. Never connect or

disconnect wiring with power applied.

• It is recommended you use an isolated UL-listed

class 2 transformer when powering the unit with
24 VAC. Failure to wire the devices with the correct
polarity when sharing transformers may result in
damage to any device powered by the shared
transformer.

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PRECAUTIONS

(Continued)

• If the 24 VDC or 24VAC power is shared with devices
that have coils such as relays, solenoids, or other
inductors, each coil must have an MOV, DC/AC Transorb,
Transient Voltage Suppressor (ACI Part: 142583), or
diode placed across the coil or inductor. The cathode, or
banded side of the DC Transorb or diode, connects to
the positive side of the power supply. Without these
snubbers, coils produce very large voltage spikes when
de-energizing that can cause malfunction or
destruction of electronic circuits.

MOUNTING INSTRUCTIONS

For optimal readings, follow these tips:

• Mount in shade on North side of the structure to

minimize sun exposure. In the Southern hemisphere

the South side of the building is where the sensor

should be mounted.

• Mount at least 1’-2’ (0.3-0.6 m) below eave to prevent

thermal radiation from aecting performance – see

FIGURE 2.

• Mount at least 4’ (1.22 m) above ground to prevent

thermal radiation rising up aecting performance.

• The plastic tube that houses the sensor must be

pointed down to avoid debris, water, or ice

potentially aecting sensor performance.

• Avoid mounting to chimney walls, above windows,

above vents, near doors, or dampers.

FIGURE 2: MOUNTING LOCATIONS

Roof

Recommended 1-2 ft

(0.3-0.6 m) Below Eave

Install Sensor

Downward

Ground

FIGURE 3: LAYOUT

TERMINAL BLOCKS

V D-GN

POWER

23618421421

4
6

ADDRESS BAUD

D+

BACNET

RESET BUTTON

LED

END OF LINE
TERMINATION

DIP SWITCH

EN DIS

Remove the cover from the housing by turrning counter

clockwise. Attach the base directly to the wall. Mounting

holes are located at the bottom of the housing – see

FIGURE 1. Drill pilot holes for the mounting screws. Use the

enclosure mounting holes as a guide, or use the dimensions

listed above to measure out.

Install the PG11 watertight tting supplied with the sensor if not

using conduit. The outer knockout ring (PG 11/16) on housing

should not be removed when using a ½” NPT conduit tting. Take

TABLE 1: WIRING CONNECTIONS

TERMINAL BLOCKS

+V

GN

D-

D+

CONNECTIONS

Power Supply Positive 12-36VDC / 24 VAC

Power Supply Common or Ground

EIA-485 Data Negative

EIA-485 Data Positive

care when mounting. Sensors should not be placed in

direct sunlight, or any other potential heating or cooling sources that could aect temperature being sensed.

Refer to the wiring instructions below to make necessary connections. After wiring, tighten the -EH cover clockwise onto the enclosure.
Conrm gasketed cover is fastened securely in order to prevent any moisture being introduced into housing.

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