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Installation and Operation Instructions
ACI/TUC Room Unit
PLEASE READ INSTRUCTIONS CAREFULLY BEFORE INSTALLATION!
GENERAL INFORMATION • FAILURE TO WIRE DEVICES WITH THE
CORRECT POLARITY WHEN USING A
SHARED TRANSFORMER MAY RESULT IN
DAMAGE TO ANY DEVICE POWERED BY
THE SHARED TRANSFORMER.
The ACI/TUC Room Unit is factory-configured to
support your specific requirements.
CAUTION
• CHECK THAT THE ACI/TUC ROOM UNIT IS
CORRECTLY CONFIGURED FOR YOUR
APPLICATION; CONTACT ACI IF YOU ARE
UNSURE.
WIRING INSTRUCTIONS
The number of wires needed depends on the application,
with 4 wires minimum and 8 wires maximum required
to support the functions of the ACI/TUC Room Unit.
Generally, one wire is required for each function, one
wire for power, and one wire for ground. All functions
are common ground referenced. ACI recommends 16-
22 AWG twisted pair wires or shielded cable for all
sensor installations. Be sure to connect the cable
shield to the ground at the controller ONLY.
• THE ACI/TUC ROOM UNIT IS A PRECISION
INSTRUMENT; PLEASE HANDLE IT WITH
CARE!
MOUNTING INSTRUCTIONS
Separate the cover from the base. If your application
includes a communications jack, please refer to the
communications wiring instructions document before
mounting the base. Attach the base directly to drywall,
or to a standard 2” x 4” junction box using the mounting
hardware provided. Refer to the wiring instructions to
make the necessary connections. After wiring, attach
the cover to the base and turn the (2) hex-screws at the
bottom of the base until the cover cannot be removed.
WIRING DIAGRAM
FAN
Fan speed signal to controller.
OR
Override signal to controller. See notes.
SET
Setpoint temperature signal to controller.
SEN
Temperature sensor signal to controller.
COM (-)
Ground or signal common, 24Vac (-).
OFB
Occupied feedback signal from controller.
AUX
Auxiliary signal to controller.
POWER (+)
+15 to +30VDC, or 24Vac (+). See notes.
WARNING
• REMOVE POWER BEFORE WIRING!
NEVER CONNECT OR DISCONNECT
WIRING WITH POWER APPLIED. DO NOT
ALLOW LIVE WIRES TO TOUCH THE
CIRCUIT BOARD!
CAUTION
• DO NOT RUN THE ACI/TUC ROOM UNIT
WIRING IN ANY CONDUIT WITH LINE
POWERED WIRING.
NOTES:
• IF THE ACI/TUC ROOM UNIT IS POWERED
BY 24VAC, THE 24VAC POWER AND
GROUND WIRES SHOULD BE RUN IN A
SEPARATE CABLE FROM SIGNAL WIRES.
SEPARATE THE POWER CABLE FROM THE
SIGNAL CABLE BY AT LEAST 6 INCHES
ALONG THE ENTIRE WIRING RUN.
1. Override may be factory configured to function on the SEN or SET terminals to
eliminate the need for a wire jumper between terminals OR and the SEN or the
SET outputs.
2. If your ACI/TUC Room Unit has any output configured as 0-10V, 2-10V,
0-20mA, or 4-20mA, the voltage at the POWER (+) terminal must be at least
+18VDC.
3. If your ACI/TUC Room Unit is configured for +5VDC operation, apply a DC
voltage within the range of +4.75VDC to +5.25VDC to the POWER (+) terminal;
any voltage outside this range may damage the ACI/TUC Room Unit or cause
improper operation.
• ACI RECOMMENDS USING AN ISOLATION
TRANSFORMER WHEN POWERING THE
ACI/TUC ROOM UNIT WITH 24VAC!
4. Units configured with the fan speed option will have terminals for the FAN and
AUX signals. Units without the fan speed option will not have terminals loaded at
these locations.
2305 Pleasant View Rd. ●Middleton Industrial Park ●Middleton, WI 53562
PHONE (608) 831-2585 ●FAX (608) 831-7407
A030306-22 REV 4 4/29/2004 Page 1 of 2
A
C
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utomation
omponents
nc.
Installation and Operation Instructions
ACI/TUC Room Unit
KEY PAD
The ACI/TUC Room Unit has three keypad layouts: 2-
keys including UP and DOWN, 3-keys including UP,
DOWN, and OVERRIDE, and 4-keys including UP,
DOWN, OVERRIDE, and MODE. If your ACI/TUC
Room Unit has the MODE key, please note that the UP
and DOWN keys perform different functions depending
on the mode of operation. Refer to the fan control
option instructions (A030306-47) for details.
O/R
MODE
O/R KEY (OPTIONAL):
Override key.
DOWN KEY:
Setpoint temperature adjust key. Also, fan
speed adjust key on units equipped with the
fan control option.
UP KEY:
Setpoint temperature adjust key. Also, fan
speed adjust key on units equipped with the
fan control option.
MODE KEY (OPTIONAL):
Puts the ACI/TUC Room Unit into fan
speed adjust mode on units equipped
with the fan control option.
DISPLAY
The ACI/TUC Room Unit display response depends on
the configuration of your unit and the mode of
operation.
Setpoint
Hi
Med
Low
Auto
Occupied
On
Fan Off
°F °C
.5
ACI/TUC Room Unit Display
Icons indicate the current status of the
ACI/TUC Room Unit.
The ACI/TUC Room Unit displays
the room temperature and setpoint on
the large 7-segment digits, while the
optional fan speed and other status
information is displayed using icons.
OPERATION
The following diagrams show the operational modes of
the ACI/TUC Room Unit.
Occupied
°F
.5 Optional occupied indication from
controller.
Normally, the ACI/TUC Room Unit shows
the room temperature. The ACI/TUC
Room Unit returns to this screen 5 seconds
after the last key-press activity.
Room temperature display
Setpoint
°F
Setpoint temperature display
When the UP or DOWN keys are pressed,
the ACI/TUC Room Unit shows the
current setpoint temperature.
Temperature setpoint icon.
SETPOINT TEMPERATURE DISPLAY
OPERATION
The ACI/TUC Room Unit normally displays the room
temperature. When the UP or DOWN key is pressed,
the word “Setpoint” appears and the current setpoint
temperature is displayed. Additional UP or DOWN key
presses increment or decrement the setpoint
temperature, while continuously depressing the UP or
DOWN key auto-increments or auto-decrements the
setpoint temperature. The display continues to show the
current setpoint temperature for 5 seconds after the last
UP or DOWN key press and then returns to the room
temperature display.
2305 Pleasant View Rd. ●Middleton Industrial Park ●Middleton, WI 53562
PHONE (608) 831-2585 ●FAX (608) 831-7407
A030306-22 REV 4 4/29/2004 Page 2 of 2
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